MT-3 RADIO SYSTEMS VHF TRANSMITTER INSTRUCTION MANUAL VT-3 132 - 174 MHz Covers model: VT-3/140-SWA2, VT-3/160-SWA2 VT-3/140-SWA8, VT-3/160-SWA8 VT-3/140-SNA2, VT-3/160-SNA2 VT-3/140-SNA8, VT-3/160-SNA8 Copyright © 1998 Daniels Electronics Ltd. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of Daniels Electronics Ltd.
NOTE: The user's authority to operate this equipment could be revoked through any changes or modifications not expressly approved by Daniels Electronics Ltd. The design of this equipment is subject to change due to continuous development. This equipment may incorporate minor changes in detail from the information contained in this manual.
TABLE OF CONTENTS Page 1 GENERAL................................................................................................................. 1-1 1.1 Introduction .................................................................................................... 1-1 1.2 Manual Organization ...................................................................................... 1-1 1.3 VT-3 132 - 174 MHz Transmitter Family Models.......................................... 1-2 1.
RF Exposure Warning This transmitting equipment conforms to SAR (Specific Absorption Rate) limits regarding exposure of human beings to radio frequency electromagnetic energy, as defined in the following national and international standards and guidelines: 1. Industry Canada Radio Standards Specification 102 (RSS-102), Evaluation Procedure for Mobile and Portable Radio Transmitters with respect to Health Canada’s Safety Code 6 for Exposure of Humans to Radio Frequency Fields; 2.
1 GENERAL 1.1 Introduction The VT-3 132 - 174 MHz Transmitter is a low power, synthesized FM transmitter capable of operating in 12.5 kHz or 25/30 kHz channels. The transmitter operates continuous duty in one of two frequency bands: 132 to 150 MHz or 150 to 174 MHz and its output power is continuously adjustable from 0.5 T0 2.0 or 2.0 to 8.0 Watts.
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz : The amplifier module provides the final stages of RF power amplification and harmonic filtering for the transmitter. This manual is intended primarily as a reference since the amplifier module is adjusted at the factory. Enhanced Synthesizer Instruction Manual OS(R/T)-3(A/H) 132 - 470 MHz: This manual pertains to the enhanced synthesizer module.
1.4 Performance Specifications invisible text 1.4.1 General The following is a general set of specifications for the generic VT-3/150 transmitter. Additional specifications, specific to individual modules may be found in their respective submanuals. Type: MT-3 Series Transmitter. Family: VT-3/150. Compatibility: MT-2 Series and MT-3 Series Radio Systems. Frequency Range: 132 to 174 MHz. RF Power Output: Adjustable: 0.5 to 2.0 W and 2.0 to 8.0 W.
PTT Activation: • Active to ground with or without time-out-timer; • Microphone activated with or without time-outtimer; • Front Panel switch: KEY TX - without time-outtimer; • NORM - with or without time-out-timer. • Isolated (optional relay) with or without time-outtimer. PTT Time-Out-Timer: Selectable from 1 sec. to 8 hrs. (factory set 5 min.). 1.4.2 Audio Specifications Audio Input: Balanced 600 ohm or unbalanced (optional). Input level sensitivity, -25 dBm to 0 dBm.
1.4.3 Physical Specifications Physical Dimensions: Width: Height: Depth: 7.1 cm (2.8 in) 12.8 cm (5.05 in) 19 cm (7.5 in) Module Weight: 1.5 kg (3.3 lbs) Corrosion Prevention: Anodized aluminum construction. Stainless steel hardware. Selectively conformal coated glass epoxy 2 and 4 layer printed circuitboards. Gold plated module connectors. Module Design: Compact Eurostandard modular design. Plug-in modules mate with Daniels standard M3 repeater subrack.
2 SYSTEM OVERVIEW 2.1 Transmitter Operation Several modules are integrated by the VT-3 Transmitter Main board to provide the complete transmitter. The Transmitter Main Board, Front Panel Board and Audio Processor are generic in that they apply to all transmitter models. The Front Panel Board and Audio Processor are soldered directly to the Transmitter Main Board and are treated collectively in the Transmitter Main Board Manual.
• MODE 2: Jumper J6 in, jumper J7 in the 'y' position, jumper J18 in the 'x' position - the audio processor is switched by a PTT signal - the synthesizer module is enabled all of the time - standby current: Typically 65 mA - start-up time: Typically 25 ms • MODE 3: Jumper J6 in, jumper J7 in the 'x' position, jumper J18 in the 'y' position - the audio processor is enabled all of the time - the synthesizer module is switched by a PTT signal - standby current: Synthesized - not used in this mode - start-up ti
2.2 Frequency Selection invisible text 2.2.1 Synthesizer Transmitter Eight backplane connections are used to communicate with the synthesizer unit. Pins D28, D30, and D32 are used (in house) to program the synthesizer. Channel select lines (pins D20, D22, D24, and D26) are used once the synthesizer is programmed to select one of 16 channels.
A channel can be selected from a set of 15 (maximum possible) factory programmed channels by the four channel select lines available at the rear 'F' connector on the Transmitter Main Board. A single user selectable channel is set by switches located on the Transmitter Main Board. See the Transmitter Main Board Manual for details. 2.3 Transmitter Assembly and Adjustment All modules are mounted on the Transmitter Main Board which then forms a single assembly.
2.3.2 Frequency Change The transmitter is initially aligned at the factory for the frequency stamped on the 'Factory Set Operating Frequency' label (see section 3.1). This label should list the frequency at which the last complete transmitter alignment was performed. For a small frequency change, a simple channel change (see section 2.2) may be all that is required. A larger frequency change may involve the realignment of other modules.
2.3.4 Deviation Setting The transmitter maximum deviation range is set by jumpers at the factory to ± 5.0 kHz for the VT-3 132 - 174 MHz transmitter. However, under some conditions such as a large change in transmitter operating frequency, the deviation control may need adjustment. The transmitter deviation is dependent on the operating frequency and this dependency is likely to be more severe at the band edges. For frequency changes exceeding ± 0.
2.5 Repair Note The transmitter is mainly made up of surface mount devices which should not be removed or replaced using an ordinary soldering iron. Removal and replacement of surface mount components should be performed only with specifically designed surface mount rework and repair stations complete with ElectroStatic Dissipative (ESD) protection. When removing Surface Mount Solder Jumpers, it is recommended to use solder braid in place of manual vacuum type desoldering tools when removing jumpers.
3 ILLUSTRATIONS 3.1 MT-3 Transmitter Front Panel TRANSMITTER FACTORY SET OPERATING FREQUENCY FREQUENCY (MHz) 160.00000 33.25000 TRANSMIT INDICATOR LED TX ON / OFF SWITCH NORM OFF KEY TX MICROPHONE CONNECTOR MIC RF OUT REFERENCE TYPE N RF OUTPUT JACK SMA REFERENCE INPUT JACK INPUT RED TEXT MADE IN CANADA MADE IN CANADA VT-3/160-SWA8 TRANSMITTER MODEL IDENTIFIER VT3150M1 TM DANIELS ELECTRONICS LTD.
3.2 MT-3 Transmitter Case - Exploded View B A B B A B 3 FINGER GASKET (2) A MT3TXM2B A Instructions 1. Remove the four screws (A) in the Front panel. 2. Remove the four screws (B) on the side of the Transmitter Case.
4 PARTS LIST Description Part No. Qty.
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5 REVISION HISTORY ISSUE DATE DESCRIPTION AND (REASON) 3 • Manual formatted to modular style. All previous revision history in issue 2.
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MT-3 RADIO SYSTEMS TRANSMITTER MAIN BOARD INSTRUCTION MANUAL Covers: Version 1.7 of the Transmitter Main Board Version 1.6 & 1.8 of the FM Audio Processor Board Copyright © 1998 Daniels Electronics Ltd. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of Daniels Electronics Ltd.
NOTE: The user's authority to operate this equipment could be revoked through any changes or modifications not expressly approved by Daniels Electronics Ltd. The design of this equipment is subject to change due to continuous development. This equipment may incorporate minor changes in detail from the information contained in this manual.
TABLE OF CONTENTS Page 1 GENERAL...................................................................................................................1-1 1.1 Introduction ....................................................................................................1-1 1.2 Performance Specifications.............................................................................1-1 1.2.1 General...............................................................................................1-1 1.2.
2.4.1 General...............................................................................................2-12 2.4.2 Power Requirements...........................................................................2-12 2.4.3 Audio Processor Turn-on Time ..........................................................2-13 2.4.4 Audio Processor Signals.....................................................................2-13 2.4.4.1 Audio Processor Outputs........................................................2-13 2.
5.2.1 Transmitter Main Board Top Side Component Layout.......................5-3 5.2.2 Transmitter Main Board Bottom Side Component Layout..................5-4 5.2.3 Transmitter Main Board Schematic Diagram......................................5-5 5.3 Front Panel Board...........................................................................................5-6 5.3.1 Front Panel Board Component Layout...............................................5-6 5.3.2 Front Panel Board Schematic........................
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1 GENERAL invisible text 1.1 Introduction The MT-3 Transmitter Main Board integrates the MT-3 Front Panel Board, MT-3 Audio Processor, Synthesizer or Crystal Controlled Oscillator module, and Amplifier module together to comprise a MT-3 series transmitter (see section 5.1: MT-3 Transmitter Block Diagram).
1.2.2 Audio Specifications Audio Input: Balanced 600 ohm or unbalanced (optional). Input level sensitivity, -25 dBm to 0 dBm. Audio Response: Pre-emphasis (6 dB per octave); +0.5 to -2.0 dB from 300 Hz to 3 kHz; Flat Audio Response: +1 to -1 dB from 100 Hz to 3 kHz. Audio Deviation: Preset to ±1.5 kHz (Narrow Band) or ±3.0 kHz (Wide Band) with a 1 kHz tone (capable ±2.5 kHz or ±5.0 kHz). Subtone Audio Input 1: 0.5 Vpp at 200 Hz for ±500 Hz deviation (internally adjustable).
2 THEORY OF OPERATION invisible text 2.1 Transmitter Main Board invisible text 2.1.1 General Switch SW1 on the Front Panel Board is a DPDT switch which controls the operation of the transmitter (refer to the operations section of the Transmitter Manual). When SW1 is in the 'OFF' position the transmitter is turned off; however, +13.8 Vdc is still present on the Transmitter Main Board as the +13.8 Vdc supply is not switched. When SW1 is in the 'KEYED' position, +9.
2.1.2.2 PTT With Time-Out-Timer Pins B10 and Z10 of the backplane connector are the PTT WTO input. When the PTT WTO signal, which is normally high, falls below +2.0 Vdc, the transmitter is keyed. The transmitter is disabled when the PTT WTO input rises above +2.3 Vdc or if the TOT's time-out period is exceeded. If the time-out period is exceeded the PTT WTO input must go high (>+2.3 Vdc) and then low again in order to rekey the transmitter. The PTT WTO threshold of approximately +2 Vdc (0.
To configure the isolated input for PTT NTO operation jumpers J2, J3, and J4, must be in the 'x' position. In this mode, pins B14 and Z14 no longer function as the PTT NTO input; however, pins B10 and Z10 continue to function as the normal PTT WTO input. 2.1.2.5 PTT Output Pin B24 on the backplane connector is an open drain output (Q9) which is pulled low anytime the transmitter is keyed and the synthesizer is locked.
intended only as a guideline. Refer to the instruction manual for the transmitter that came with your system for specifications.
Z18 by a transformer (T1). Two audio outputs from the MT-3 Audio Processor are routed to the synthesizer or crystal control oscillator modules. 2.1.3.1 Microphone Audio Normally the audio from a transmitter's microphone is transmitted by that transmitter; however, the Transmitter Main Board can be configured by the MIC IN and MIC OUT lines so that the audio from an external microphone modulates transmitter.
2.1.4.2 Crystal Controlled Transmitter The OC-3 Crystal Control Oscillator module is a direct replacement for the synthesizer module and therefore uses the same connections as the synthesizer to connects to the MT-3 Transmitter Main Board. The channel select lines and switches FSW1 to FSW4 are not used by the crystal control module as the transmitter's operating frequency is determined by the Crystal Control Oscillator module's crystal frequency.
The time-out duration is jumper selectable from 1 second to 8 hours. The positions of the jumpers on the top (Through hole component) side of the Transmitter Main Board. Table 2-1 shows the time-out duration in minutes for the various jumper settings which are listed as enabled (E: jumper shorted - in) or disabled (D: jumper left open - out). The standard factory setting of 5 minutes is shown in bold type in table 2-2.
2.2 MT-3 Front Panel Board The MT-3 Front Panel Board is a subsection of the MT-3 Transmitter Board which is used to mount the front panel switch, diode, and microphone connector. The main purpose of the board is to eliminate a wiring harness for the front panel components. Jumper J1, located on the rear of the circuitboard, is used to select whether or not the MIC PTT line activates the transmitter's TOT. Jumper J2 is used to select whether or not Rx Audio or 13.
Table 2-1 MT-3 Audio Processor Current Consumption. Function Current Draw keyed / unkeyed Switched Audio Standby Both Microphone and Balanced Input enabled 29.0 / 0.5 mA Only Microphone or Balanced Input enabled 17.5 / 0.5 mA Only Auxiliary Input enabled 6.0 / 0.5 mA Continuous Audio Standby Both Microphone and Balanced Input enabled 29.0 / 25.5 mA Only Microphone or Balanced Input enabled 17.5 / 14.0 mA Only Auxiliary Input enabled 6.0 / 2.5 mA 2.3.
2.3.4.2 Audio Processor Modulation Output The Modulation Output port is the output port used by all voice input signals. The voice inputs are combined by summing amplifier U4a which has an associated symmetry control (R14). Op-amp U4a together with U5a provide the limiting action for the audio processor. After the audio signals have been combined and limited, they are filtered by a 6 pole lowpass Butterworth filter (U5b, U5c, and U5d).
2.3.4.5 Audio Processor Microphone Input The microphone input has an automatically gain controlled (AGC) preamplifier whose input level is controlled by R2. The microphone input level control (R2) can accommodate a -25 dBm to 0 dBm input signal. The compression level for the microphone input is adjusted by R8. The microphone input is limited and filtered and is output at the standard modulation output port. 2.3.4.
with the voice signals to be output from the standard Modulation Output port while Subtone 2 is not used. Both subtone inputs have an input level control. 2.3.4.9 Audio Processor Direct Modulation Input The Direct Modulation Input is an extremely versatile input. This port is designed to be used for data signals. Depending on the application, the signal can be amplified, AC or DC coupled and output to the Modulation Output or the Low Frequency / Direct Modulation Output port.
Table 3-1 MT-3 Audio Processor Current Consumption. Function Current Draw keyed / unkeyed Switched Audio Standby Both Microphone and Balanced Input enabled 6.0 / 0.3 mA Only Microphone or Balanced Input enabled 4.5 / 0.3 mA Only Auxiliary Input enabled 3.0 / 0.3 mA Continuous Audio Standby Both Microphone and Balanced Input enabled 6.0 / 3.5 mA Only Microphone or Balanced Input enabled 4.5 / 1.5 mA Only Auxiliary Input enabled 3.0 / 0.5 mA 2.4.
2.4.4.2 Audio Processor Modulation Output The Modulation Output port is the output port used by all voice input signals. The voice inputs are combined by U1, a gain level programmable compandor which is configured as an automatic level control amplifier. Op-amp U4a together with U5a provide the limiting action for the audio processor. After the audio signals have been combined and limited, they are filtered by a 6 pole lowpass Butterworth filter (U5b, U5c, and U5d).
2.4.4.5 Audio Processor Microphone Input The microphone input has an automatically level controlled (ALC) preamplifier U1 whose input level is controlled by R2. The microphone input level control (R2) can accommodate a -25 dBm to 0 dBm input signal. The microphone input is limited and filtered and is output at the standard modulation output port. The microphone input can have a standard 6dB/octave pre-emphasis response or a flat-audio response, jumper JU3 at 'x' and 'y' position respectively. 2.4.4.
2.4.4.9 Audio Processor Direct Modulation Input The Direct Modulation Input is an extremely versatile input. This port is designed to be used for data signals. Depending on the application, the signal can be amplified, AC or DC coupled and output to the Modulation Output or the Low Frequency / Direct Modulation Output port. Please consult the factory for specific jumper settings for your application. 2.
3 TRANSMITTER ALIGNMENT 3.1 General Transmitter alignment is simplified by using an M-3 Subrack, SM-3 System Monitor, and RF extender cable to provide transmitter power and signal interconnection. Alternatively, +9.5 Vdc and +13.8 Vdc may be applied directly to a transmitter module through positive connection for the +9.5 Vdc to pins B6 and Z6, for the +13.8 Vdc to pins B2 and Z2, and negative connection to pins B30, Z30, B32, and Z32. Transmitter balanced audio (600 Ω) is available at pins B18 and Z18.
Radio communications test set : VSWR 3:1 mismatch load: Alignment Tool: Marconi Instruments 2955R JFW 50T-035-3.0:1 Johanson 4192 It is recommended that the radio communications test set be frequency locked to an external reference (WWVH, GPS, Loran C) so that the high stability oscillator may be accurately set to within its ±1 ppm frequency tolerance. 3.
• Jumper J26: • Jumper J27: • Jumper J28: • Jumper J29: • Jumper J31: • Jumper J32: • Jumper J33: • Jumper J34: • Jumper J35: installed not installed not installed installed installed not installed installed installed installed Time-Out-Timer Timing resistor select. Time-Out-Timer Timing resistor select. Time-Out-Timer Timing period output select. Time-Out-Timer Timing period output select. Time-Out-Timer Timing period output select. Time-Out-Timer Timing period output select.
• Jumper JU11: not installed • Jumper JU12: not installed • Jumper JU13: not installed • Jumper JU14: not installed • Jumper JU15: not installed • Jumper JU16: not installed • Jumper JU17: installed • Jumper JU18: not installed • Jumper JU19: 'y'position • Jumper JU20 to JU22: • Jumper JU23: not installed • Jumper JU24: installed • Jumper JU25: installed • Jumper JU26: installed • Jumper JU27: not installed • Jumper JU28: not installed • Jumper JU29: not installed • Jumper JU30: not installed • Jumper JU31:
3.6.2 MT-3 Transmitter Board Test Points TP1: squelched, de-emphasized audio / +13.8 Vdc TP2: microphone audio TP3: microphone PTT WTO; inactive +9.5 Vdc, active 0 Vdc TP4: microphone PTT NTO; inactive +9.5 Vdc, active 0 Vdc TP5: +9.5 Vdc from backplane connector TP6: +9.5 Vdc from front panel board TP7: +9.5 Vdc Switched TP8: Qualified PTT; inactive +9.
To remove the Enhanced Synthesizer or Crystal Controlled Oscillator module, simply remove the center screw from the module lid and pull the module out. The module should be pulled straight out so that the four alignment pins do not bend or damage the circuitboard. The Low Power Synthesizer uses two tabs soldered to the Transmitter Main Board for mounting. No alignment pins are used. As a result care must be taken to ensure the connector pins on the bottom of the Synthesizer are not bent.
4 Turn the transmitter on. 5 Adjust the balance compression level (R38) for compression at ±60% maximum deviation. 6 Set the audio frequency to 2.4 kHz, then adjust the deviation control (R29) for maximum deviation. 7 Reset the modulating frequency to 1 kHz and re-adjust R38 for ±60% maximum deviation. 8 Repeat steps 6 and 7 until both conditions are met. 9 Vary the audio signal from 1 kHz to 3 kHz and measure the positive deviation and then the negative deviation.
17 Apply a 1 kHz tone at -8 dBm to the microphone audio input. Set the microphone compression control (R8) to produce ±60% maximum deviation. Reduce the signal to -10 dBm and adjust the microphone input level control (R2) for ±50% maximum deviation. Remove the signal. 18. Apply a 100 Hz tone at -18 dBm to the subtone 1 input and adjust the subtone 1 level control (R42) to produce ±500 Hz deviation. Remove the signal. 3.
• Jumper JU10: • Jumper JU11: • Jumper JU12: • Jumper JU13: • Jumper JU14: • Jumper JU15: • Jumper JU16: • Jumper JU17: • Jumper JU18: • Jumper JU19: • Jumper JU20: • Jumper JU21: • Jumper JU22: • Jumper JU23: • Jumper JU24: • Jumper JU25: • Jumper JU26: • Jumper JU27: • Jumper JU28: • Jumper JU29: • Jumper JU30: • Jumper JU31: • Jumper JU32: • Jumper JU33: • Jumper JU34: • Jumper JU35: • Jumper JU36: • Jumper JU37: • Jumper JU38: • Jumper JU39: • Jumper JU40: • Jumper JU41: • Jumper JU42: • Jumper JU43: n
3.10 MT-3 Audio Processor Alignment (Version 1.8) invisible text 3.10.1General Verify the standard factory settings for the MT-3 Audio Processor as given in section 3.9.1 before beginning the standard deviation adjustment procedure. If the transmitter's channel frequency changes, the audio processor should be realigned to optimize the transmitter's performance. The schematic diagram for the audio processor is shown in section 5.5.2 and the component layout is shown in section 5.5.1. 3.10.
10 Adjust the balanced input level control (R31) so that the deviation increases until compression is observed. The deviation should be ±1.5 kHz or ±3 kHz for narrowband and wideband channels respectively. 11 Increase the input level (R31) by +20 dBm, it should not increase the deviation more than maximum. This confirms that the AGC action of preamplifier U1 is working. 12 A 2.4 kHz tone at the desired audio input level should produce the maximum deviation.
MT-3 Transmitter (board version 43-920910 through 43-920911) • J6 installed (synthesizer always powered up by +9.5V SWITCHED line). • J7 installed in 'X' position (audio processor always powered up by +9.5VSWITCHED line). • solder a wire from JA4-2 of main board to J51-18 of synthesizer. This connects the subtone output 2 to the synthesizer's phase modulation input. MT-3 Transmitter (board version 43-920912 through 43-920913) • J6 installed (synthesizer always powered up by +9.5V SWITCHED line).
input to the transmitter to be used to gain access to the SUBTONE INPUT 2 which connects to the PHASE MOD IN input of a modified synthesizer. • Make sure J13 and J16 are not installed. Figure 3-1 Transmitter Audio Processor Low Frequency Modulation.
3.11.4Tuning the Transmitter For all MT-3 transmitters, apply a low impedance source of 20-300 Hz to the Direct Modulation input of the transmitter (Pin Z28 of the 48 pin connector) through a 22 uF capacitor, positive terminal connected to pin Z28. A Marconi 2955 works well for this test. Adjust R44 on the audio processor to the fully clockwise position. • Apply a 100 Hz tone at -8 dBm to the Direct Modulation input of the transmitter (Pin Z28 of the 48 pin connector, and key the transmitter.
4 TRANSMITTER INTERCONNECT PIN DEFINITIONS The MT-3 series Transmitter employs a 48 pin Eurostandard connector for interfacing to all transmitter power, audio, and control functions. The following are the MT-3 series Transmitter backplane connections to the M-3 Motherboard.
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LSB MSB 5 5.1 6 5 4 6 5 4 ILLUSTRATIONS AND SCHEMATIC DIAGRAMS 7 8 9 Transmitter Block Diagram 3 2 0 1 7 8 9 6 5 4 3 2 7 8 9 0 1 6 5 4 3 2 7 8 9 0 1 3 2 0 1 BACKPLANE CONNECTOR MT-3 FRONT PANEL BOARD B2 FUSE (OPTIONAL) +9.5V B6 10-17 VOLTS + 13.8 VDC NOMINAL +13.8VDC +9.5 VDC CONTINUOUS Z2 +9.5 VDC RX AUDIO / +13.8V Z6 +9.5V OUTPUT J9 +9.5VDC MIC AUDIO SQL DE-EMP INPUT B20 LED ENA REFERENCE INPUT MIC PTT NTO +9.
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MT-3 AM Transmitter Board Component Layout (Top) R42 OPT J28 J29 J31 J32 J34 J26 J27 5.2.1 J35 MT-3 AM Transmitter Board Electrical Assembly J33 5.2 ENA +9.5V 13.
MT-3 AM Transmitter Main Board Component Layout (Bottom) y LPF34 LPF33 J14 x LPF32 x J13 y J12 Q10 PZT 2222 J9 R26 1k00 C2 1µF + 35V 7 C1 + 10µF 35V ORG BLUE RED LPF35 R25 27k4 BLK xx J15 J15 yy 6 5 4 3 2 y J25 x 1 R41 15K YEL 5.2.2 GND: BLACK R40 10K C10 1 µF LPF31 LPF30 MODULATION INPUT: YELLOW LPF29 LPF28 U4 MMAD1108 LPF27 LPF26 LPF25 U3 MMAD1108 LPF24 + 13.8 VDC: RED C20 + 4.
5.2.3 Transmitter Main Board Schematic Diagram LPF16 B6 TP6 LPF TP5 LPF17 Z6 C3 10uF LPF MT-3 FRONT PANEL BOARD C4 1.0uF 6 5 4 MSD 7 JF2-1 TP1 +9.5V INPUT +9.5V OUTPUT SPARE J9 JF1-2 TP2 RX AUDIO +13.8V LPF22 SQL DE-EMP INPUT B20 FSW2 FSW1 +9.5V CONTINUOUS LPF C10 1.0uF JF1-1 C13 10nF C12 10nF MIC AUDIO GROUND TP4 8 TO ALL 9.5V SUPPLY POINTS JF2-4 JF3-1 9 0 1 13.
5.3 Front Panel Board 5.3.1 Front Panel Board Component Layout Factory Installed Solder Jumper. Solder Jumper On Solder Side Of PCB.
5.3.2 Front Panel Board Schematic Diagram P1 PF3 -1 PF3 -2 PF3 1 SPARE SPARE 2 +13.8V 4 RX MON 8 +13.8V 7 RX AUDIO 6 +9.5V OUT 5 RX MON 4 PF3 -4 MIC PTT 3 MIC INPUT 2 PF3 -3 3 1 PF2 PF2-1 PF2-4 +9.5V IN SW1 F NORM C +9.5V OUT E B D A KE YED D1 LED ENA PF2 -3 MIC PTT NTO PF2 -2 J1 X MIC PTT Y PF1 3 PF1 -3 MIC 3 J2 MIC PTT WTO Y PF1 -2 2 RX AUDIO PF1 -1 1 MIC INPUT PF1 -4 4 4 X 2 1 C1 N/I DE TITLE: DATE.
MT-3 Audio Processor Electrical Assembly- PCB No. 43-911916 5.5 5.5.
5.4.2 Audio Processor Schematic Diagram V1.6 Low Frequency Modulation Configuration Low Freq. Low Freq. Desig Desig JU27X Not Installed Installed JU35Y Not Installed JU27Y JU37 Not Installed JU31 Not Installed Not Installed JU38X Not Installed JU35X Installed JU38Y +8.0V_SWD JU3 C4 100nF MICROPHONE AGC PREAMP R1 604R MICROPHONE INPUT LEVEL CONTROL R2 5k P1 3 3 C6 10nF R3 6k81 C12 680nF C9 100nF 7 U1 SL6270 FB1 5 C5 10nF C11 150pF R5 1k00 C10 + 2.2uF 2 1 R8 100k +8.
5.5 Audio Processor Electrical Assembly (Version 1.8) 5.5.1 Audio Processor Component Layout A 2 C D E F G H I J C4 X Y C30 R32 R5 R33 R45 R35 JU11 Y 100nF 4.7µF JU35 1k50 C11 470k 8k25 JU3 N/I 68k1 C49 C18 R1 R39 X JU10 100nF R4 R53 R44 X 604R C15 R11 R10 R9 C10 10nF 100nF JU16 R15 JU13 JU12 221k C36 R54 10nF 49k9 3k01 N/I 0R0 JU37 Y X 49k9 10nF R90 49k9 49k9 C2 274R 10pF JU40 JU9 C7 R30 R6 X R71 JU42 10k0 JU34 2.2µF R8 R46 JU20 R34 2.
A B C D E F G H I J K L M N O P 1 1 5.5.2 Audio Processor Schematic Diagram V1.8 +8.0V SWD COMPONENT LOCATION TABLE 2 C52 1 4.
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6 PARTS LISTS invisible text 6.1 Transmitter Main Board Parts List invisible text 6.1.1 Transmitter Main Board Electrical Parts List Ref Desig Description Part No. C1 C2 C3 C4 C5 C6, C7 C8 C10 C12- C14 C15 C20 C21, C22 C23 CAP., SM, 10µF TANT., 10%, 35V CAP., SM, 1.0µF TANT., 20%, 35V CAP., SM, 10µF TANT., 20%, 16V CAP., SM, 1.0µF TANT., 20%, 16V CAP., SM, 100nF CER, 0805, X7R CAP., SM, 10nF CER, 0805, X7R, 50V CAP., SM, 100nF CER, 0805, X7R CAP., SM, 10µF CER/2225 50 X7R CAP.
Ref Desig Description Part No. R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11-R13 R14-R16 R17 R18,R19 R20 R21 R22 R23 R24 R25 R26 R28 R29 R30 R31 R32 R33 R34, R35 R36 R37 R38 R39 R40 R41 R42 R43 - R46 R47 RES., SM, 10R0 0805, 1%, 100 ppm RES., SM, 27k4 0805, 1%, 100 ppm RES., SM, 1k00 0805, 1%, 100 ppm RES., SM, 27k4 0805, 1%, 100 ppm RES., SM, 10R0 0805, 1%, 100 ppm RES., SM, 27k4 0805, 1%, 100 ppm RES., SM, 1k00 0805, 1%, 100 ppm RES., SM, 27k4 0805, 1%, 100 ppm RES., SM, 221k 0805, 1%, 100 ppm RES.
6.1.2 Transmitter Main Board Mechanical Parts List Description Part No. Qty. CABLE, SMB-SMB PLUG, RG316,12cm $7910-WP0WP012 CABLE, SMA-SMB PLUG, RG316,15cm CABLE,SMA PL-SMB PL,RG316,11cm $7910-SP0WP015 $7910-SP0WP011 CABLE, SMA PLUG-PLUG, RG316, 19 cm $7910-SP0SP019 1 (Enhanced Synth and Crystal Control) 1 (Low Power Synth) 1 (Reference Input Opt. Enhanced Synth) 1 (Reference Input Opt.
6.1.3 MT-3 Front Panel Board Electrical Parts List Ref Desig Description Part No. D1 LED, RED, 5 mm OD, T-1 3/4 2010-503001RD PF1 PF2 HEADER, 0.1", RA, 2 ROW X 2 PIN HEADER, 0.1", RA, 2 ROW X 2 PIN 5010-H202RA9T 5010-H202RA9T SW1 SWITCH, TOG/DPDT, ON-OFF-ON, PCB/STR 5215-T2031V02 PCB MT-3 TX FRONT PANEL 4321-40921211 6.2 MT-3 Audio Processor Parts List (Version 1.6) invisible text 6.2.1 MT-3 Audio Processor Electrical Parts List (Version 1.6) Ref Desig Description Part No.
Ref Desig Description Part No. C40 C41 C42 C43 C44 C47, C48 C49 C50 C51 C52 C53 C54 - C56 C57 C58 CAP., 1.0µF FILM, MMK5, 10%, 50V CAP., 150nF FILM, MMK5, 10%, 63V CAP., N/I CAP., 4.7nF FILM, MMK5, 10%, 63V CAP., 330nF FILM, MMK5, 10%, 50V CAP., 1.0µF FILM, MMK5, 10%, 50V CAP., SM, 10nF CER,0805,X7R,50V CAP., SM, 4.7µF TANT., 10%, 16V CAP., SM, 100nF CER,0805,X7R,50V CAP., SM, 4.7µF TANT., 10%, 16V CAP., SM, 10nF CER,0805,X7R,50V CAP., SM, 4.7µF TANT., 10%, 16V CAP., 1.0µF FILM, MMK5, 10%, 50V CAP.
R38 R39 R40 R41 R42 R43 R44 R45 R46, R47 R48 R49 R50 R51 R52 R61 R71 R72 R73 R74 R75 R76 R77 R78, R79 R80 R81 R82, R83 R84, R85 R86, R87 R88, R89 R90 POT., SM/4mm SQ, 100k 11T, SIDE ADJUST RES., SM, 221k 0805, 1%, 100ppm RES., SM, 1k50 0805, 1%, 100ppm RES., SM, 11k8 0805, 1%, 100ppm POT., SM/4mm SQ, 5k 11T, SIDE ADJUST RES., SM, 11k8 0805, 1%, 100ppm POT., SM/4mm SQ, 5k 11T, SIDE ADJUST RES., SM, 39k2 0805, 1%, 100ppm RES., SM, 4k53 0805, 1%, 100ppm POT., SM/4mm SQ, 100k 11T, SIDE ADJUST RES.
Ref Desig Description Part No. C11 C12 C15, C17 C18, C20 C21, C22 C23 C24 C25 C26 C27 C30 C35 C36 C37 C38, C39 C41 C43 C44 C45 C46 C47, C48 C49 C50 C51 C52 C53 C54 - C55 CAP., SM, 100nF CER., 0805, X7R, 50V CAP., SM, 1.0nF CER., 0805, X7R, 50V CAP., SM, 10nF CER,0805,X7R,50V CAP., SM, 100nF CER,0805,X7R,50V CAP., 10nF FILM, MMK5, 10%, 63V CAP., 22nF FILM, MMK5, 10%, 63V CAP., 10nF FILM, MMK5, 10%, 63V CAP., 15nF FILM, MMK5, 10%, 63V CAP., 1.0nF FILM, MMK5, 10%, 63V CAP., 33nF FILM, MMK5, 10%, 63V CAP.
Ref Desig Description Part No. R20 R21, R22 R23, R24 R25, R26 R27, R28 R29 R30 R31 R32 R33 R34 R35 R36 R37 R38 R39 R40 R41 R42 R43 R44 R45 R46, R47 R48 R49 R50 R51 R52 R53 R54 R55 R71 R72 R73 R74 R75 R76 R77 R79 R80 R81 R84, R85 R86, R87 R88, R89 R90 RES., SM, 2k21 0805, 1%, 100ppm RES., SM, 49k9 0805, 1%, 100ppm RES., SM, 5k11 0805, 1%, 100ppm RES., SM, 3k48 0805, 1%, 100ppm RES., SM, 13k3 0805, 1%, 100ppm POT., SM/4mm SQ, 50k 11T, SIDE ADJUST RES., SM, 681R 0805, 1%, 100ppm POT.
7 REVISION HISTORY ISSUE DATE REVISION 1 August 97 First Issue. Sept. 97 Included PCB version 1.4 Component Layout and Schematic diagrams. Dec 97 Main PCB version now 1.7 (ECO 515). • BCD Switches changed from Surface Mount Part to Through Hole Part. • Audio Amplifier was removed because this option was never used. • Added Timer Out Timer circuitry to Main Tx Board. • TOT PCB no longer installed on Audio Processor. For A21-TX3-00 TX MAIN/FP, MT-3, STANDARD A21-TX3-30 TX MAIN/FP, MT-3, + REF.
ISSUE DATE REVISION 3 Updated the DE logo and added the statuary trademark statement to the title page. Updated the Low Frequency Modulation section 3.11 to reflect the in house document A0361-06.
MT-3 RADIO SYSTEMS Audio Processor Instruction Manual For AM/FM Transmitters Covers the following V 2.2 and V2.3 of the FM Audio Processor Board used in the VT-3/xxx, UT-3/xxx, VT-3Hxxx and A22-VAP130 AM Audio Processor Version 04 Copyright © 2000 Daniels Electronics Ltd. All rights reserved.
NOTE: The user's authority to operate this equipment could be revoked through any changes or modifications not expressly approved by Daniels Electronics Ltd. The design of this equipment is subject to change due to continuous development. This equipment may incorporate minor changes in detail from the information contained in this manual.
TABLE OF CONTENTS Page 1 FM AUDIO PROCESSOR .............................................................................................1-1 1.1 Introduction ..........................................................................................................1-1 1.2 Block Diagram (FM Audio Processor).................................................................1-3 1.3 FM Audio Processor Board Pin Connections.......................................................1-4 1.4 Factory Configuration.......
9.4 9.5 9.6 9.7 9.8 9.9 9.10 9.11 9.12 10 Audio Circuits.......................................................................................................9-6 Power Requirements .............................................................................................9-6 Transmitter Standby Modes..................................................................................9-6 Audio Circuitry.....................................................................................................
1 FM AUDIO PROCESSOR 1.1 Introduction The MT-3 FM Audio Processor is a versatile circuit board that can provide several types of audio processing for voice or data transmission. The following terms are defined: Table 1 Bandwidth Definition Term Channel Spacing Rated System Deviation Wideband 25 kHz or 30 kHz ±5.00 kHz Narrowband 12.5 kHz or 15 kHz ±2.50 kHz LTR™ is a trademark of E.F. Johnson Co.
A continuous +9.5 VDC supply and a switched +8.0 VDC supply are required to power the module which is normally supplied by the Main Transmitter Board. The 6 audio inputs on the FM Audio Processor are: • • • • • DYNAMIC MICROPHONE INPUT 600 OHM BALANCED INPUT subtone inputs auxiliary input. direct modulation input for data signals. The Audio Processor's balanced input pins are isolated by a transformer (T1) on the Transmitter Main Board.
1.
1.3 FM Audio Processor Board Pin Connections P3 P4 P2 P1 Surface Mount Side PCB 4 2 4 2 4 2 4 2 3 1 3 1 3 1 3 1 END VIEW +9.5V Mic Input +8V -10 dBm Subtone Input 1 Voice And Subtone Output Balanced Input -18 dBm Low Frequency Direct Mod Output 0 dBm -8 dBm Figure 2 Pin Connection Diagram 1.4 Factory Configuration The MT-3 FM Audio Processor is factory configured as follows: Table 2 Parameter Specification Maximum Deviation ±2.5 kHz (Narrowband), ±5.0 kHz (Wideband).
1.5 Turn-on Time This measurement is made with the standard factory settings with a 1 kHz tone applied to the balanced input. The turn-on time is the time it takes the FM Audio Processor to output a stable audio signal to P3-1 from the time its power (+8.0 VDC) is switched on. The turn-on time can be virtually eliminated by configuring the FM Audio Processor for continuous audio standby (see section 1.7 Transmitter Standby Modes).
Notes: If FM Audio Processor JU36 is not installed, both microphone and balanced audio compression amplifiers will be disabled. This means that the front panel microphone jack will be disabled for local microphone operations. When in this condition, balanced audio is routed around the compression circuitry via JU11 (installed) with JU1 and JU2 removed.
2 SIGNALS The MT-3 FM Audio Processor has six audio inputs, two audio outputs and one audio control input. Five of the audio inputs are used primarily for voice and tone signals. The sixth, the Direct modulation input, is used primarily for data signals. The audio control input is used to switch audio outputs so the transmitter can transmit voice or data. 2.
using the lower input levels) Like the microphone input, the balance input is limited and filtered and is output at the standard modulation output port. If no compression is required (i.e.: customer is providing their own), JU11 can be enabled providing a path through R48 (Auxiliary Input Level Control) to amplifier U2C where preemphasis or flat audio can then be selected from its output. 2.6 Auxiliary Input The auxiliary input is a special input and does not have an ALC.
3 THEORY OF OPERATION Voice band audio normally enters the Balanced Input at P1-1 and P1-2 while microphone audio enters at P1-3. Potentiometer R31 sets the Balanced compression level of U1B while R2 sets the microphone compression level of U1A. Each amplifier has a dynamic range of 25 dB. Jumper JU17 is only installed when using very low input levels (-20 to –25 dBm) and allows better tuning range for R31.
The microphone and balanced audio signals are summed and limited by U3A. Op-amp U3B provides audio level temperature compensation (for synthesizer and crystal oscillator sensitivity variations). Due to the many different characteristics of the models of synthesizer and crystal oscillators, the components are marked “SELect” and are identified later in this document (section 6.) 4.0V 4.0V L IMIT ER T EMPE RATUR E COMPE N S ATI O N +8.0V SWD R84 10K0 R85 10K0 C50 4.
If no compression circuitry is required, the balanced input signals can be routed around the compression circuitry by jumper JU11. Op-amp U2C then would provide the buffering/amplification. It’s output would normally have pre-emphasis installed but could be changed to flat if required through jumper JU9. The audio signal is then normally routed to U3A, the summing amplifier/limiter and processed as mentioned in the previous paragraphs.
Voltage regulator U2A provides regulated +4.0V to all Op-amp stages. Optional potentiometer R14 can be installed (and JU15 removed) for special applications which need a voltage different than +4.0V. Data normally enters at P4-3, the Direct Modulation Input. From there, it has many routes that it can go. JU43 allows direct or on-board capacitive coupling. Op-amp U2B can be configured as a buffer with a DC offset to handle input data that has a positive DC voltage offset.
4 ALIGNMENT Verify the standard factory settings for the MT-3 FM Audio Processor as given in section 1 before beginning the standard deviation adjustment procedure. If the transmitter's operating frequency is changed beyond the factory recommended bandwidth or if the synthesizer is changed, the FM Audio Processor should be realigned to optimize the transmitter's performance. The schematic diagram for the FM Audio Processor is shown in section 7-2 of this manual. The settings tolerance is +/- 0.1 kHz. 4.
4.4 Subtone Input Setup • Apply a 100 Hz tone at -18 dBm to the subtone 1 input . • Adjust R42 (SUBTONE INPUT 1) to produce: • ±500 Hz(Wideband) or ±350 Hz(Narrowband) deviation. • Remove the signal. 4.5 Balanced Input Frequency Response • Apply a 1 kHz tone at –18 dBm to the BALANCED INPUT (Transmitter Main Board edge connector pins B18, Z18). • Record deviation and use this level as the 0 dB reference. • Sweep frequency from 100 Hz to 5 kHz.
5 TROUBLESHOOTING - TEST EQUIPMENT NEEDED 1 2 3 4 Variable Power supply/supplies to supply 9.6V and 8.0V at the same time. Digital Voltmeter to measure RMS AC Volts, DC Volts, DC Current and resistance. 20 MHz Oscilloscope, single channel. Audio Signal Generator (600 Ohm Output Impedance) capable of frrequencies from 67 Hz to 5000 Hz. Power Supply • Connect a regulated power supply with +9.5V as follows: Positive to P2-4 Negative to P1-4 (Ground) • Connect a regulated power supply with +8.
5.3 Subtone Input Test Change Audio Generator frequency to 100 Hz and maintain level at –18 dBm (98 mV RMS). Connect output to Subtone Input 1 (P2-2) and ground (P1-4). Refer to Table 8 Waveform Levels, for levels and waveforms that should be present. 5.4 Audio benchmarks Set the audio generator to 2.4 kHz @ 0 dBm at the Balanced Input. Compare the waveform levels with those listed in table below. Repeat for the various audio frequencies and levels and compare with the levels in the table below.
6 TEMPERATURE COMPENSATION The FM Audio Processor includes temperature compensation circuitry to maintain constant transmitter audio deviation with a fixed level input signal. It is capable of not only compensating for temperature related level variations within the FM Audio Processor (typically –0.3 to –0.5 dB at –40C) but can also compensate for changes caused by the synthesizer or crystal oscillator module that is not equipped with its own temperature compensation.
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7 ILLUSTRATIONS, TABLES AND SCHEMATIC DIAGRAMS 7.
COMPONENT LOCATION TABLE 7.2 FM Audio Processor Component Layout V2.3 BOTTOM SIDE P9 P8 JU7 1 R12 N/I JU22 R35 SEL R69 2k00 P10 R67 30k9 JU19 R23 C45 SEL 4.
A B C D E F G H I 1 J K L M N O P 1 R71 5K11 7.3 +8.0V SWD FM Audio Processor Schematic Diagram V2.3 C48 4.7uF +9.5V CONTINUOUS +8.0V SWD C18 100nF 2 R56 0R0 3 4.0V VOLTAGE R14 ADJUST N/I (5K0) 3 Y 2 X 1 C25 1.0uF TP11 R2 5K0 MICROPHONE INPUT P1 3 C1 1.0uF 2 FB1 C35 1.0uF 1 R3 R39 15K4 R59 20K0 U1b SA571D 13 +8.0V SWD P2 3 +9.5V CONTINUOUS P2 6 P1 1 R62 15K4 R3 2 Rect In C9 1.0uF JU17 P1 2 JU1 X 4.0V C15 3.3nF R6 18K2 C51 1.
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8 Ref Desig C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 FM AUDIO PROCESSOR PARTS LIST Description CAP., SM, 1.0uF CER, 1206, X7R, 16V CAP., SM, 1.0uF CER, 1206, X7R, 16V CAP., SM, 4.7uF TANT., 10%, 16V CAP., SM, 1.0uF CER, 1206, X7R, 16V CAP., SM, 10nF CER,0805,X7R,50V CAP., SM, 1.0uF TANT., 20%, 16V CAP., SM, 680nF CER, 1206, X7R, 16V CAP.
Ref Desig C56 Description CAP., SM, 33nF CER, 0805, X7R, 50V Part No. 1008-4A333K5R FB1 FERRITE BEAD, SM, 43MIX,.18x.12 1213-43181200 P1 P2 P3 P4 HEADER HEADER HEADER HEADER 5010-H202RA9T 5010-H202RA9T 5010-H202RA9T 5010-H202RA9T Q1 TRANSISTOR, BC817-25 NPN,SOT23 2120-BC817025 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 R32 R33 R34 R35 R36 R37 R38 R39 R40 R41 R42 R43 R44 R45 R46 R47 RES., SM, 215R 0805, 1%, 100ppm POT.
Ref Desig R48 R49 R50 R51 R52 R53 R54 R55 R56 R57 R58 R59 R60 R61 R62 R63 R64 R65 R66 R67 R68 R69 R70 R71 R72 R73 R74 R75 R76 R77 R78 R79 R80 R81 R82 R83 R84 R85 R86 R87 R88 R89 Description POT., SM, 100K0 4mm SQ, 100K,11T,SIDE RES., SM, 16k2 0805, 1%, 100ppm RES., SM, 49K9 0805, 1%, 100ppm RES., SM, 10K0 0805, 1%, 100ppm RES., SM, 100K 0805, 1%, 100ppm RES., SM, N/I 0805, 1%,100ppm RES., SM, SEL 0805, 1%, 100ppm RES., SM, 49K9 0805, 1%, 100ppm RES., SM, 0R0 0805, 1%, 100ppm RES.
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9 AM AUDIO PROCESSOR 9.1 Introduction The MT-3 AM Transmitter Main Board integrates the MT-3 Front Panel Board, MT-3 AM Audio Processor, Synthesizer or Crystal Control module and Amplifier module together to make a working MT-3 AM series transmitter. The Front Panel Board and the Audio Processor are soldered directly to the Transmitter Main Board while the Amplifier and the Synthesizer or Crystal Control module are frequency band sensitive, plug-in modules.
9.3 Audio Specifications Audio Input: Audio Response: Audio Distortion: 9.4 -30 to 0 dBm into a 600Ω balanced load. Flat audio; +1/-3 dB: 300 Hz - 3 kHz Less than 3% -40˚C to +60˚C at 30% modulation, Less than 5% -40˚C to +60˚C at 90% modulation Audio Circuits All of the audio signal conditioning (e.g. limiting, filtering) is performed by the MT-3 AM Audio Processor. The transmitter board routes the audio lines from the backplane connector to the audio processor.
The actual current and start-up time may depend on the frequncy controlled source (crystal or synthesizer) and amplifier module. The current and start-up times given below are representative values intended only as a guideline.
9.8 AM Audio Processor Factory Configuration The MT-3 AM Transmitter Audio Processor is factory configured as follows: • Microphone Input: modulations. • Audio Balanced Input: modulations. • Automatic Modulation Control • Automatic Level Control 1kHz tone at -10 dBm gives 50% maximum 1 kHz tone at -8 dBm gives 90% maximum enabled enabled The corresponding jumper settings are: • • • • • • • • • 9.
10 Apply a 1 kHz, -8 dBm input signal, the modulation should be 90%, observe that the distortion of the transmitted signal is within 5.0%. 11 Slowly increase the input audio signal level to 5 dBm and observe that the modulation does not go over 100%. This step verifies the correct operation of the ALC . 12 Change 13.8Vdc power supply to 10V and then to 17V, the modulation of the output RF signal should remain at the same level of 90% ±7% and distortion should be less then 3%.
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9.10 AM Audio Processor Electrical Parts List Ref Design C1 C2 C3 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C25 Description CAP., SM, 4.7nF CER., 1206, X7R CAP., 470nF FILM, MMK5,10%,63V CAP., SM, 680nF TANT., 10%, 35V CAP., 470nF FILM, MMK5,10%,63V CAP., SM, 100nF CER., 0805, X7R, 50 CAP., SM, 10nF CER., 0805, X7R CAP., SM, 680nF TANT., 10%, 35V CAP., SM, 4.7uF TANT., 10%, 16V CAP., 470nF FILM, MMK5,10%,63V CAP., SM, 2.2uF TANT., 20%, 20V CAP., SM, 4.7uF TANT., 10%, 16V CAP.
Ref Design R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R13 R14 R15 R16 R17 R18 R19 R20 R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 R32 Description POT., SM, 5K0 4mm SQ, 11T,SIDE RES., SM, 20K0 0805, 1%,100ppm RES., SM, 49K9 0805, 1%,100ppm POT., SM, 50K0 4mm SQ, 50K, 11T,SIDE RES., SM, 30K9 0805, 1%,100ppm RES., SM, 100K0 0805, 1%,100ppm TEMPSISTOR, 1K2 PTC, 10%,AXIAL RES., SM, 4K75 0805, 1%,100ppm RES., SM, 10K0 0805, 1%,100ppm RES., SM, 27K4 0805, 1%,100ppm RES., SM, 27K4 0805, 1%,100ppm RES.
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9.11 AM Audio Processor Component Layout R1 5k0 Microphone Input Level Adjust R4 50k0 Automatic Modulation Control Input Adjust C3 680nF D2 1N5221B R16 5k0 Balanced Input Level Adjust C8 680nF C12 4.7uF D1 1N5221B P8 R14 100k0 Modualtion Control Output Adjust P5 C19 1.0uF U2 MC33174 U1 SA571D P1 1 C2 470nF wo # xxxx C21 4.7uF C11 2.2uF FB 1 P5 3 2 1 4 2 C9 4.7uF P6 P7 P2 3 1 4 2 P3 3 C5 470nF 4 C10 470nF 1 3 2 4 C15 C16 4.7nF 2.
9.12 AM Audio Processor Schematic Diagram 8.0V 8.0V C14 100nF JU9 C6 100nF Automatic Modulatio n C o ntro l R3 49K9 TP5 C15 4.7nF C7 10nF U1a SA571D U2a MC33174 R15 49K9 AM C B yp ass Micropho ne Input Leve l Adjust CW P1 Micropho ne TP1 C2 470nF R2 20K0 Output JU1 7 Y C5 470nF R20 39K2 4 R9 10K0 1 2 Rect In R18 470K0 2 Inv In C13 1.0nF R28 82K5 U2d MC33174 8 C25 150pF R31 15K4 R25 82K5 R14 100K0 Modulation Co ntro l Outpu t Adjust C20 220pF Y C19 1.
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10 REVISION HISTORY ISSUE DATE REVISION 1 2 First Issue. Second Issue Incorporated the AM Audio Processor documentation into this manual.
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DANIELS ELECTRONICS LTD. ® MT-3 RADIO SYSTEMS VHF AMPLIFIER INSTRUCTION MANUAL VT-3 132 - 174 MHz Covers models: VT-3/150 Amplifier Copyright © 1998 Daniels Electronics Ltd. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of Daniels Electronics Ltd. Issue: Issue Date: Printing Date: Part No.
NOTE: The user's authority to operate this equipment could be revoked through any changes or modifications not expressly approved by Daniels Electronics Ltd. The design of this equipment is subject to change due to continuous development. This equipment may incorporate minor changes in detail from the information contained in this manual.
TABLE OF CONTENTS Page 1 GENERAL....................................................................................................................1-1 1.1 Introduction .......................................................................................................1-1 1.2 Performance Specification .................................................................................1-1 2 THEORY OF OPERATION.........................................................................................2-1 2.
5 PARTS LISTS...............................................................................................................5-1 5.1 VT-3/150 Amplifier Electrical Parts List............................................................5-1 5.2 VT-3/150 Low Pass Filter Electrical Parts List ..................................................5-3 5.3 VT-3/150 Amplifier Mechanical Parts List ........................................................5-3 6 REVISION HISTORY.............................................
RF Exposure Warning This transmitting equipment conforms to SAR (Specific Absorption Rate) limits regarding exposure of human beings to radio frequency electromagnetic energy, as defined in the following national and international standards and guidelines: 1. Industry Canada Radio Standards Specification 102 (RSS-102), Evaluation Procedure for Mobile and Portable Radio Transmitters with respect to Health Canada’s Safety Code 6 for Exposure of Humans to Radio Frequency Fields; 2.
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1 GENERAL 1.1 Introduction The VT-3/150 Amplifier provides the final stage of RF amplification and filtering for the entire VHF Transmitter VT-3 132 - 174 MHz family. The amplifier has two distinct frequency ranges: 132 to 150 MHz, and 150 to 174 MHz with continuously adjustable 2.0 to 8.0 Watts output power. The VT-3/150 Amplifier is housed in a machined aluminum case that ensures optimum RF shielding, provides a good ground, and also acts as a heatsink.
Transmitter Mismatch Protection: 20:1 VSWR at all phase angles. Transmitter Alarm: Forward power sense and reverse VSWR; - open collector output (separate or 'OR'ed configuration); -linear output (separate lines only). Operating Temperature Range: -30˚ C to +60˚ C, optional -40˚ C temperature test. Operating Humidity: 95% RH (non-condensing) at +25˚ C. Operating Voltage: +13.8 Vdc Nominal (range +11 to +16 Vdc), +9.5 Vdc Regulated. Transmit Current: 0.7 Amp typical; 1.
2 THEORY OF OPERATION 2.1 Amplifier Operation A power control circuit monitors the RF output power of amplifier U4 and keeps the power constant. The output power from the high power amplifier will change as the unregulated +13.8 Vdc supply varies. Note that the frequency band does not change how the amplifier operates; it only changes a few component values in the RF circuitry. Power for the VT-3/150 Amplifier is provided from the MT-3 Transmitter Board. The +13.
2.3 RF Circuitry The RF circuitry consists of several blocks: a 7 dB input pad (R1, R2, and R3), an RF amplifier module (U4), an output power boosting transistor (Q7), three directional couplers (TL1, TL3, and TL4), and the VT-3/150 Lowpass Filter. The heart of the VT-3/150 Amplifier is RF amplifier module U4. The output of U4 is further amplified by Q1 to a maximum of 8.0 Watts at the antenna connector.
2.5 Power Sensing Circuitry The VT-3/150 Amplifier is equipped with output power and VSWR sensing lines which can be individually configured as open collector or linear outputs. In open collector configuration, the output is active low, that is, when a fail condition is detected (not enough output power or too high antenna VSWR) the open collector transistor is turned on. In linear configuration, a voltage proportional to the sensed output power or antenna VSWR is output.
2.5.3 VSWR Overload The VSWR overload circuit protects the VT-3/150 Amplifier from excessive antenna VSWR by reducing the amplifier's gain (output power) when an overload condition occurs. The VSWR overload circuit (R14, R37, R39, R40, U2a, and Q6) is an extension of the VSWR sense circuit and operates the same as the VSWR sense open collector circuit. The VSWR Overload Adjust potentiometer (R37) reduces the voltage level of the VSWR Alarm Setpoint.
3 VT-3/150 AMPLIFIER ALIGNMENT 3.1 General Connections to the power supply, alarm and transmit enable lines (ENA), are clearly marked on the amplifier case. The amplifier is enabled when the enable line (ENA) is grounded. If the amplifier is installed in the transmitter, alignment is simplified by using an SR-3 Subrack, SM-3 System Monitor, and RF extender cable to provide transmitter power and signal interconnection (see the Transmitter Main Board Manual for details).
It is recommended that the radio communications test set be frequency locked to an external reference (WWVH, GPS, Loran C) so that the high stability oscillator may be accurately set to within its ±1 ppm frequency tolerance. 3.4 Printed Circuitboard Numbering Convention To ease troubleshooting and maintenance procedures, Daniels Electronics Limited has adopted a printed circuitboard (PCB) numbering convention in which the last two digits of the circuitboard number represent the circuitboard version.
3.6.2 VT-3/150 Amplifier Adjustment The Amplifier alignment consists of two adjustment procedures; (i) a general set up (section 3.6.2.1) procedure which sets up the proper bias conditions for the RF transistors and (ii) the RF threshold adjustments which set up the desired alarm threshold levels as well as the RF output power. The general alignment procedure is required following major repair operations, changes in RF input levels or large changes in operating frequency (greater than ± 1.0 MHz).
4. Monitor the +9.5 Vdc and 13.8 Vdc supply current and adjust R7, the output power adjustment, so that approximately 1 Amp is being drawn on the +9.5 Vdc line and 1.3 Amps or less is being drawn on the 13.8 Vdc line. This should produce approximately 8 Watts. 5. If only a 6 or 7 watt output is obtained, adjust the low pass filter coil pairs L2/L3 and L1/L4 to obtain 8 watts. 3.6.2.
3.6.2.3 1. Output Power Turn R7, the output power adjustment, clockwise to the desired transmitter output power. 3.6.2.4 Antenna VSWR Alarm (Reverse Power) Open Collector Output * note: the antenna VSWR alarm output is factory configured as an open collector output so a pull-up resistor may be required on transmitter pin Z26 if one is not already present. The output power alarm must be set first before the antenna VSWR alarm can be set. 1.
3.6.2.5 Antenna VSWR Overload 1. Disconnect the radio communications test set and so that the amplifier is terminated with an open circuit. 2. Monitor the current from the +9.5 Vdc supply. 3. Adjust R37, the VSWR overload adjustment, clockwise until a noticeable drop in the +9.5 Vdc current occurs. 4. Reconnect the radio communications test set and, the +9.5 Vdc current should return to the previous level. 3.6.2.6 Procedure Verification 1. Verify that the current drawn from the +13.
4 ILLUSTRATIONS AND SCHEMATIC DIAGRAMS This Page Intentionally Left Blank DANIELS DEELECTRONICS 4-1 VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
4.1 VT-3/150 VHF Amplifier Component Layout MBZ5233B R37 50K JU3 R21 50K JU4 R36 50K R38 Q5 PZT2222A 1K JU1 R7 50K R25 1K JU2 R6 27K4 R14 10K R4 D1 R5 4K53 C13 100n R8 3K48 10n C14 MMBD701 D7 Q6 10K R41 Q1 IRF9540 R10 10K C12 10nF 27K4 U1 R28 R29 Q3 MC 10K 33172 PZT2222A R9 Q4 R31 10K C17 10n 10K 49K9 BC817-25 C15 10n R11 R12 10K R27 49K9 R30 JU5 49K9 R26 49K9 C39 2.2nF TL5 R39 1K 49K9 C25 150p L2 0.
4.2 VT-3/150 VHF Amplifier Schematic Diagram +13.8 VDC LOW / HIGH BAND FIL5* +13.8 VDC LPF +13.8 VDC C1 1nF R1 30R1 R2 178R R3 178R 2 3 C4 18nF C2 18nF TO ALL SWITCHED +9.5V FIL2 +9.5 VDC LPF S R4 49k9 AMPLIFIER ENABLE I/P C27 100nF FB3* L8 19nH R45 10R 6 5 + L4 150nH L3 180nH R15 49R9 TL2 Q7 MRF262 C33 68pF LB/51pF HB C35 SELECT LB = LOW BAND HB = HIGH BAND FB1 C8 1nF C7 100nF C9 18nF Q1 IRF9540 C10 10nF R7 50k D5 MMBD701 C12 10nF C39 2.
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4.3 VT-3/150 VHF Lowpass Filter Component Layout invisible text 4.
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5 PARTS LISTS 5.1 VT-3/150 Amplifier Electrical Parts List Ref Desig Description Part No. C1 C2-C5 C6 C7 C8 C9 C10 C11 C12 C13 C14, C15 C16 C17 C18 C19 C20 C21-C23 C24 C25 C26 C27 C28 C29 C30 C31 C31 C32 C32 C33 C33 C34 C34 C35 C35 C36 C36 C37 C37 C38 C38 C39 CAP., SM, 1nF CER, 1206, C0G CAP., SM, 18nF CER, 1206, X7R CAP., SM, 4.7µF TANT., 10%, 16V CAP., SM, 100nF CER, 1206, X7R CAP., SM, 1nF CER, 1206, C0G CAP., SM, 18nF CER, 1206, X7R CAP., SM, 10nF CER, 1206, X7R CAP.
Ref Desig Description Part No. FB1 FB2, FB3 FIL1-FIL5 FERRITE BEAD, SM, 43 MIX 1812 PKG FERRITE BEAD, 64MIX 3X3.5mm OD FILTER, EMI PI/5500pF, 8-32 UNC 1213-43181200 1210-64030350 1302-P552D10D J1 J2 CONNECTOR, SMB, JACK,2 HOLE FLANGE CONNECTOR, N JACK PANEL MNT, C/SNK 5120-J2SC01BG 5184-10923011 L1-L3 L4 L5 L6, L7 L8 L9 L10 L11 LPF1 INDUCTOR, SM., 180nH 20%, 1812 CHOKE, RF/MOULD., 150nH 10%, .37 INDUCTOR, SM, 1.5µH 10%, 1812 INDUCTOR, SM, 1.5µH 10%, 1812 COIL, 1.5 TURNS, 18AWG, 3.
Ref Desig Description Part No. R38, R39 R40 R41 R42 R43 R44 R45 RES., SM, 1k00 1206, 1%, 100ppm RES., SM, 221k 1206, 1%, 100ppm RES., SM, 10k0 1206, 1%, 100ppm RES., SM, 1k00 1206, 1%, 100ppm RES., SM, 27k4 1206, 1%, 100ppm RES., SM, 10k0 1206, 1%, 100ppm RES., 10R METAL FILM, 5%, 0.5W 1150-3B1001FP 1150-5B2213FP 1150-4B1002FP 1150-3B1001FP 1150-4B2742FP 1150-4B1002FP 1101-1A0100JP TL1 TL2, TL3 TL5 COAX, DIRECTIONAL COUPLER 0.5" COAX, DIRECTIONAL COUPLER 0.5" COAX, CONFORMABLE 31.5mm, 50 OHM, 0.
Description Part No. Qty. SCREW, M3 X 8, CAP SOCK-M2.5, S/S SCREW, M3 X 8, CAP SOCK-M2.5, S/S SET SCREW, M3 X 3, HEX SOCKET, A2 SHOULDER WASHER, M3 0.24" OD, NYLON 5812-3M0SA08S 5812-3M0SA08S 5817-3M0AC03S 5674-120N2440 3 2 1 1 TUBING, TFE-260C, 22AWG,Thin 5mm TURRET TERMINAL, 4-40 0.
6 REVISION HISTORY ISSUE DATE REVISION 1 Jul 97 First Issue.
ISSUE 6-2 DATE REVISION VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
MT-3 RADIO SYSTEMS ENHANCED AM/FM SYNTHESIZER INSTRUCTION MANUAL OS(R/T)-3(A/H) 29 - 470 MHz Covers models: OST-3H035, OST-3H045, OSR-3H061 OST-3A128, OSR-3A149 OST-3H141, OST-3H162, OSR-3H141, OSR-3H162 OST-3H440, OSR-3H440 Copyright © 2000 Daniels Electronics Ltd. All rights reserved.
NOTE: The user's authority to operate this equipment could be revoked through any changes or modifications not expressly approved by Daniels Electronics Ltd. The design of this equipment is subject to change due to continuous development. The equipment covered by this manual may incorporate minor changes in detail from the information contained in this manual.
TABLE OF CONTENTS Page 1 GENERAL...................................................................................................................1-1 1.1 Introduction ....................................................................................................1-1 1.2 OS(R/T)-3(A/H) Enhanced Synthesizer Family Models ................................1-1 1.3 Performance Specifications.............................................................................1-3 1.
4 ILLUSTRATIONS AND SCHEMATIC DIAGRAMS ..............................................4-1 4.1 OS(R/T)-3H 29 - 71.4 MHz Analog Board Diagrams ...................................4-1 4.1.1 OS(R/T)-3H 29 - 71.4 MHz Analog Board Component Layout (Bottom)4-1 4.1.2 OS(R/T)-3H 29 - 71.4 MHz Analog Board Component Layout (Top) 4-2 4.1.3 OS(R/T)-3H 29 - 71.4 MHz Analog Board Schematic Diagram........4-3 4.2 OS(R/T)-3A 118 - 159.4 MHz Analog Board Diagrams................................4-5 4.2.1 OS(R/T)-3A 118 - 159.
1. GENERAL This is hidden text. 1.1 Introduction The OS-3A/H Synthesizer is a compact, fully shielded and environmentally rugged frequency synthesis module that is the nucleus of every MT-3 synthesized Receiver and Transmitter radio module. The OS-3A/H generates a high stability, low distortion radio frequency signal in one of several frequency bands, including 29 - 50 MHz, 118 - 159.4 MHz, 118 - 174 MHz and 406 - 470 MHz. The OS-3A/H utilizes an internal temperature compensated 9.
Frequency Band: 118 - 159.4 MHz, AM Multichannel OS-3H1xx Analog Board • OST-3A128 • OSR-3A149 - installed in AM transmitter, 118 - 138 MHz RF output. - installed in AM receiver, 139.4 - 159.4 MHz RF output. Frequency Band: 128 - 174 MHz, Common OS-3H1xx Analog Board • OST-3H141 • OST-3H162 • OSR-3H141 • OSR-3H162 - installed in FM - installed in FM - installed in FM - installed in FM transmitter, 128 - 152.6 MHz RF output. transmitter, 150 - 174 MHz RF output. receiver, 128 - 152.6 MHz RF output.
1.3 Performance Specifications Type: Narrow band FM, Single loop synthesizer module utilizing low noise VCO and PLL technology. Compatible with Daniels MT-3 series Transmitter and Receiver modules. Frequency Range: 29 MHz - 38 MHz [±0.5 MHz] (OST-3H035) (Tuning range with no adjustment 38 MHz - 50 MHz [±1.0 MHz] (OST-3H045) is shown in [ ] brackets.) 50.4 MHz - 71.4 MHz [±1.0 MHz] (OSR-3H061) 118 MHz -138 MHz [Full band] (OST-3A128) 128 MHz - 152.6 MHz [±2.0 MHz] (OST-3H141, OSR-3H141) 139.
Modulation Sensitivity: 3.0 kHz peak deviation (400 mVrms input) External Reference Input: External reference input signal via SMB connector J1 Input level 0 dBm ±3 dB Input impedance 50Ω Input frequency 10.0 MHz or 9.6 MHz (selectable through digital board jumper JU1) Power Requirements: Normal Configuration: +9.5 Vdc @ 160 mA for FM and 65 mA for AM Low Current Standby Mode (TCXO enabled): +9.
1.4 Printed Circuit Board Numbering Convention To expedite troubleshooting and maintenance procedures, Daniels Electronics Ltd. has adopted a printed circuit board (PCB) numbering convention in which the last two digits of the circuit board number represent the circuit board version. All PCB's manufactured by Daniels Electronics Ltd. are identified by one of the following numbering conventions: • • PCB number PCB number 43-912010 50002-02 indicates circuit board version 1.
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2. THEORY OF OPERATION This is hidden text. 2.1 Internal Power and Control (Digital Board) Refer to "OS(R/T)-3(A/H) Digital Board Schematic Diagram" on page 4-19 of this manual. The synthesizer operates from a +9.5 Vdc power source applied to connector pin P1-2. Total current draw is approximately 160 mA for FM synthesizers and 65 mA for AM synthesizers. POWER DOWN control line P2-4 controls the +5.0 Vdc microcontroller regulator U2 through power MOSFET switch U1.
10.0 MHz and is selected via jumper JU2 on the Digital Board (9.6 MHz with JU2 not installed, 10.0 MHz with JU2 installed). If an external signal is used as the reference source, it must be a sinusoidal, low phase noise, high stability signal of 0 dBm ±3 dB level. A poor quality reference source will degrade receiver /transmitter performance to unacceptable levels. Transistor Q2 forms a buffer amplifier having 50Ω input impedance at 10.0 MHz. The internal 9.
2.2.2 29 - 71.4 MHz Analog Board Circuitry Refer to the "OS(R/T)-3H 29 - 71.4 MHz Analog Board Schematic Diagram" on page 4-3 of this manual. Field effect transistor Q5 forms part of the negative resistance VHF amplifier oscillator that is tuned on-frequency by the combination of resonator L5 and the total capacitive reactance presented across L5 through capacitors C62, C63, C64, C23 (Select), variable capacitor C24 and varactor diodes D1 and D2.
and D2. Coarse frequency adjustment is provided by varactor diodes D6, D7. SELECT capacitor values C40 and/or C23 are chosen to position the operating frequency in one of two bands; 118 - 138 MHz or 139.4 - 159.4.MHz. Varactor diodes D1 and D2 provide fine oscillator frequency control. PLL feedback control voltage, at the output of the low-pass loop filter, controls the VCO frequency through the reverse biasing of diodes D1 and D2. The PLL control voltage can range between ≈ +1.0 Vdc and +4.
established by the resistive dividers R21 and R22, allows low deviation (less than 5 kHz) direct frequency modulation of the VCO output signal. The PLL low-pass filter is formed by SELECT components C37, C38, C39, C45, R32 and R36. The loop filter response is optimized for switching time, noise and modulation requirements specific to each sub-band within the 128 - 174 MHz frequency range.
2.3 Synthesizer Digital Circuitry (Digital Board) Refer to the "OS(R/T)-3(A/H) Digital Board Schematic Diagram" on page 4-19 of this manual. Microcontroller U4 generates control signals utilized within the synthesizer module.
In transmitters, the synthesizer operating frequency is the transmitter operating frequency; however, for receivers, an IF Offset correction factor must be added to or subtracted from the synthesizer operating frequency in order to determine the actual receive frequency. For VHF and UHF Receivers, the IF Offset correction factor is 21.4 MHz, while for 800 and 900 MHz Receivers it is 45 MHz. Refer to Channel Designation Table documentation for simplified channel number and frequency information. 2.4.
2.6 5.0/6.25 kHz Channelization. All Daniels VHF synthesizers (excluding AM synthesizers) have been designed to generate frequencies in both 5.0 kHz and 6.25 kHz channel increments. BCD channel switch settings from 0000 to 4999 will therefore select operating frequencies with 5.0 kHz increments, while BCD switch settings from 5000 to 9999 will select operating frequencies with 6.25 kHz increments. Calculation of the operating frequency for VHF synthesizers capable of 5.0/6.
2.8 12.5 kHz Channelization. The operating frequency for Synthesizers having 12.5 kHz channelization is determined as follows: •Multiply the BCD switch setting by 12.5 kHz and add the result to the synthesizer base frequency. Example: An OST-3H418 synthesizer has a base frequency of 406 MHz. The selected channel number is 1660. The synthesizer output frequency is: ((1660 x 12.5 kHz) + 406 MHz) = 426.
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3. SYNTHESIZER ALIGNMENT This is hidden text. 3.1 General OS(R/T)-3(A/H) enhanced synthesizer alignment is simplified by using a Type 84 subrack and RF extender card/cable of providing receiver or transmitter power and signal interconnection. Alternately, +9.5 Vdc may be directly connected to a receiver or transmitter module with the positive connection on pins B6 / Z6 and the negative connection on pins B30 / Z30 / B32 / Z32. Receiver balanced audio (600 Ω) is available at pins B26 and Z26. 3.
The corresponding internal synthesizer jumper settings are: • • Digital Board Jumper JU2 not installed Jumper JU1 installed 9.6 MHz internal frequency reference selected AM Multichannel mode selected • • Analog Board Jumper JU1: 'B' position Jumper JU2 not installed Internal frequency reference selected Internal frequency reference selected 3.5 OS(R/T)-3(A/H) Synthesizer Alignment Invisible text 3.5.1 General Under normal circumstances (i.e.
3.5.3 Synthesizer Removal and Installation The synthesizer module is secured to the main board (MT-3 Receiver IF/Audio Board or MT-3 Transmitter Main board) with a single counter sunk Phillips machine screw accessible from the top cover. Remove this screw to remove the synthesizer module.
The measured RF output signal should be within ±1.0 ppm of the specified oscillator frequency at an output level of +5 dBm. Note that unlocked synthesizer operation will be indicated by an unstable or spurious RF output signal. The "Unlocked" red LED will also be illuminated when the PLL is unlocked. Check that the requested channel number is within the frequency range of the particular synthesizer model.
unlocked operation. The tuning range capability of all synthesizer models is listed in the Specifications section (1.3) of this manual. 3.5.5.2 VHF OS(R/T)-3A 118 - 159.4 MHz Alignment Refer to the "OS(R/T)-3A 118 - 159.4 MHz Analog Board Component Layout" diagram and the "OS(R/T)-3A 118 - 159.4 MHz Analog Board Schematic Diagram" on pages 4-5, 4-6 and 4-7 of this manual.
3.5.5.4 UHF OS(R/T)-3H 406 - 470 MHz VCO Alignment Refer to the "OS(R/T)-3H 406 - 470 MHz Analog Board Component Layout" diagram and the "OS(R/T)-3H 406 - 470 MHz Analog Board Schematic Diagram" on pages 4-13, 4-14 and 4-15 of this manual. Using a high impedance (10 MΩ) DC Voltmeter, measure the PLL control voltage at TP4 located on the synthesizer module analog board (top). Access to TP4 is available through the synthesizer top cover.
3.5.6 Jumper Configuration Solder jumpers are clearly marked on both synthesizer digital and analog circuit boards. Refer to the "OS(R/T)-3(A/H) Digital Board Component Layout (Bottom)" diagram on page 4-17 of this manual and the applicable "OS(R/T)-3(A/H) Analog Board Component Layout (Top)" diagram on page 4-18 for jumper locations. The following list details the required jumper configuration for the two synthesizer operating modes: 1) Internal reference.
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4 ILLUSTRATIONS AND SCHEMATIC DIAGRAMS 4.1 OS(R/T)-3H 29 - 71.4 MHz Analog Board Diagrams 4.1.1 OS(R/T)-3H 29 - 71.4 MHz Analog Board Component Layout (Bottom) R50 180R C42 22µF + C38 1.0µF C37 1.0µF C39 1.0µF 2K7 R32 15K R33 680R L5 SEL L7 4.7µH R40 180R C49 22nF R36 Q5 J211 L12 4.7µH + C50 22µF L9 1.5µH L8 1.5µH C24 1-14pF C45 470nF C54 22µF + L6 10µH L4 10µH C48 SEL R51 220R R2 330R L10 1.5µH R26 1R2 + LED1 L3 10µH L1 10µH TRANSMITTER L2 10µH PCB 50038-02 DESIG.
4.1.2 OS(R/T)-3H 29 - 71.4 MHz Analog Board Component Layout (Top) JU2 JU3 JU4 R27 15K0 C62 47pF MMBD701L C63 C64 C28 D3 22pF 12pF 1nF C23 SEL R20 10R0 C61 R25 SEL D2 10R0 MMBV609L D1 MMBV609L R22 1k00 J1 C41 1nF R21 20k0 C25 1nF C17 1nF C4 10nF R1 49R9 C9 10nF C35 3.
+8VA 4.1.3 U9 SI9945DY OS(R/T)-3H 29 - 71.4 MHz Analog Board Schematic Diagram 1 AGND P1 8 VIN MODULATION INPUT L1 10uH C1 1.0nF TP1 OUTPUT 1 7 GND ADJ 2 6 GND GND 3 5 SHDN TO ALL +8VA SUPPLY POINTS R13 11K8 + C12 4.
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4.2 OS(R/T)-3A 118 - 159.4 MHz Analog Board Diagrams 4.2.1 OS(R/T)-3A 118 - 159.4 MHz Analog Board Component Layout (Bottom) PCB 50082-04 L8 1.5uH Q5 J211 L7 1.5uH C42 22uF + C39 SEL C38 SEL C37 SEL R36 SEL R32 SEL R33 680R L5 L4 1.5µH R2 330R C45 SEL C63 680nF L13 1.5uH C49 SEL L6 1.5uH R26 1R2 + LED1 L3 10uH SELECT COMPONENTS L2 10uH DESIG. AM TX 118 - 138 MHz OS - 3A128 C37 C38 C39 C45 C49 R32 470 nF 100 nF NOT INSTALLED 330 nF 2.2 nF 68K R36 8K2 - - AM RX 139.4 - 159.
4.2.2 OS(R/T)-3A 118 - 159.4 MHz Analog Board Component Layout (Top) PCB 50082-04 Select values C40 SEL C23 SEL R27 11k8 D6 SEL D3 MMBD701L C28 6.8µF C35 5.6pF R63 C34 10R0 10nF C60 2.2µF R31 49R9 C32 C36 100µF 3.3pF D7 R20 10R0 SEL D1 D2 MMBV609L MMBV609L U18 C17 1nF PIC12C672 R37 C61 U17 49k9 LTC1275I 4.
+8VA C32 AND C33 ARE SURFACE MOUNT OR THROUGH HOLE PARTS 4.2.3 OS(R/T)-3(A/H) 118 - 159.4 MHz Analog Board Schematic Diagram +8VA TP1 8 VIN C5 100nF OUTPUT 1 7 GND ADJ 2 6 GND GND 3 5 SHDN 1 AGND 2 R13 11K8 R22 137K0 U6 LT1129-IS8 D1 8 G1 D1 7 S2 D2 6 G2 D2 5 R27 11K8 2 AGND 7 POWER CNTRL L4 1.5uH A U7 LP2951 AGND AGND R4 10K0 R3 10K0 C 8 INPUT OUTPUT 1 5 ERROR SENSE 2 3 SHDN B P2 AGND 9.5V 8 INPUT + C6 47uF C2 1.
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4.3 OS(R/T)-3H 128 - 174 MHz Analog Board Diagrams 4.3.1 OS(R/T)-3H 128 - 174 MHz Analog Board Component Layout (Bottom) L9 1.5µH + C50 R50 22µF 180R C42 22µF + C37 1.0 µF SEL R32 SEL R33 680R C32 100µF C33 100µF C39 SEL C49 SEL L5 L5 L7 1.5µH R40 180R C38 SEL R36 Q5 J211 + + L4 1.5µH C45 SEL C54 22µF + L8 1.5µH R2 330R C24 1-14pF L6 1.5µH R51 220R R26 1R2 L10 1.5µH + LED1 L3 10uH SELECT COMPONENTS VHF LOW BAND VHF HIGH BAND DESIG.
4.3.2 OS(R/T)-3H 128 - 174 MHz Analog Board Component Layout (Top) C24 Fine Frequency Adjust Select values R27 11k8 C23 SEL C28 6.8µF C40 SEL D3 MMBD701L C34 10nF R20 10R0 D1 N/I J1 SELECT COMPONENTS Receiver Transmitter 128 - 174 MHz 128 - 174 MHz OSR - 3Hxxx OST - 3Hxxx R22 100R 0R0 R25 10R0 C17 1nF C25 1nF R21 20k0 C4 10nF R1 49R9 C9 10nF BC817 C40 12 pF 3.3 pF 12 pF 6.8 pF 8.2 pF 6.
4.3.3 OS(R/T)-3H 128 - 174 MHz Analog Board Schematic Diagram +8VA U9 SI9945DY P1 8 VIN MODULATION INPUT L1 10uH OUTPUT 1 7 GND Z1 R13 11K8 GND 3 5 SHDN 4 GND 3 R3 10K0 AGND C B OUTPUT 1 5 ERROR SENSE 2 3 SHDN 5VTAP 6 U8 LP2951 R15 10R0 +5VB + C6 47uF C7 10nF 8 INPUT OUTPUT 1 5 ERROR SENSE 2 3 SHDN 5VTAP 6 TCXO1 9.6 MHz C14 10nF TP3 AGND AGND + 3 VCC AGND + 1 C15 4.7uF FB 7 2 G C24 1-14pF 1 C28 6.
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4.4 OS(R/T)-3H 406 - 470 MHz Analog Board Diagrams 4.4.1 OS(R/T)-3H 406 - 470 MHz Analog Board Component Layout (Bottom) R50 180R L9 1.5µH + + + C50 22µF L7 1.5µH VCO INSTALLED (U17) 1 RX 427.4 - 451.4 MHz C42 + 22µF LVCO-2309 TEV R40 180R C39 SEL C49 SEL R36 SEL SEL R32 680R R33 VCO-190-435 MT U17 C38 SEL C37 1µF TX 406 - 470 MHz C54 22uF + L8 1.5µH C45 SEL VCO R2 330R L6 R21 1.5µH SEL R51 220R R26 1R2 L10 1.
4.4.
4.4.3 OS(R/T)-3H 406 - 470 MHz Analog Board Schematic Diagram P1 L1 10uH 8 VIN +8VA Z1 1 R13 11K8 GND 3 5 SHDN 4 C5 100nF VCC 1 OUT 2 POWER CNTRL U7 LP2951 R3 10K0 AGND C B 8 INPUT OUTPUT 1 RX 427.4 - 451.4 MHz 5 ERROR SENSE 2 3 SHDN 5VTAP 6 4 GND 2 R21 SEL + C13 4.7uF U8 LP2951 3 C7 10nF 8 INPUT OUTPUT 1 5 ERROR SENSE 2 3 SHDN 5VTAP 6 4 GND R25 10R0 TCXO1 9.6 MHz R15 10R0 AGND AGND + 3 VCC C15 4.7uF FB 7 GND OUTPUT FREQ CONTROL C3 1.
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4.5 OS(R/T)-3(A/H) Digital Board Diagrams 4.5.1 OS(R/T)-3(A/H) Digital Board Component Layout (Bottom) C9 100nF U3 MC33064 R19 27k4 R8 6k81 C8 4.7uF Q9 BC817 R6 27k4 P1 1ROW x 12P 1ROW x 9P C7 22pF X1 8.
4.5.
OS(R/T)-3(A/H) Digital Board Schematic Diagram P1 +5VD 20 P1-20 L1 10.
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5. PARTS LISTS This is hidden text. 5.1 OS(R/T)-3H 29 - 71.4 MHz Analog Board Electrical Parts List Ref. Desig Description Part No. C1 - C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C21 C20 C22 C23 C23 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32, C33 C34 C34 C34 C35 C36 C37, C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 CAP., SM 1.0nF CER., 0805, X7R, 50V CAP., SM 10nF CER, 0805, X7R, 50V CAP., SM 100nF CER., 0805, X7R, 50V CAP., SM 47uF TANT., 20%, 16V CAP., SM 10nF CER, 0805, X7R, 50V CAP.
Ref. Desig Description Part No. C48 C48 C48 C49 C50 C51 C52 C53 C53 C53 C54 C55 C56 C57 C57 C57 C58 C58 C58 C59 C59 C59 C61 C61 C61 C62 C63 C64 CAP., 68nF FILM, MMK5, 10%,63V CAP., 68nF FILM, MMK5, 10%,63V CAP., Not Installed CAP., 22nF FILM, MMK5, 10%,63V CAP., 22uF DIP. TANT., 20%, 20V CAP., SM 10nF CER, 0805, X7R, 50V CAP., SM 330pF CER., 0805, COG CAP., SM, 56pF CER., 0805, C0G CAP., SM, 56pF CER., 0805, C0G CAP., SM, Not Installed CAP., 22uF DIP. TANT., 20%, 20V CAP.
Ref. Desig Description Part No. Q1, Q2 Q3 Q4 Q5 TRANSISTORBC817 NPN, SOT23 TRANSISTORBC807 PNP, SOT23 TRANSISTORBC817 NPN, SOT23 JFET, J211 RF N-CHAN. TO-92 2120-BC817025 2120-BC807025 2120-BC817025 2041-J2110000 RV1 POT., SM 5K0 1T, TOP ADJ 1174-AS2502J1 R1 R2 R3, R4 R5 R6 R7, R8 R9 R10 - R12 R13 R14 R15 R16, R17 R18, R19 R20 R21 R22 R23 - R25 R26 R27 R28 R29 R30 R31 R32 R33 R34, R35 R36 R38 R39 R40 R41 R44 R45 R46 R47 R48 R49 R50 R51 R52 R53 R54 R55 R56 RES., SM 49R9 0805, 1%,100ppm RES.
Ref. Desig Description Part No. U1 - U4 U5 U6 U7, U8 U9 U10 U11 U15 U16 DIODE, OPL550 I/R SENSOR,TTL O/P,PLST LED, OP140A I/R,GaAs,.81 x .23,PLAST. I.C., LT1129-IS8, PROG. VOLT REG, SO8 I.C., LP2951 PROG. VOLT REG, SO-8 MOSFET, SI9945DY, N CHAN.,SO-8 I.C., MC145191, PLL FREQ/SYNTH, SO-20 I.C., MSA-0611, MM1C AMP, SOT-143 I.C.
5.2 Ref. Desig C1- C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16, C17 C18 C19 C20 C21, C22 C23 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32, C33 C34 C35 C36 C37 C37 C38 C38 C39 C39 C40 C40 C41 C42 C43 C44 C45 C45 C46 C47 C48 Ref. OS(R/T)-3A 118 - 159.4 MHz Analog Board Electrical Parts List Description Part No. CAP., SM ,1.0nF CER., 0805, X7R, 50V CAP., SM, 10nF CER, 0805, X7R, 50V CAP., SM, 100nF CER., 0805, X7R, 50V CAP., SM, 47uF TANT., 20%, 16V CAP., SM, 10nF CER, 0805, X7R, 50V CAP., SM, 100nF CER.
Desig Description Part No. C49 C49 C50, C51 C52 C53 C58 C59 C60 C61 C62 C63 CAP., 22nF FILM, MMK5, 10%,63V CAP., 2.2nF FILM, MMK5,10%,63V CAP., SM, 100nF CER., 0805, X7R, 50V CAP., SM, 10nF CER, 0805, X7R, 50V CAP., SM, 27pF CER., 0805, COG CAP., SM, 47pF CER., 0805, COG CAP., SM, 27pF CER., 0805, COG CAP., SM, 2.2uF TANT., 20%, 20V CAP., SM, 4.7uF TANT., 10%, 16V CAP., SM, 10nF CER, 0805, X7R, 50V CAP.
Ref. Desig Description Part No. R20 R22 R23 - R25 R26 R27 R28 R29 R30 R31 R32 R32 R33 R34, R35 R36 R36 R37, R38 R39 R40 R41 R42 R43 R44 R45 R46 R53 R57 R58 R59 R60 R60 R61 R62 R63 RES., SM, 10R0 0805, 1%,100ppm RES., SM, 137K0 0805, 1%,100ppm RES., SM, 10R0 0805, 1%,100ppm RES., 1R2 METAL FILM, 5%, 0.5W RES., SM, 11K8 0805, 1%,100ppm RES., SM, 10R0 0805, 1%,100ppm RES., SM, 18K2 0805, 1%,100ppm RES., SM, 10R0 0805, 1%,100ppm RES., SM, 100R 0805, 1%,100ppm RES., 15K METAL FILM, 5%, 0.5W RES.
5.3 Ref. Desig C1-C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21,C22 C23 C23 C24 C25 C25 C26 C27 C28 C29 C30 C31 C32, C33 C34 C35 C35 C36 C37 C37 C38 C38 C39 C39 C40 C40 C42 C43 C44 C45 C45 C46,C47 Ref. 5-8 OS(R/T)-3H 128 - 174 MHz Analog Board Electrical Parts List Description Part No. CAP., SM, 1.0nF CER., 0805, X7R, 50V CAP., SM, 10nF CER, 0805, X7R, 50V CAP., SM, 100nF CER., 0805, X7R, 50V CAP., SM, 47µF TANT., 20%, 16V CAP., SM, 10nF CER, 0805, X7R, 50V CAP., SM, 100nF CER.
Desig Description Part No. C49 C49 C50 C51 C52 C53 C54 C55 C56 C58 C59 CAP., 33nF FILM, MMK5, 10%, 63V CAP., 22nF FILM, MMK5, 10%, 63V CAP., 22µF DIP. TANT., 20%, 20V CAP., SM, 10nF CER, 0805, X7R, 50V CAP., SM, 330pF CER., 0805, COG CAP., SM, 27pF CER., 0805, COG CAP., 22µF DIP. TANT., 20%, 20V CAP., SM, 10nF CER, 0805, X7R, 50V CAP., SM, 330pF CER., 0805, COG CAP., SM, 47pF CER., 0805, COG CAP., SM, 27pF CER.
Ref. Desig Description Part No. R23-R25 R26 R27 R28 R29 R30 R31 R32 R32 R33 R34,R35 R36 R36 R39 R40 R41 R44 R45 R46 R47, R48 R49 R50 R51 R52 R53 R54 R55 R56 RES., SM, 10R0 0805, 1%,100ppm RES., 1R2 METAL FILM, 5%, 0.5W RES., SM, 11K8 0805, 1%,100ppm RES., NOT INSTALLED RES., SM, 3K92 0805, 1%,100ppm RES., SM, 10R0 0805, 1%,100ppm RES., SM, 49R9 0805, 1%,100ppm RES., 12K METAL FILM, 5%, 0.5W RES., 15K METAL FILM, 5%, 0.5W RES., 680R METAL FILM, 5%, 0.5W RES., SM, 10K0 0805, 1%,100ppm RES.
5.4 Ref. Desig C1 - C3 C4 C5 C6 C7 C8 C9 C10 C11 C12, C13 C14 C15 C16 C17 C18 C19 C20 C21, C22 C25, C26 C27 C29 C30 C31 C32, C33 C34 C35 C36 C37 C38 C38 C39 C39 C42 C43 C44 C45 C45 C46 C47 C49 C49 C50 C51 C52 C53 C54 C55 C56 C58 Ref. OS(R/T)-3H 406 - 470 MHz Analog Board Electrical Parts List Description Part No. CAP., SM 1.0nF CER., 0805, X7R, 50V CAP., SM 10nF CER, 0805, X7R, 50V CAP., SM 100nF CER., 0805, X7R, 50V CAP., SM 47uF TANT., 20%, 16V CAP., SM 10nF CER, 0805, X7R, 50V CAP., SM 100nF CER.
Desig Description Part No. C59 C60 C60 CAP., SM, 10pF CER., 0805, C0G CAP., 100nF FILM, MMK5, 10%, 63V CAP., NOT INSTALLED 1008-1A100J1G 1016-5A104K63 NOT INSTALLED D4 D5 DIODE, BYD17J RECTIFIER,SOD87 DIODE, BAS16 SWITCHING, SOT23 2101-BYD17J00 2100-BAS16000 L1 - L3 L6 - L10 L11 L12 CHOKE, RF/MOULD.10uH 10%,.25 CHOKE, RF/MOULD.1.5uH 10%,.25 INDUCTOR, SM18nH CER,10%,1008 1251-4A00100K 1251-3A001R5K 1256-1B18N00K LED1 LED, SUB-MIN.
Desig Description Part No. R40 R41 R44 R45 R46 R47 R48 R48 R48 R49 R49 R49 R50 R51 R52 R52 R52 R53 R54 R55, R56 R57 R58 RES.180R METAL FILM, 5%, 0.5W RES., SM 18R2 0805, 1%,100ppm RES., SM 47R5 0805, 1%,100ppm RES., SM 27R4 0805, 1%,100ppm RES., SM 33R2 0805, 1%,100ppm RES., SM 47R5 0805, 1%,100ppm RES., SM 47R5 0805, 1%,100ppm RES., SM 27R4 0805, 1%,100ppm RES., SM 27R4 0805, 1%,100ppm RES., SM 10R0 0805, 1%,100ppm RES., SM 33R2 0805, 1%,100ppm RES., SM 33R2 0805, 1%,100ppm RES.180R METAL FILM, 5%, 0.
5.5 OS(R/T)-3(A/H) Digital Board Electrical Parts List Ref. Desig Description Part No. C1,C2 C3-C5 C6,C7 C8 C9-C14 C15 CAP., SM, 100nF CER., 0805, X7R, 50V CAP., SM, 47µF TANT., 20%, 16V CAP., SM, 22pF CER., 0805, COG CAP., SM, 4.7µF TANT., 10%, 16V CAP., SM, 100nF CER., 0805, X7R, 50V CAP., SM, 10µF TANT.
5.6 OS(R/T)-3(A/H) Synthesizer Mechanical Parts List Description Part No. CASE, OS-3H SYNTH. MODULE,ALUM 3702-66100920 1 CONN., SMB, JACK,2 HOLE FLANGE 5120-J2SC01BG 2 FERRITE, BEAD,73 MIX, FERRITE, BEAD,43 MIX, FERRITE, BEAD,43 MIX, FERRITE, BEAD,61 MIX, 1210-73030350 1210-43030350 1210-43030350 1210-61030350 3 3 3 3 HEADER, .1”, 1 ROWX3PIN, AU 5010-H103ST7L 2 LABEL, FOIL,FRQ/SN,OS-3H SYNTH 3501-13091006 1 LID, CASE,OS-3H SYNTH/MODL.
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6. REVISION HISTORY ISSUE DATE REVISION 1 May 97 • Issue 1 2 Mar 98 • 3 Mar 00 • 4 Changes to the AM Analog board (OST-3A128) to improve performance ECO #547. C37 was 220nF is now 100nF and C40 was 8.2pF is now not installed C45 was 33nF is now 22nF and C49 was 2.2nF is now 1.5nF R32 was 33kΩ is now 56kΩand R36 was 3k3Ω is now 5k6Ω Changes to the AM Analog board to improve performance at ECO #565. L4 was 1.5µH is now 3.9 µH -40˚C. • Changes to the FM Analog boards to improve manufacturing.
ISSUE DATE 4 Aug 00 • Changes to the OS(R/T)-3(A/H) Digital board. ECO #599. R30, R31 & R32 were 332R are now 215R. • 7-2 REVISION Changes to the OS-3H 406-470 MHz Analog board. ECO # 597. R48 was 27R4 is now 47R5, R49 was 33R2 is now 10R. R52 was 49R9 is now Not Installed.
DANIELS ELECTRONICS LTD. ® MT-3 RADIO SYSTEMS VHF TRANSMITTER CHANNEL DESIGNATION TABLES VT-3 132-174 MHz Covers model: VT-3/140-SWA2, VT-3/160-SWA2 VT-3/140-SWA8, VT-3/160-SWA8 VT-3/140-SNA2, VT-3/160-SNA2 VT-3/140-SNA8, VT-3/160-SNA8 Copyright © 1998 Daniels Electronics Ltd. All rights reserved.
NOTE: The user's authority to operate this equipment could be revoked through any changes or modifications not expressly approved by Daniels Electronics Ltd. The design of this equipment is subject to change due to continuous development. This equipment may incorporate minor changes in detail from the information contained in this manual.
TABLE OF CONTENTS Page 1. VT-3/140 Channel Designation Table: 132-150MHz, 5kHz Increments ..........................1-1 2 VT-3/140 Channel Designation Table: 132-150MHz, 6.25kHz Increments .....................2-1 3 VT-3/160 Channel Designation Table: 150-174MHz, 5kHz Increments ..........................3-1 4 VT-3/160 Channel Designation Table: 150-174MHz, 6.25kHz Increments .....................4-1 5 REVISION HISTORY................................................................................
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1. Chan. Num. 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 VT-3/140 Channel Designation Table: 132-150MHz, 5kHz Increments Freq. (MHz) 132.00000 .00500 .01000 .01500 .02000 .02500 .03000 .03500 .04000 .04500 .05000 .05500 .06000 .06500 .07000 .07500 .
VT-3/140 Channel Designation Table: 132 to 150 MHz, 5 kHz Increments (continued) Chan. Num. Freq. (MHz) 1325 134.62500 1326 .63000 1327 .63500 1328 .64000 1329 .64500 1330 .65000 1331 .65500 1332 .66000 1333 .66500 1334 .67000 1335 .67500 1336 .68000 1337 .68500 1338 .69000 1339 .69500 1340 .70000 1341 .70500 1342 .71000 1343 .71500 1344 .72000 1345 .72500 1346 .73000 1347 .73500 1348 .74000 1349 .74500 1350 134.75000 1351 .75500 1352 .76000 1353 .76500 1354 .77000 1355 .77500 1356 .78000 1357 .
VT-3/140 Channel Designation Table: 132 to 150 MHz, 5 kHz Increments (continued) Chan. Num. Freq. (MHz) 1850 137.25000 1851 .25500 1852 .26000 1853 .26500 1854 .27000 1855 .27500 1856 .28000 1857 .28500 1858 .29000 1859 .29500 1860 .30000 1861 .30500 1862 .31000 1863 .31500 1864 .32000 1865 .32500 1866 .33000 1867 .33500 1868 .34000 1869 .34500 1870 .35000 1871 .35500 1872 .36000 1873 .36500 1874 .37000 1875 .37500 1876 .38000 1877 .38500 1878 .39000 1879 .39500 1880 .40000 1881 .40500 1882 .41000 1883 .
VT-3/140 Channel Designation Table: 132 to 150 MHz, 5 kHz Increments (continued) Chan. Num. Freq. (MHz) 2375 139.87500 2376 .88000 2377 .88500 2378 .89000 2379 .89500 2380 .90000 2381 .90500 2382 .91000 2383 .91500 2384 .92000 2385 .92500 2386 .9 3000 2387 .93500 2388 .94000 2389 .94500 2390 .95000 2391 .95500 2392 .96000 2393 .96500 2394 .97000 2395 .97500 2396 .98000 2397 .98500 2398 .99000 2399 .99500 2400 140.00000 2401 .00500 2402 .01000 2403 .01500 2404 .02000 2405 .02500 2406 .03000 2407 .
VT-3/140 Channel Designation Table: 132 to 150 MHz, 5 kHz Increments (continued) Chan. Num. Freq. (MHz) 2900 142.50000 2901 .50500 2902 .51000 2903 .51500 2904 .52000 2905 .52500 2906 .53000 2907 .53500 2908 .54000 2909 .54500 2910 .55000 2911 .55500 2912 .56000 2913 .56500 2914 .57000 2915 .57500 2916 .58000 2917 .58500 2918 .59000 2919 .59500 2920 .60000 2921 .60500 2922 .61000 2923 .61500 2924 .62000 2925 .62500 2926 .63000 2927 .63500 2928 .64000 2929 .64500 2930 .65000 2931 .65500 2932 .66000 2933 .
VT-3/140 Channel Designation Table: 132 to 150 MHz, 5 kHz Increments (continued) Chan. Num. Freq. (MHz) 3425 145.12500 3426 .13000 3427 .13500 3428 .14000 3429 .14500 3430 .15000 3431 .15500 3432 .16000 3433 .16500 3434 .17000 3435 .17500 3436 .18000 3437 .18500 3438 .19000 3439 .19500 3440 .20000 3441 .20500 3442 .21000 3443 .21500 3444 .22000 3445 .22500 3446 .23000 3447 .23500 3448 .24000 3449 .24500 3450 145.25000 3451 .25500 3452 .26000 3453 .26500 3454 .27000 3455 .27500 3456 .28000 3457 .
VT-3/140 Channel Designation Table: 132 to 150 MHz, 5 kHz Increments (continued) Chan. Num. Freq. (MHz) 3950 147.75000 3951 .75500 3952 .76000 3953 .76500 3954 .77000 3955 .77500 3956 .78000 3957 .78500 3958 .79000 3959 .79500 3960 .80000 3961 .80500 3962 .81000 3963 .81500 3964 .82000 3965 .82500 3966 .83000 3967 .83500 3968 .84000 3969 .84500 3970 .85000 3971 .85500 3972 .86000 3973 .86500 3974 .87000 3975 .87500 3976 .88000 3977 .88500 3978 .89000 3979 .89500 3980 .90000 3981 .90500 3982 .91000 3983 .
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2 Chan. Num. VT-3/140 Channel Designation Table: 132-150MHz, 6.25kHz Increments Freq. (MHz) 5640 132.00000 5641 .00625 5642 .01250 5643 .01875 5644 .02500 5645 .03125 5646 .03750 5647 .04375 5648 .05000 5649 .05625 5650 .06250 5651 .06875 5652 .07500 5653 .08125 5654 .08750 5655 .09375 5656 .10000 5657 .10625 5658 .11250 5659 .11875 5660 .12500 5661 .13125 5662 .13750 5663 .14375 5664 .15000 5665 .15625 5666 .16250 5667 .16875 5668 .17500 5669 .18125 5670 .18750 5671 .19375 5672 .20000 5673 .20625 5674 .
VT-3/140 Channel Designation Table: 132 to 150 MHz, 6.25 kHz Increments (continued) Chan. Num. Freq. (MHz) 6165 135.28125 6166 .28750 6167 .29375 6168 .30000 6169 .30625 6170 .31250 6171 .31875 6172 .32500 6173 .33125 6174 .33750 6175 .34375 6176 .35000 6177 .35625 6178 .36250 6179 .36875 6180 .37500 6181 .38125 6182 .38750 6183 .39375 6184 .40000 6185 .40625 6186 .41250 6187 .41875 6188 .42500 6189 .43125 6190 .43750 6191 .44375 6192 .45000 6193 .45625 6194 .46250 6195 .46875 6196 .47500 6197 .
VT-3/140 Channel Designation Table: 132 to 150 MHz, 6.25 kHz Increments (continued) Chan. Num. Freq. (MHz) 6690 138.56250 6691 .56875 6692 .57500 6693 .58125 6694 .58750 6695 .59375 6696 .60000 6697 .60625 6698 .61250 6699 .61875 6700 .62500 6701 .63125 6702 .63750 6703 .64375 6704 .65000 6705 .65625 6706 .66250 6707 .66875 6708 .67500 6709 .68125 6710 .68750 6711 .69375 6712 .70000 6713 .70625 6714 .71250 6715 .71875 6716 .72500 6717 .73125 6718 .73750 6719 .74375 6720 138.75000 6721 .75625 6722 .
VT-3/140 Channel Designation Table: 132 to 150 MHz, 6.25 kHz Increments (continued) Chan. Num. Freq. (MHz) 7215 141.84375 7216 .85000 7217 .85625 7218 .86250 7219 .86875 7220 .87500 7221 .88125 7222 .88750 7223 .89375 7224 .90000 7225 .90625 7226 .91250 7227 .91875 7228 .92500 7229 .93125 7230 .93750 7231 .94375 7232 .95000 7233 .95625 7234 .96250 7235 .96875 7236 .97500 7237 .98125 7238 .98750 7239 .99375 7240 142.00000 7241 .00625 7242 .01250 7243 .01875 7244 .02500 7245 .03125 7246 .03750 7247 .
VT-3/140 Channel Designation Table: 132 to 150 MHz, 6.25 kHz Increments (continued) Chan. Num. Freq. (MHz) 7740 145.12500 7741 .13125 7742 .13750 7743 .14375 7744 .15000 7745 .15625 7746 .16250 7747 .16875 7748 .17500 7749 .18125 7750 .18750 7751 .19375 7752 .20000 7753 .20625 7754 .21250 7755 .21875 7756 .22500 7757 .23125 7758 .23750 7759 .24375 7760 145.25000 7761 .25625 7762 .26250 7763 .26875 7764 .27500 7765 .28125 7766 .28750 7767 .29375 7768 .30000 7769 .30625 7770 .31250 7771 .31875 7772 .
VT-3/140 Channel Designation Table: 132 to 150 MHz, 6.25 kHz Increments (continued) Chan. Num. Freq. (MHz) 8265 148.40625 8266 .41250 8267 .41875 8268 .42500 8269 .43125 8270 .43750 8271 .44375 8272 .45000 8273 .45625 8274 .46250 8275 .46875 8276 .47500 8277 .48125 8278 .48750 8279 .49375 8280 148.50000 8281 .50625 8282 .51250 8283 .51875 8284 .52500 8285 .53125 8286 .53750 8287 .54375 8288 .55000 8289 .55625 8290 .56250 8291 .56875 8292 .57500 8293 .58125 8294 .58750 8295 .59375 8296 .60000 8297 .
3 Chan. Num. VT-3/160 Channel Designation Table: 150-174MHz, 5kHz Increments Freq. (MHz) 000 150.00000 001 .00500 002 .01000 003 .0 1500 004 .02000 005 .02500 006 .03000 007 .03500 008 .04000 009 .04500 010 .05000 011 .05500 012 .06000 013 .06500 014 .07000 015 .07500 016 .08000 017 .08500 018 .09000 019 .09500 020 .10000 021 .10500 022 .11000 023 .11500 024 .12000 025 .12500 026 .13000 027 .13500 028 .14000 029 .14500 030 .15000 031 .15500 032 .16000 033 .16500 034 .17000 035 .17500 036 .18000 037 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Num. 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 3-2 Freq. (MHz) 152.62500 .63000 .63500 .64000 .64500 .65000 .65500 .66000 .66500 .67000 .67500 .68000 .68500 .69000 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Num. Freq. (MHz) 1050 155.25000 1051 .25500 1052 .26000 1053 .26500 1054 .27000 1055 .27500 1056 .28000 1057 .28500 1058 .29000 1059 .29500 1060 .30000 1061 .30500 1062 .31000 1063 .31500 1064 .32000 1065 .32500 1066 .33000 1067 .33500 1068 .34000 1069 .34500 1070 .35000 1071 .35500 1072 .36000 1073 .36500 1074 .37000 1075 .37500 1076 .38000 1077 .38500 1078 .39000 1079 .39500 1080 .40000 1081 .40500 1082 .41000 1083 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Num. Freq. (MHz) 1575 157.87500 1576 .88000 1577 .88500 1578 .89000 1579 .89500 1580 .90000 1581 .90500 1582 .91000 1583 .91500 1584 .92000 1585 .92500 1586 .93000 1587 .93500 1588 .94000 1589 .94500 1590 .95000 1591 .95500 1592 .96000 1593 .96500 1594 .97000 1595 .97500 1596 .98000 1597 .98500 1598 .99000 1599 .99500 1600 158.00000 1601 .00500 1602 .01000 1603 .01500 1604 .02000 1605 .02500 1606 .03000 1607 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Num. Freq. (MHz) 2100 160.50000 2101 .50500 2102 .51000 2103 .51500 2104 .52000 2105 .52500 2106 .53000 2107 .53500 2108 .54000 2109 .54500 2110 .55000 2111 .55500 2112 .56000 2113 .56500 2114 .57000 2115 .57500 2116 .58000 2117 .58500 2118 .59000 2119 .59500 2120 .60000 2121 .60500 2122 .61000 2123 .61500 2124 .62000 2125 .62500 2126 .63000 2127 .63500 2128 .64000 2129 .64500 2130 .65000 2131 .65500 2132 .66000 2133 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Num. Freq. (MHz) 2625 163.12500 2626 .13000 2627 .13500 2628 .14000 2629 .14500 2630 .15000 2631 .15500 2632 .16000 2633 .16500 2634 .17000 2635 .17500 2636 .18000 2637 .18500 2638 .19000 2639 .19500 2640 .20000 2641 .20500 2642 .21000 2643 .21500 2644 .22000 2645 .22500 2646 .23000 2647 .23500 2648 .24000 2649 .24500 2650 163.25000 2651 .25500 2652 .26000 2653 .26500 2654 .27000 2655 .27500 2656 .28000 2657 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Num. Freq. (MHz) 3150 165.75000 3151 .75500 3152 .76000 3153 .76500 3154 .77000 3155 .77500 3156 .78000 3157 .78500 3158 .79000 3159 .79500 3160 .80000 3161 .80500 3162 .81000 3163 .81500 3164 .82000 3165 .82500 3166 .83000 3167 .83500 3168 .84000 3169 .84500 3170 .85000 3171 .85500 3172 .86000 3173 .86500 3174 .87000 3175 .87500 3176 .88000 3177 .88500 3178 .89000 3179 .89500 3180 .90000 3181 .90500 3182 .91000 3183 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Num. Freq. (MHz) 3675 168.37500 3676 .38000 3677 .38500 3678 .39000 3679 .39500 3680 .40000 3681 .40500 3682 .41000 3683 .41500 3684 .42000 3685 .42500 3686 .43000 3687 .43500 3688 .44000 3689 .44500 3690 .45000 3691 .45500 3692 .46000 3693 .46500 3694 .47000 3695 .47500 3696 .48000 3697 .48500 3698 .49000 3699 .49500 3700 168.50000 3701 .50500 3702 .51000 3703 .51500 3704 .52000 3705 .52500 3706 .53000 3707 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Num. Freq. (MHz) 4200 171.00000 4201 .00500 4202 .01000 4203 .01500 4204 .02000 4205 .02500 4206 .03000 4207 .03500 4208 .04000 4209 .04500 4210 .05000 4211 .05500 4212 .06000 4213 .06500 4214 .07000 4215 .07500 4216 .08000 4217 .08500 4218 .09000 4219 .09500 4220 .10000 4221 .10500 4222 .11000 4223 .11500 4224 .12000 4225 .12500 4226 .13000 4227 .13500 4228 .14000 4229 .14500 4230 .15000 4231 .15500 4232 .16000 4233 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Num. Freq. (MHz) 4725 173.62500 4726 .63000 4727 .63500 4728 .64000 4729 .64500 4730 .65000 4731 .65500 4732 .66000 4733 .66500 4734 .67000 4735 .67500 4736 .68000 4737 .68500 4738 .69000 4739 .69500 4740 .70000 4741 .70500 4742 .71000 4743 .71500 4744 .72000 4745 .72500 4746 .73000 4747 .73500 4748 .74000 4749 .74500 4750 173.75000 4751 .75500 4752 .76000 4753 .76500 4754 .77000 4755 .77500 4756 .78000 4757 .
4 Chan. Num. VT-3/160 Channel Designation Table: 150-174MHz, 6.25kHz Increments Freq. (MHz) 5000 150.00000 5001 .00625 5002 .01250 5003 .01875 5004 .02500 5005 .03125 5006 .03750 5007 .04375 5008 .05000 5009 .05625 5010 .06250 5011 .06875 5012 .07500 5013 .08125 5014 .08750 5015 .09375 5016 .10000 5017 .10625 5018 .11250 5019 .11875 5020 .12500 5021 .13125 5022 .13750 5023 .14375 5024 .15000 5025 .15625 5026 .16250 5027 .16875 5028 .17500 5029 .18125 5030 .18750 5031 .19375 5032 .20000 5033 .20625 5034 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 6.25 kHz Increments (continued) Chan. Num. Freq. (MHz) 5525 153.28125 5526 .28750 5527 .29375 5528 .30000 5529 .30625 5530 .31250 5531 .31875 5532 .32500 5533 .33125 5534 .33750 5535 .34375 5536 .35000 5537 .35625 5538 .36250 5539 .36875 5540 .37500 5541 .38125 5542 .38750 5543 .39375 5544 .40000 5545 .40625 5546 .41250 5547 .41875 5548 .42500 5549 .43125 5550 .43750 5551 .44375 5552 .45000 5553 .45625 5554 .46250 5555 .46875 5556 .47500 5557 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 6.25 kHz Increments (continued) Chan. Num. Freq. (MHz) 6050 156.56250 6051 .56875 6052 .57500 6053 .58125 6054 .58750 6055 .59375 6056 .60000 6057 .60625 6058 .61250 6059 .61875 6060 .62500 6061 .63125 6062 .63750 6063 .64375 6064 .65000 6065 .65625 6066 .66250 6067 .66875 6068 .67500 6069 .68125 6070 .68750 6071 .69375 6072 .70000 6073 .70625 6074 .71250 6075 .71875 6076 .72500 6077 .73125 6078 .73750 6079 .74375 6080 156.75000 6081 .75625 6082 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 6.25 kHz Increments (continued) Chan. Num. Freq. (MHz) 6575 159.84375 6576 .85000 6577 .85625 6578 .86250 6579 .86875 6580 .87500 6581 .88125 6582 .88750 6583 .89375 6584 .90000 6585 .90625 6586 .91250 6587 .91875 6588 .92500 6589 .93125 6590 .93750 6591 .94375 6592 .95000 6593 .95625 6594 .96250 6595 .96875 6596 .97500 6597 .98125 6598 .98750 6599 .99375 6600 160.00000 6601 .00625 6602 .01250 6603 .01875 6604 .02500 6605 .03125 6606 .03750 6607 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 6.25 kHz Increments (continued) Chan. Num. Freq. (MHz) 7100 163.12500 7101 .13125 7102 .13750 7103 .14375 7104 .15000 7105 .15625 7106 .16250 7107 .16875 7108 .17500 7109 .18125 7110 .18750 7111 .19375 7112 .20000 7113 .20625 7114 .21250 7115 .21875 7116 .22500 7117 .23125 7118 .23750 7119 .24375 7120 163.25000 7121 .25625 7122 .26250 7123 .26875 7124 .27500 7125 .28125 7126 .28750 7127 .29375 7128 .30000 7129 .30625 7130 .31250 7131 .31875 7132 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 6.25 kHz Increments (continued) Chan. Num. Freq. (MHz) 7625 166.40625 7626 .41250 7627 .41875 7628 .42500 7629 .43125 7630 .43750 7631 .44375 7632 .45000 7633 .45625 7634 .46250 7635 .46875 7636 .47500 7637 .48125 7638 .48750 7639 .49375 7640 166.50000 7641 .50625 7642 .51250 7643 .51875 7644 .52500 7645 .53125 7646 .53750 7647 .54375 7648 .55000 7649 .55625 7650 .56250 7651 .56875 7652 .57500 7653 .58125 7654 .58750 7655 .59375 7656 .60000 7657 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 6.25 kHz Increments (continued) Chan. Num. Freq. (MHz) 8150 169.68750 8151 .69375 8152 .70000 8153 .70625 8154 .71250 8155 .71875 8156 .72500 8157 .73125 8158 .73750 8159 .74375 8160 169.75000 8161 .75625 8162 .76250 8163 .76875 8164 .77500 8165 .78125 8166 .78750 8167 .79375 8168 .80000 8169 .80625 8170 .81250 8171 .81875 8172 .82500 8173 .83125 8174 .83750 8175 .84375 8176 .85000 8177 .85625 8178 .86250 8179 .86875 8180 .87500 8181 .88125 8182 .
VT-3/160 Channel Designation Table: 150 to 174 MHz, 6.25 kHz Increments (continued) Chan. Num. Freq. (MHz) 8675 172.96875 8676 .97500 8677 .98125 8678 .98750 8679 .99375 8680 173.00000 8681 .00625 8682 .01250 8683 .01875 8684 .02500 8685 .03125 8686 .03750 8687 .04375 8688 .05000 8689 .05625 8690 .06250 8691 .06875 8692 .07500 8693 .08125 8694 .08750 8695 .09375 8696 .10000 8697 .10625 8698 .11250 8699 .11875 8700 .12500 8701 .13125 8702 .13750 8703 .14375 8704 .15000 8705 .15625 8706 .16250 8707 .
5 REVISION HISTORY ISSUE DATE REVISION 1 • Issue 1 May 98 VHF Transmitter Channel Designation Tables VT-3 132 - 174 MHz 5-1
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