Eclipse Series RF Technology rfinfo@rftechnology.com.au November 2001 T220 Transmitter Operation and Maintenance Manual This manual is produced by RF Technology Pty Ltd., 10/8 Leighton Place, Hornsby, 2077, Australia Copyright © 2001, RF Technology Part No.
CONTENTS Contents 1 Operating Instructions 1.1 Front Panel Controls and Indicators 1.1.1 PTT 1.1.2 Line 1.1.3 PWR LED 1.1.4 TX LED 1.1.5 ALARM LED 5 5 5 5 6 6 6 2 Transmitter Internal Jumper Options 2.1 JP2: EPROM type 2.2 JP3: Dc Loop PTT 2.3 JP4: Audio Input Source 2.4 JP6: Input Level Attenuation 2.5 JP7: Audio Response 2.6 JP8: Sub-audible Tone source 2.7 JP9/10/11: dc Loop Configuration 7 7 7 7 7 8 8 8 3 Transmitter I/O Connections 3.
CONTENTS 7 Specifications 7.1 Overall Description 7.1.1 Channel Capacity 7.1.2 CTCSS 7.1.3 Channel Programming 7.1.4 Channel Selection 7.1.5 Microprossor 7.2 Physical Configuration 7.3 Front Panel Controls, Indicators and Test Points 7.3.1 Controls 7.3.2 Indicators 7.3.3 Test Points 7.4 Electrical Specifications 7.4.1 Power Requirements 7.4.2 Frequency Range and Channel Spacing 7.4.3 Frequency Synthesizer Step Size 7.4.4 Frequency Stability 7.4.5 Number of Channels 7.4.6 Antenna Impedance 7.4.
CONTENTS A Engineering Diagrams A.1 Block Diagram A.2 Circuit Diagrams A.
1 OPERATING INSTRUCTIONS WARNING Changes or modifications not expressly approved by RF Technology could void your authority to operate this equipment. Specifications may vary from those given in this document in accordance with requirements of local authorities. RF Technology equipment is subject to continual improvement and RF Technology reserves the right to change performance and specification without further notice. 1 Operating Instructions 1.1 Front Panel Controls and Indicators 1.1.
1.
2 TRANSMITTER INTERNAL JUMPER OPTIONS 2 Transmitter Internal Jumper Options In the following subsections an asterisk (*) signifies the standard (Ex-Factory) configuration of a jumper. 2.1 JP2: EPROM Type Condition 27C256 27C64 Position 2-3 * 1-2 2.2 JP3: Dc Loop PTT This jumper enables or disables the keying of the PTT function by means of a dc signal passed down the 600Ω line input pair. When enabled, JP9-JP11 control how the dc signal is configured with respect to an internal optocoupler.
2.5 JP7: Audio Response 4 CHANNEL AND TONE FREQUENCY PROGRAMMING 2.5 JP7: Audio Response Condition 750 uSec. pre-emphasis Flat response Position 1-2 * 2-3 2.6 JP8: Sub-audible Tone Source Condition Internal CTCSS External input Position 1-2, 4-5 * 2-3, 5-6 2.7 JP9/10/11: dc Loop Configuration These settings are only relevant when the PTT signal is to be used across the same wires as the audio. Refer to setting of JP3. They control the levels and connection into the audio balanced line circuitry.
4 CHANNEL AND TONE FREQUENCY PROGRAMMING TecHelp can be supplied by your dealer, distributor or by contacting RF Technology directly. Function dc power Channel Select RS232 Data 600Ω Line Signal +12 Vdc -12 Vdc 1 2 4 8 10 20 40 80 In Out High Low 150Ω / Hybrid Direct PTT input T/R Relay driver output Sub-Audible Tone Input High-Z Audio Input + + - External ALC input Pins 1, 14 13, 25 21 9 22 10 23 11 24 12 15 2 20 6 7 19 3 16 5 18 4 17 8 Specification +11.
5 CIRCUIT DESCRIPTION The VCO output is amplified and buffered by monolithic amplifiers MA2 and MA3 before being fed to the PLL IC U6. Amplifiers MA1, MA4 and MA5 increase the VCO output to approximately 4 mW to drive the power amplifier. MA1 is not switched on until the PLL has locked and had time to settle. This prevents any momentary off channel transmission when the transmitter is keyed. 5.
5 CIRCUIT DESCRIPTION The resulting control voltage supplies Q2 through R10, R12 and completes the power leveling control loop. 5.4 600Ω ΩLine Input The 600Ω balanced line input connects to line isolation transformer T1. T1 has two 150Ω primary windings which are normally connected in series for 600Ω lines. The dual primary windings can be used to privide DC loop PTT signalling or a 2/4 wire hybrid connection. All four leads are available at the rear panel system connector.
5 CIRCUIT DESCRIPTION from U7c before it is combined with the voice audio signal in the summing amplifier U7a. Back to back diodes D4 and D5 limit the maximum tone signal amplitude to prevent excessive tone deviation when external tone sources are used. 5.8 Audio Signal Processing Jumper JP4 selects either the line or direct input source. The selected source is then connected to JP6.
5 CIRCUIT DESCRIPTION A bridge consisting of diodes D6, D8, D9 and D14 ensures correct operation regardless of the current polarity. Q17 limits the current and D7 limits the voltage input to ISO1. Any low voltage current source capable of providing 2 mA at 4 V or switching circuit with less than 4.8k$\Omega$ loop resistance can be used to switch the DC loop. The test PTT button on the front panel and the local microphone PTT button will also key the transmitter.
6 FIELD ALIGNMENT PROCEDURE The procedures below do not constitute an exhaustive test or a complete alignment of the module, but if successfully carried out are adequate in most circumstances. TCXO calibration may be periodically required owing to normal quartz crystal aging. A drift of 1ppm/year is to be expected. Each alignment phase assumes that the preceding phase has been successfully carried out, or at least that the module is already in properly aligned state with respect to preceding conditions.
6 FIELD ALIGNMENT PROCEDURE 4 Measure the carrier frequency at the output connector, and adjust XO1 until the correct carrier frequency is measured, ±50Hz. 6.4 Modulation Balance 1. Set RV3 fully CCW (subtone off). 2. Set RV1 fully CW (maximum deviation) 3. Set RV2 mid-position 4. Set JP7 for flat response 5. Key the transmitter on 6. Set the audio input to 150Hz, 0dBm. 7. Measure deviation and adjust RV4 (line Level) for a deviation of 5kHz (2.5kHz for narrow band transmitters). 8.
6 FIELD ALIGNMENT PROCEDURE 6.6 Deviation 1. Set RV4 (Line Level) fully clockwise (CW). 2. Set the audio to 1kHz, 0dBm, on the line input. 3. Key the transmitter on.. 4. Adjust RV1 (Set Max. Deviation) for a deviation of 2.5kHz. 5. Key the transmitter off. 6. Carry out the Line Input Level alignment procedure (section 6.7) 6.7 Line Input Level 1. Set the audio to 1kHz, 0dBm, on the line input, or use the actual signal to be transmitted. 2. Key the transmitter on. 3.
7 SPECIFICATIONS 7 SPECIFICATIONS 7.1 Overall Description The transmitter is a frequency synthesized, narrow band FM unit, normally used to drive a 100 watt amplifier. It can also be used alone in lower power applications from 2 to 25W. All necessary control and 600 ohm line interface circuitry is included. 7.1.1 Channel Capacity Although most applications are single channel, it can be programmed for up to 100 channels, numbered 0--99.
7 SPECIFICATIONS 7.1.5. Microprocessor A microprocessor is used to control the synthesizer, tone squelch, PTT function and facilitate channel frequency programming. With the standard software, RF Technology modules also provide fault monitoring and reporting. 7.2 Physical Configuration The transmitter is designed to fit in a 19 inch rack mounted sub-frame. The installed height is 4 RU (178 mm) and the depth is 350 mm. The transmitter is 63.5 mm or two Eclipse modules wide. 7.
7 SPECIFICATIONS 7.4 Electrical Specifications 7.4.1 Power Requirements Operating Voltage - 10.5 to 16 Vdc with output power reduced below 12 Vdc Current Drain - 5A Maximum, typically 0.25A Standby Polarity - Negative Ground 7.4.2 Frequency Range and Channel Spacing 215 to 240 MHz 12.5KHz spacing 7.4.3 Frequency Synthesizer Step Size Step size is 5 or 6.25kHz, fixed 7.4.4 Frequency Stability ±2.5 ppm over 0 to +60 C, standard ±1ppm over -20 to +60 C, optional 7.4.
7 SPECIFICATIONS 7.4.8 Transmit Duty Cycle 100% to 40C, derating to zero at 60C. 100% to 5000ft altitude, derating to zero at 15,000ft. 7.4.9 Spurious and Harmonics Less than 0.25µW 7.4.10 Carrier and Modulation Attack Time Less than 20ms. Certain models have RF envelope attack and decay times controlled in the range 200µs< tr/f <2ms according to regulatory requirements. 7.4.
7 SPECIFICATIONS 7.4.16 Test Microphone Input 200Ω dynamic, with PTT 7.4.17 External Tone Input Compatible with R220 tone output 7.4.18 External ALC Input Output will be reduced 20dB by pulling the input down to below 1V. (Typically more than 40dB attenuation is available.) The input impedance is ≅10kΩ, internally pulled up to rail. The external ALC input can be connected to the power control circuit in Eclipse external power amplifiers. 7.4.
7 SPECIFICATIONS 7.4.22 Programmable No-Tone Period A No-Tone period can be appended to the end of each transmission to aid in eliminating squelch tail noise which may be heard in mobiles with slow turn off decoders. The No-Tone period can be set from 0--5 seconds in 0.1 second increments. The No Tone period operates in addition to the reverse phase burst at 3 the end of each transmission. 7.4.23 Firmware Timers The controller firmware includes some programmable timer functions.
7 SPECIFICATIONS Frequency No Tone 67.0 69.4 71.9 74.4 77.0 79.7 82.5 85.4 88.5 91.5 94.8 97.4 100.0 103.5 107.2 110.9 114.8 118.8 123.0 127.3 131.8 136.5 141.3 146.2 151.4 156.7 159.8 162.2 165.5 167.9 171.3 173.8 177.3 179.9 183.5 186.2 189.9 192.8 196.6 199.5 203.5 206.5 210.7 218.1 225.7 229.1 233.6 241.8 250.3 254.
A ENGINEERING DIAGRAMS 7.5.2 Power & I/O Connector 25-pin ``D'' Male Mounted on the rear panel 7.5.3 Test Connector 9-pin ``D'' Female mounted on the front panel A Engineering Diagrams Most Eclipse transmitter modules contain two PCBs, a motherboard with the control and signal generation circuitry (the exciter board), and an RF Power Amplifier board. Certain models are equipped with optional functions on piggyback PCBs atop the exciter motherboard.
A ENGINEERING DIAGRAMS A.3 Component Overlay Diagrams Figure 5 shows the PCB overlay guide with component positions for the main (exciter) PCB. Figure 6 shows the detailed circuit diagram with component numbers and values for the higher-power PA variation. Figure 7 shows the detailed circuit diagram with component numbers and values for the lower power PA variation.
APPENDIX B – T220 Parts List APPENDIX B – T220 Parts List Main PCB Assembly Parts Ref. Description Part Number C1 C10 C100 C102 C103 C104 C105 C106 C107 C108 C109 C11 C110 C111 C112 C113 C114 C115 C116 C117 C118 C119 C12 C13 C14 C15 C16 C17 C18 C19 C2 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C3 C30 C31 C32 C33 C34 C35 C36 C37 C38 CAP 10U 35V RAD ELECTRO CAP 1N0 5% 63V NPO SM1206 CAP 1N0 5% 63V NPO SM1206 CAP 10N 10% 63V X7R 1206 CAP 47N 20% 50V X7R RD.2 CAP 100N 10% 50V X7R RD.
APPENDIX B – T220 Parts List Ref. Description Part Number C39 C4 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C5 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C6 C60 C61 C62 C63 C64 C65 C66 C67 C68 C69 C7 C70 C71 C72 C73 C74 C75 C76 C77 C78 C79 C8 C80 C81 C82 C83 C84 C85 C86 C87 C88 C89 C9 C90 C91 CAP 1N0 5% 100V NPO RAD.2 CAP 10N 10% 50V X7R RAD.2 CAP 1N0 5% 100V NPO RAD.2 CAP 100N 10% 50V X7R RD.2 CAP 100N 10% 50V X7R RD.2 CAP 1N0 5% 100V NPO RAD.2 CAP 10N 10% 50V X7R RAD.2 CAP 1N0 5% 100V NPO RAD.
APPENDIX B – T220 Parts List Ref.
APPENDIX B – T220 Parts List Ref.
APPENDIX B – T220 Parts List Ref. Description Part Number R124 R125 R126 R127 R128 R129 R13 R130 R131 R132 R133 R134 R135 R136 R137 R138 R139 R14 R140 R141 R15 R16 R17 R18 R19 R2 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R3 R30 R31 R32 R33 R34 R35 R36 R37 R38 R39 R4 R40 R41 R42 R43 R44 R45 R46 R47 R48 R49 R5 R50 RES 150K 5% 0.25W AXIAL RES 680K 5% 0.25W AXIAL RES 680K 5% 0.25W AXIAL RES 470K 5% 0.25W AXIAL RES 680K 5% 0.25W AXIAL RES 470K 5% 0.25W AXIAL RES 1K0 5% 0.25W AXIAL RES 470 5% 0.
APPENDIX B – T220 Parts List Ref. Description Part Number R51 R52 R53 R54 R55 R56 R57 R58 R59 R6 R60 R61 R62 R63 R64 R65 R66 R67 R68 R69 R7 R70 R71 R72 R73 R74 R75 R76 R77 R78 R79 R8 R80 R81 R82 R83 R84 R85 R86 R87 R88 R89 R9 R90 R91 R92 R93 R94 R95 R96 R97 R98 R99 RN1 RN2 RV1 RV2 RV3 RV4 S1 RES 10K 5% 0.25W SM1206 RES 10K 5% 0.25W SM1206 RES 7K50 1% 0.25W AXIAL RES 10K0 1% 0.25W AXIAL RES 91K 5% 0.25W AXIAL RES 100K 5% 0.25W AXIAL RES 91K 5% 0.25W AXIAL RES 64K9 1% 0.25W AXIAL RES 64K9 1% 0.
APPENDIX B - T220 Parts List Ref. Description Part Number S2 S3 T1 U1 U10 U11 U13 U14 U2 U3 U4 U5 U6 U7 U8 U9 XO1 Y1 Y2 SWITCH BCD PRE-SET SWITCH BCD PRE-SET TRANSFORMER LINE 600 OHM IC RS232 INTER MAX232C IC ANALOGE GATE MC14066B IC QUAD NAND 74C00 DIP14 IC MICRO 68HC11A1P IC VOLT REGULATOR LM7805 IC 3 STATE BUF 74HC244N IC MICRO SUPER MC34064P-5 IC 8 BIT LATCH 74HC573N IC EPROM 27C256 IC FREQ SYN MB1501 SO16X IC QUAD OP AMP TLC274 IC DUAL FET OP AMP DIP8 IC QUAD OP AMP TLC274 TCXO 12.
R1 R10 R11 R12 R13 R14 R15 R16 R18 R19 R2 R20 R22 R23 R24 R25 R26 R27 R28 R29 R30 R33 R4 R5 R7 RT1 RV1 U1 C8 C9 C10 C11 C16 C17 C25 C26 L1 L2 L3 L4 L8 L9 L10 L11 R3 R6 R17 R21 R31 R32 CR1 U2 RES 220 5% 0.25W SM1206 RES 10R 5% 0.25W AXIAL RES 1K0 5% 0.25W AXIAL RES 10R 5% 0.25W AXIAL RES 470 5% 0.25W AXIAL RES 10K 5% 0.25W AXIAL RES 470 5% 0.25W AXIAL RES 470 5% 0.25W SM1206 RES 1K0 5% 0.25W AXIAL RES 100K 5% 0.25W AXIAL RES 100K 5% 0.25W AXIAL RES 100 5% 0.25W AXIAL RES 1K0 5% 0.25W AXIAL RES 47K 5% 0.
