MT-4 RADIO SYSTEMS PROJECT 25 DIGITAL VHF TRANSMITTER INSTRUCTION MANUAL VT-4R 136 - 174 MHz Covers models: VT-4R150 Copyright © 2000 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. DE™ is a registered trademark of Daniels Electronic Ltd.
Reviewed By: Quality Assurance: Claudia Boorman Name Signature _________________ Date 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 Introduction.............................................................................. 1.2 Interim Operation........................................................................ 1.3 Manual Organization.................................................................... 1.4 VT-4R150 Transmitter Family Models............................................... 1.
2.13.2.10 2.13.2.11 2.13.2.12 2.13.2.13 2.13.2.14 2.13.2.15 Analog Signaling Settings: Signaling ........................................ 2-9 Analog Signaling Settings: CTCSS Tone.................................. 2-10 Analog Signaling Settings: Reverse Burst................................. 2-10 Analog Signaling Settings: DCS Code..................................... 2-10 Analog Signaling Settings: Turnoff Code ................................. 2-10 Analog Squelch Settings: Invert DCS.....................
6 PARTS LIST .................................................................................. 6.1 Digital Repeater Transmitter Main Board Parts List................................. 6.1.1 Digital Repeater Transmitter Main Board Electrical Parts List .................. 6.1.2 Digital Repeater Transmitter Main Board Mechanical Parts List................ 6.2 Digital Repeater Microprocessor Board Parts List .................................. 6.2.1 Digital Repeater Microprocessor Board Electrical Parts List...
1 1.1 GENERAL Introduction The VT-4R150 Project 25 Digital Transmitters are low current, synthesized FM Transmitters capable of analog or Project 25 digital operation in 12.5 kHz (narrow band) or 25 (wide band) channels. They operate over the bands from 136-150 and 150-174 MHz. Modular design allows each of the Transmitter’s internal modules to be individually assembled and tested, which facilitates construction, tuning, and general Transmitter maintenance.
1.4 VT-4R400 Transmitter Family Models There are four distinct models in the UT-4R400 Transmitter family each with different bands of operation and power outputs. The four models are as follows: • VT-4R140-2 • VT-4R140-8 • VT-4R160-2 • VT-4R160-8 - 136-150 MHz band, - 136-150 MHz band, - 150-174 MHz band, - 150-174 MHz band, 0.5-2.0 Watt 2.0-8.0 Watt 0.5-2.0 Watt 2.0-8.0 Watt The transmitters' band of operation is determined by select components in the amplifier. 1.5 Performance Specifications 1.5.
Front Panel Controls: NORM (repeat mode), OFF, and KEY TX (Tx on). MIC MODE: ANALOG and DIGITAL. PTT Activation: • Active to ground; Microphone activated; • Front Panel switch: KEY TX PTT Time-Out-Timer: Programmable from 1 sec. to 8 hrs. (default 5 min.), using Radio Programming Software package. Channel Spacing: 12.5 kHz or 25 kHz. Frequency Stability: Standard: ±2.5 ppm, -30°C to +60°C. Channel Selection: In 5.0 or 6.25 kHz increments selected with Radio Programming Software package.
1.5.3 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: 1.4 kg (3.0 lbs.) Corrosion Prevention: Anodized aluminum construction. Stainless steel hardware. Selectively conformal coated glass epoxy 2 and 4 layer printed circuit boards. Gold plated module connectors. Module Design: Compact Eurostandard modular design. Plug-in modules mate with Daniels standard M3 repeater subrack.
2 2.1 THEORY OF OPERATION General An VT-4R150 Transmitter is constructed using two primary modules: the MT-4 Digital Transmitter Main Board and the VT-4 Amplifier Board. The Main Board supports two plug in modules: the Digital Signal Processor Board and the Transceiver RF Board. The Digital Signal Processor Board also supports another module, the Microprocessor Board.
2.3 High Speed Serial Interconnect Fully compliant Project 25 operation will be supported by the transmitter via a firmware upgrade. At that time, IC U4 will be enabled. It provides a high speed bi-direction LVDS (Low Voltage Differential Signaling) port on front panel jack J1. Each signal path uses a balanced current loop to achieve high serial bit rates with low noise. These signaling paths will provide a means for digital and analog RF signals to be passed from receiver to transmitter for repeating. 2.
2.7.1 Channel Select Line Mapping The table below shows the relationship between the states of the channel select lines. Note that the channel select lines follow a binary pattern, but that the binary “0” represents channel 1. CSEL3 LO LO LO LO LO LO LO LO HI HI HI HI HI HI HI HI 2.
JU24 JU25 JU26 JU27 JU28 JU29 JU30 JU31 JU32 JU33 JU34 JU35 JU36 JU37 JU38 JU39 JU40 JU41 JU42 JU43 JU44 JU45 JU46 JU47 JU48 JU49 JU50 2.
OUT OUT OUT OUT OUT OUT OUT IN IN IN OUT OUT OUT OUT IN OUT OUT IN IN OUT OUT OUT IN OUT IN OUT IN OUT 2.25 sec 2.5 sec 2.75 sec 3 sec 3.25 sec 3.5 sec 3.75 sec 2.10 Kerchunk noise selection In addition to the selectable hang timer, it is possible to add a burst of noise to the end of each transmission, after the hang time has expired.
2.12 Connector Pinouts 2.12.1 Connector J9 A dual, 8 position RJ-45 jack is mounted on the Connector Board so as to be accessible from the receiver’s front panel. The pins of each of the two jacks are wired identically. The following are the connections on J1. Pin 1 2 3 4 5 6 7 8 Signal LH_DATA AUDIO ANALOG_COR* LVDS DATA+ LVDS DATADIGITAL_COR* +8.8VDC TO RPIM SB9600_BUSY 2.12.
Transmitter settings are divided into two categories, Radio Wide options, which apply at all times, and Channel Wide options, which can be programmed differently for each channel. When the Transmitter menu is selected from the main screen, both the Radio Wide and Channel Wide options for the current channel are displayed. The RSS may be used to save a Transmitter configuration to disk.
These selected Timeouts can then be used in the Timeout Value field in each Transmitter Channel Setting. These fields are used to program the parameters for a single Transmitter channel only. There are 32 different available channels labeled A1 - A16 and B1 - B16. The parameters for each channel are independent of parameters in other channels. 2.13.2 Channel Wide Settings The Receiver may be programmed with up to 32 channels, each with a different frequency, channel spacing and modulation type.
2.13.2.6 Audio Pre-emphasis For analog channels, the standard 6 dB/octave pre-emphasis curve may be either disabled or applied to the transmitted audio. Pre-emphasis is applied to audio from the Unbalanced Audio Input, the microphone input, and the audio input on the CNTL BUS jack on the front panel. 2.13.2.7 Timeout Value This option allows selection of one of four preset timeout timer values.
2.13.2.11 Analog Signaling Settings: CTCSS Tone This field allows selection of any of 42 EIA CTCSS tones. 2.13.2.12 Analog Signaling Settings: Reverse Burst For CTCSS channels only: When this field is set to “Enabled”, each transmission is terminated with a short burst of CTCSS tone with its phase reversed 180 degrees. This allows suitably equipped receivers to squelch their audio circuits before the transmitted carrier is dropped, giving a silent squelch operation. 2.13.2.
3 Transmitter Assembly and Adjustment The Transceiver RF and Digital Signal Processor module are mounted on the Transmitter Main Board, and the Microprocessor board plugs into the Digital Signal Processor Board. Two ribbon cables allow the Microprocessor board to make connection with the Main board. A metal shield is soldered in place over the Transceiver RF module, and another shield is held in place over the Digital Signal Processor and Microprocessor boards by screws.
3.3 Major Frequency Change Changes greater than ± 1 MHz from a previously tuned transmit frequency will require RF Amplifier alignment as per the UHF Amplifier Instruction Manual. The Digital Transmitter Signal Processor Board, once programmed for the new frequency, should not require any alignment, as it is capable of operation over the entire band from 406-470 MHz. 3.
measured by the frequency counter matches the test frequency displayed on the screen to within +/- 150 Hz. Click on the "UPDATE SOFTPOT" button to save the setting in the transmitter's non-volatile memory. This completes the adjustment of the reference oscillator. Leave the Transceiver RF Board disconnected from the amplifier module and continue with the next alignment procedure. 3.4.
the transmitter should be connected to a service monitor set to monitor the deviation of the carrier signal generated by the transmitter. Key the transmitter by moving the front panel power switch to the “KEY” position and adjust pot R11 to achieve a deviation of 3 kHz (for a 25 kHz wide channel) or 1.5 kHz (for a 12.5 kHz wide channel). Next, de-key the transmitter and remove the audio signal generator. Connect the signal generator to microphone connector MIC1-2.
3.7 Printed Circuit board Numbering Convention To ease troubleshooting and maintenance procedures, Daniels Electronics Limited 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. For example: • PCB number 43-912010 indicates circuit board version 1.0; • PCB number 50002-02 indicates circuit board version 2.0. All PCB's manufactured by Daniels Electronics are identified by one of the above conventions.
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4 4.1 Repeater System Configuration Interim Repeater The MT-4 series Project 25 Interim Digital Receivers will typically be used in a low current repeater configuration with MT-4 series Project 25 Interim Digital Transmitters. In its Interim mode of operation, the receiver can demodulate both FM analog and Project 25 digital signals to baseband audio. This audio can be passed to the Transmitter, where it can be remodulated as either a FM analog or Project 25 digital signal.
4.1.1 Repeater Interconnect Cable Pinout The cable which is used to interconnect the receiver to a MT-4 Interim Transmitter connects receiver audio and the ANALOG_COR* and DIGITAL_COR* signals to corresponding points in the transmitter. The cable pinout is shown below. Signals shown in brackets are present on the cable, but not used by either the receiver or transmitter for repeater operation. Receiver End Pin No. 1 2 3 4 5 6 7 8 Shield 4.
separate control of their channel select lines, so changing receiver channels does not affect the transmitter channel. Q: Why is the transmitter staying on after the receiver signal is removed? A: The transmitter has a hang timer that keeps it keyed after the receiver signal disappears. This can be used to keep a chain of repeaters up between transmissions. The delay is adjustable from 0 to 3.75 seconds.
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5 5.1 ILLUSTRATIONS Digital Repeater Transmitter Front Panel P25 TRANSMITTER FACTORY SET OPERATING FREQUENCY FREQUENCY (MHz) ANALOG TRANSMIT LED 132.0000 A D NORM OFF KEY TX ANALOG DIGITAL ON / OFF / KEY SWITCH MICMODE MICROPHONE MODE SELECTION SWITCH DIGITAL TRANSMIT LED CNTL BUS RJ45 CONNECTOR MIC B RF OUT TYPE N RF INPUT JACK DANIELS ELECTRONICS LTD.
5.2 Digital Repeater Transmitter Exploded View C C C DIGITAL SIGNAL PROCESSOR BOARD SHIELD G C DIGITAL SIGNAL PROCESSOR PCB C G G H DIGITAL TRANSMITTER TRANSCEIVER RF PCB D de Sli lot os nt Bi 4 PC B D B DIGITAL TRANSMITTER MICROPROCESSOR PCB B B D TRANSMITTER 14 HP CASE A D Instructions A 1. Remove the four screws (B) on the side of the Transmitter Case. E E 2. Remove the four Front Panel screws (A). 3. Remove the Transmitter Case. F 4.
5.3 Digital Repeater Transmitter Block Diagram (Interim Mode) FRONT PANEL KEY TX B6 +9.5VDC +9.5V OUTPUT NORM +9.5 VDC SW1 KEY TX Z6 RJ45 CONNECTOR J3 JU18 POWER TO RPIM JU17 DIGITAL COR JU14 TRANSCEIVER RF BOARD ANALOG COR A/D MIC MODE JU12 POWER LH_DATA B2 J7 JU19 TO ALL +13.8 V SUPPLY POINTS +13.8 VDC 8.
5.4 Digital Repeater Transmitter Schematic Diagram C1 10uF C2 1.0uF LPF2 LPF C5 100nF Vout 1 Sense 2 3 Sd 4 Gnd 5V Tap 6 FB 7 LPF10 R2 82K5 C3 10nF 5.0V R1 15K0 R3 10K0 +9.5VIN C7 C8 10uF 1.0uF B6 KEY TX 1 LPF NORM 3 +9.5V LPF4 P1 Z6 Z6 PTT * P1 B10 P1 Z10 B10 LPF D2 BAS16 5.0V Z10 C9 1.0uF MIC1 MICROPHONE 1 C18 1nF C12 C13 8.0V 100nF 1.0uF R14 10K0 P1 P1 Z18 C14 100nF AUDIO B18 2 3 4 5 6 7 8 9 R13 15K0 R9 5K0 1 4 3 6 5 8 7 10 9 R12 1K0 8.
5.5 Digital Repeater Transmitter Main Board Component Layout (Bottom) 13.8V TRANSCEIVER RF SHIELD 9.5V ENA* PRESS NUT (x6) OPPOSITE SIDE OF PCB PRESS NUT (x9) PRESS NUT (x9) PRESS NUT (x9) PRESS NUT (x9) PRESS NUT (x9) P1 48 PIN F-TYPE 8.9V PRESS NUT (x9) GND PRESS NUT (x9) PRESS NUT (x9) PRESS NUT (x9) PRESS NUT (x6) PRESS NUT (x6) PRESS NUT (x6) J2 GND REV FOR PCB 50062-06 DANIELS TM xT4DM5B VICTORIA B.C . ELECTRONICS LTD. DANIELS TM ELECTRONICS LTD.
5.6 Digital Repeater Transmitter Main Board Component Layout (Top) LED1 Digital Signal Processor Shield SW1 SW2 J4 20 PIN RIGHT ANGLE HEADER J9 J11 20 PIN RIGHT ANGLE HEADER J3 20 PIN RIGHT ANGLE HEADER MIC1 Installed Jumper Not installed Jumper PCB 50062-06 DANIELS TM ELECTRONICS LTD.
5.7 Digital Repeater Microprocessor Board Component Layout (Bottom) PCB 50090-03 J13 J15 20 PIN HEADER J14 20 PIN RIGHT ANGLE HEADER J6 20 PIN RIGHT ANGLE HEADER D DANIELS ELECTRONICS DANIELS ELECTRONICS xT4DM7B VICTORIA B.C . TITLE.:DIGITAL DIGITAL REP. MICROPROCESSOR BD SMT DESIGN. (BOT.) TITLE: DATE.: DIGITAL REP. RX ADAPTER ADPATER TXTX MICROPROCESSOR BOARD SM TH OUTLINE DESIGNATIONS LAYOUT DESIGNATIONS BOARD BD TH DESIGNATIONS SMT TH LAYOUT LAYOUT (BOTTOM) (BOTTOM) (BOTTOM) DATE.
5.8 Digital Repeater Microprocessor Board Component Layout (Top) Note: JU38 should be removed after U6 is programmed. RP1 JU50 JU49 100K0 JU43 R18 1K0 JU44 C23 1.0uF JU48 JU45 JU47 R25 10K0 JU46 JU41 JU38 R24 10K0 C25 22pF U6 C24 22pF JU42 68HC811E2 C27 100nF R26 10M0 C26 4.
6 PARTS LIST 6.1 Digital Repeater Transmitter Main Board Parts List 6.1.1 Digital Repeater Transmitter Main Board Electrical Parts List Ref Desig Description Part No. C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11, C12 C13 C14, C15 C16 C17 C18, C19 C20 C21 C22 CAP., SM, 10uF TANT., 20%, 35V CAP., SM, 1.0uF TANT., 20%, 35V CAP., SM, 10nF CER,0805,X7R,50V CAP., SM, 4.7uF TANT., 10%, 16V CAP., SM, 100nF CER., 0805, X7R, 50V CAP., SM, 4.7uF TANT., 10%, 16V CAP., SM, 10uF TANT., 20%, 35V CAP., SM, 1.0uF TANT.
Ref Desig Description Part No.
Ref Desig Description Part No. R17 R19 R20 R21 R22, R23 R34 R35 R36 R37 R38, R39 R40, R41 R42 R43 - R46 R47 – R51 R52 R53, R54 R55 – R57 R58 – R62 R63 – R65 R66, R67 R68 R69 R70 R71, R72 R73 R74 R75 – R83 R84 R85, R86 R87 R88, R89 R90, R91 R92 R93, R94 R95 R96 - R98 R99 R100 R101 R102 R103 R104 R105 RES., SM, 56R2 1206, 1%,100ppm RES., SM, 825R 1206, 1%,100ppm RES., SM, 10K0 0805, 1%,100ppm RES., SM, 825R 1206, 1%,100ppm RES., SM, 10K0 0805, 1%,100ppm RES., SM, 100K0 0805, 1%,100ppm RES.
6.1.2 Digital Repeater Transmitter Main Board Mechanical Parts List Description Part No. Qty. CABLE, CUSTOM, RJ45P-RJ45P, 20CM CABLE, CUSTOM, RJ45P-RJ45P, 50CM CABLE STRIP,2x10 DUAL SOCK.,3" CABLE,SMB PL-SMB PL,RG316,RA-STR CBLC46-12506020 CBLC46-12506050 5029-C10D030N $7910-WP0WSO12 1 1 2 1 CASE, 14HP RF PLUG-IN, MT-3 TX 3702-62502010 1 COAX, CONFORMABLE,50 OHM,0.083, 2.2cm COAX, CONFORMABLE,50 OHM,0.083, 3.
Description Part No. Qty. SPACER, 5mmOD, 6mm L,M2.5 SPACER, 5mmOD,5.2mmL,2.6mmHOLE 5920-5A0600C01 5920-5A052C01 4 1 TERMINAL, CRIMP, FEM.,22-24,Au,MOLEX 16-02-0103 5021-TF22B002 4 TUBING, PVC-105C, 8 AWG, CLEAR, 10cm 7602-105C08CL 1 WIRE, PVC/STRAND., 22AWG, BLUE, 16cm WIRE, TFE/STRAND., 24AWG, ORG., 14cm WIRE, PVC/STRAND., 22AWG, ORG., 15cm WIRE, TFE/STRAND., 24AWG, RED, 14cm WIRE, PVC/STRAND., 22AWG, RED, 19cm WIRE, TFE/STRAND., 24AWG, VIO., 14cm WIRE, PVC/STRAND.
Ref Desig Description R31 R32 R33 R35 RES., SM, 10K0 0805, RES., SM, 10K0 0805, RES., SM, 10K0 0805, RES., SM, 10K0 0805, RP1 RES., SIP, 100K0 2%,10PIN,#1COM 1160-5B104G10 U1 IC, 68HC811E2, MIC/CTR, PLCC52 2380-68811P52 X1 RESONATOR, SM, 8.0MHz, CERAMIC 1575-8001816A 6.2.2 Part No. 1%,100ppm 1%,100ppm 1%,100ppm 1%,100ppm 1150-4A1002FP 1150-4A1002FP 1150-4A1002FP 1150-4A1002FP Digital Transmitter Additional PCBs Ref Desig Description Part No.
7 REVISION HISTORY ISSUE DATE DESCRIPTION AND (REASON) 1 • First Issue July 00 DANIELS DEELECTRONICS VT-4R150 VHF Project 25 Digital Transmitter Instruction Manual 7-1
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