Midland Radio 70201BD UHF Transceiver User Manual SERVICE MANUAL

Midland Radio Corporation UHF Transceiver SERVICE MANUAL

users manual

1 SERVICE MANUAL RF DATA LINK RADIOS 70-101BD 70-201BD Important Information
2 All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language without the written permission of Midland Radio Corporation No part of any copyrighted computer programs contained in the products referred to in this manual may be copied or reproduced without the express written consent of Midland Radio Corporation Midland Radio Corporation reserves the right to change the products described in this manual without prior notice. © Midland Radio Corporation This manual is designed to facilitate the set-up and service of the Midland 70-101BD and 70-201BD RF Data Link Radio series. As necessary, service manual supplements will be published and distributed on the following forms: Manual Addition (MA)……………For supplemental information useful in product service or improvement. Printed on BLUE paper. Change Notice (CN)……………For details about changes made during production by model and serial number. Printed on YELLOW paper. Manual Correction (MC).......For correcting literature errors not related to production changes. Printed on GREEN paper. Technical Bulletin (TB)..........For solutions to field problems and tips for performance improvement. Printed on PINK paper.
3 Comments or suggestions concerning areas of manual improvement are welcome.
4 TABLE OF CONTENTS Manual Supplement Information.....................................................................ii Table of Contents...........................................................................................iii Acronyms and Abbreviations.........................................................................iv GENERAL INFORMATION Specifications ...................................................................................................1-3 PREPARATION Test Equipment ................................................................................................4 Alignment Points...............................................................................................5 Complete Realignment......................................................................................6-7 CIRCUIT DESCRIPTION Description.......................................................................................................8-11 SERVICE Maintenance and Repair ..................................................................................12-13 Trouble shooting guide......................................................................................14 Voltage Charts..................................................................................................15-18 Component Pinout ............................................................................................19-22 DIAGRAMS Block Diagram..................................................................................................23 Wiring Diagram.................................................................................................24 TCXO Schematic..............................................................................................24 VCO (148-174MHz) Schematic..........................................................................25 VCO (440-470MHz) Schematic..........................................................................25 Front End (148-174MHz) Schematic ..................................................................26 Front End (440-470MHz) Schematic ..................................................................26 PA (148-174MHz) Schematic ............................................................................26 PA (440-470MHz) Schematic ............................................................................26 RF Board (148-174MHz) Schematic...................................................................27 RF Board (440-470MHz) Schematic...................................................................28 Digital Board Schematic....................................................................................29 RF Board View (148-174MHz) Layout ................................................................30 RF Board View (440-470MHz) Layout ................................................................31 Digital Board View Layout .................................................................................32 70-101/201BD Exploded View...........................................................................33 PARTS 70-101BD RF Board Parts List...........................................................................35-38 70-201BD RF Board Parts List...........................................................................39-42 Digital Board Parts List......................................................................................43-45 Replacement Parts Ordering .............................................................................46
5 ACRONYMS AND ABBREVIATIONS Below is a list of common electrical abbreviations used in documentation. CTCSS----------------------- Continuous Tone-Controlled Squelch System DCS(or CDCSS) ---------- Continuous Digital-Controlled Squelch System EEPROM ------------------ Electrically Erasable Programmable Read Only Memory MIL SPEC ------------------ Military Specification RX --------------------------- Receive TX --------------------------- Transmit SINAD ---------------------- The ratio in decibels of signal + noise + distortion to noise + distortion VCO ------------------------ Voltage Controlled Oscillator TCXO ---------------------- Temperature Controlled Crystal Oscillator PLL ------------------------- Phase Locked Loop Installation and Setup Information for 70-101BD and 70-201BD Data Link Radios. Transmit/Receive channels are chosen from the frequencies programmed by switches inside the cover. Refer to the channel data list and set DIP switches for the desired frequency.
6 All connections to the unit are made through the DB9 connector. Connect wiring according to the diagram below. Connections to DB-9 connector: 1. Mod in (data). Audio sensitivity is 100mV RMS @ 60% Peak deviation. 2. AF out (data) (0.25 volt rms) 3. PTT . Ground to transmit. 4. GND 5. V in . 9-18 VDC 6. Busy Detector 0 volts DC = busy, 5 volts DC = open 7. Audio/Mic in. Sensitivity 5 mV. Typ. 8. Switch 9. Spkr out. 1 V. rms. typ. to 8 ohm load. PS current: Power save 15-30 mA. typ. Standby 30-50 mA. typ. Receive 35-60 mA. typ. Transmit Low power 400-650 mA. typ. Transmit High power 1100-1800 mA. typ. How to Program 70-x01BD. Requirement : PC running DOS or Windows 95/98, 70-1410K kit including: Programing box, Programming Cable, and Software on one 3.5 disc. (Optional: dot matrix printer) Connection Diagram Programming cable Com port
7 PC Programming box 1. Install ACC900 by copying ACC900.exe to your PC or running it from the floppy disk. 2. Connect the 70-x01 Unit through the Programming box and cable to the PC .(See Connection Diagram) 3. Run Acc900.exe and select Band, 70-101BD VHF or 70-201BD UHF. 4. After selecting Band, Press Enter. The screen will show 5. On first operation you will need to set the Com Port and path to data files before beginning to program radios. 6. To read radio channel data from a unit, first push box switch ON (DOWN). Second you must select read radio from the software then Push Switch READ and wait for the download to complete. If everything is OK Red LED will show while reading. The screen will show: 70-x01BD SUPPLY 12 V DC ON/OFF WRITE READ Radio Model 70-101BD VHF 70-201BD UHF Setup & Select Data Source 1. Select Comunication Port 2. Read Radio 3. Set Path to Data Files 4. Read Existing File 5. Restore Last File 6. Create New File 7. Delete a File 8. Exit Programming Radio Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Programming : Reading Word xx
8 Numbers following “Reading Word” will roll until the read is complete. The LED will turn off, the screen will prompt that programming is complete, and the channel list will display. (In some cases * this box will be blank.) 7. You can change the channel data two ways. You can create a new frequency file by selecting Create New file from Setup & Select Data source menu or by reading from the unit and modifying the frequency that you want. To upload the changes verify that power switch is still Down (ON). Press Right Arrow Key to select Features Window and select 4. Program/Print/Save. The next Window is as below Select Program Radio and push Write Switch. The Red LED will light followed by the display of the screen as below The numbers following “Writing Word” will roll until LED is off and programming is complete. (In some cases * this box will be blank.) Notes: * in Windows 95/98 use ALT+ENTER to change to full screen display from window display. Box contents will show. Program/Print/Save 1. Program Radio 2. Program & Verify 3. Print Data 4. Save Data to Disk 5. Change Data Programming Radio Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Programming : WRITING Word xx
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