Midland 91-1060-91-1110 User Manual

SERVICE MANUAL ADDENDUM P25/FM TWO-WAY LAND MOBILE RADIO BASE TECH III BASE/REPEATER STATION 91-1060-91-1110 91-4050-91-4100 LOW CURRENT MO

Alignment Procedures Low Current Base Tech 3.5 RECEIVER (RX MAIN UNIT) 1. Pre-selector and Post-selector Tuning Both selectors have been pre-tuned

Alignment Procedures Low Current Base Tech 3.5 FVR001 Tight SquelchFVR002 De-mod Bias Figure 1: Receive Module (RX Main Unit) Alignment Adjust

Alignment Procedures Low Current Base Tech 3.5 EXCITER (TX MAIN UNIT) 1) FVR201 Sub-Audible Modulation Balance This potentiometer sets modulation

Alignment Procedures Low Current Base Tech 3.5 6) Electronic Transmitter Alignment The station must first be put into “Adjust Mode.” TP2 Align

Alignment Procedures Low Current Base Tech 3.5 8) Maximum Analog Deviation Limiting Alignment (Base Station and Repeater) a) Press the “#” key o

Alignment Procedures Low Current Base Tech 3.5 11) CTCSS Deviation Alignment a) Press the “#” key on the Front Panel until the second line of the

Alignment Procedures Low Current Base Tech 3.5 FRONT PANEL UNIT 1) VR40ce and Noise Squelch can be set. t. n be set. 2) FThis potentiometer all

Circuit Description Low Current Base Tech 3.5 LOW CURRENT IMPROVEMENTS In order to improve standby current consumption the Receiver Unit, Transmitter

Circuit Description Low Current Base Tech 3.5 EXCITER UNIT 1) VCO Section The oscillator circuit generates transmitter frequency. Then this signal

Circuit Description Low Current Base Tech 3.5 DESCRIPTION OF CIRCUITS TO STABILIZE TX AND RX FREQUENCY The transmitter and receiver each use a TCVXO

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Circuit Description Low Current Base Tech 3.5 FRONT PANEL UNIT 1) LCD Display Section LCD display is constructed by 20 characters x 4 lines. Each c

Circuit Description Low Current Base Tech 3.5 REMOTE CONTROL A 25-pin D-sub connector for remote control is provided on the rear panel of Base Tech I

Circuit Description Low Current Base Tech 3.5 Notes: © 2012 Midland Radio Corporation 18

Block Diagram VHF 60 Watt Low Current Base Tech 3.5 19 © 2012 Midland Radio Corporation

Block Diagram VHF 110 Watt Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 20

Block Diagram UHF 50 Watt Low Current Base Tech 3.5 21 © 2012 Midland Radio Corporation

Block Diagram UHF 100 Watt Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 22

Front Panel Unit Schematic Low Current Base Tech 3.5 23 © 2012 Midland Radio Corporation

Analog Logic Unit Schematic Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 24

VHF RX Main Unit Schematic Low Current Base Tech 3.5 25 © 2012 Midland Radio Corporation

TABLE OF CONTENTS Manual Supplement Information ii Table of Contents iii Acronyms and Abbreviations iv GENERAL INFORMATION Specifications

VHF RX VCO Unit Schematic Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 26

VHF TX Main Unit Schematic Low Current Base Tech 3.5 27 © 2012 Midland Radio Corporation

UHF RX Main Unit Schematic Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 28

UHF RX VCO Unit Schematic Low Current Base Tech 3.5 29 © 2012 Midland Radio Corporation

UHF TX Main Unit Schematic Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 30

Front Panel Unit Layouts Low Current Base Tech 3.5 31 © 2012 Midland Radio Corporation

Analog Logic Unit Layouts Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 32

VHF RX Main Unit & RX VCO Unit Layouts Low Current Base Tech 3.5 RX Main Unit Top Side RX Main Unit Bottom Side RX VCO Unit Top Side R

VHF TX Main Unit Layouts Low Current Base Tech 3.5 TX Main Unit Top Side TX Main Unit Bottom Side © 2012 Midland Radio Corpo

UHF RX Main Unit & RX VCO Unit Layouts Low current Base Tech 3.5 RX Main Unit Top Side RX Main Unit Bottom Side RX VCO Unit Top Side RX

ACRONYMS AND ABBREVIATIONS Below is a list of common electrical abbreviations used in documentation. CTCSS --------------------- Continuous Tone-

UHF TX Main Unit Layouts Low Current Base Tech 3.5 TX Unit Top Side TX Unit Bottom Side © 2012 Midland Radio Corporation 36

Chassis Exploded View Low Current Base Tech 3.5 1. PA Unit Chassis 2. Mounting Plate 3. Heat Sink Assy 4. Bottom Cover 5. Right Side Assy 6. Left Si

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Palm Microphone Schematic Low Current Base Tech 3.5 39 © 2012 Midland Radio Corporation

Parts List Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 40 COMPONENT MODULES Exploded View # (see page 47) Description Part # 8 Fr

Parts List Low Current Base Tech 3.5 41 © 2012 Midland Radio Corporation FRONT PANEL UNIT INTERGRATED CIRCUITS BAJ2DD0WT IC401 TDA1519C IC402 X

Parts List Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 42 FRONT PANEL UNIT (CONT.) CONNECTORS 00-6200-520-330-000+ CN402, CN403 0

Parts List Low Current Base Tech 3.5 43 © 2012 Midland Radio Corporation ANALOG LOGIC UNIT (CONT.) CAPACITORS (CONT.) EECS5R5H105 C10 GRM216B11C1

Parts List Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 44 ANALOG LOGIC UNIT (CONT.) MISCELLANEOUS RCTCTE TP1, TP2, TP3 ERTJ1VT222JA

Parts List Low Current Base Tech 3.5 45 © 2012 Midland Radio Corporation RX MAIN UNIT VHF”B” (CONT.) CAPACITORS (CONT.) GRM1882C1H120JA01D C837

General Information Low Current Base Tech 3.5 SPECIFICATIONS -VHF General Frequency Range: A Band: 136-156 MHz, B Band: 146-174 MHz Number of

Parts List Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 46 RX VCO UNIT VHF “B” INTERGRATED CIRCUITS UPC1688G-T1 IC301 TK70008 IC3

Parts List Low Current Base Tech 3.5 47 © 2012 Midland Radio Corporation TX MAIN UNIT VHF”B” (CONT.) TRANSISTORS 2SK3018-T106 Q201, Q205, Q209

Parts List Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 48 TX MAIN UNIT VHF”B” (CONT.) RESISTORS (CONT.) MCR10EZHJ 391 R250 MCR18

Parts List Low Current Base Tech 3.5 49 © 2012 Midland Radio Corporation RX MAIN UNIT UHF "A" (CONT.) INDUCTORS (CONT.) #3079 L862, L

Parts List Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 50 RX MAIN UNIT UHF "A" (CONT.) CONNECTORS CRS5001-0801F TP801 52

Parts List Low Current Base Tech 3.5 51 © 2012 Midland Radio Corporation RX VCO UNIT UHF "A" (CONT.) MISCELLANEOUS RCT TP301 LPC-2T7M+

Parts List Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 52 TX MAIN UNIT UHF "A" (CONT.) RESISTORS MCR03EZHJ 000 R200, R2

Parts List Low Current Base Tech 3.5 53 © 2012 Midland Radio Corporation RX MAIN UHF "B" (CONT.) TCXO/ CRYSTAL FILTER C-TYPE 0.5ppm

Parts List Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 54 RX MAIN UHF "B" (CONT.) MISCELLANEOUS SE-3 X 6 PCB SEMS SCRE

Parts List Low Current Base Tech 3.5 55 © 2012 Midland Radio Corporation TX MAIN UHF "B" INTERGRATED CIRCUITS BD3931FP IC201 XC6202P70

General Information Low Current Base Tech 3.5 SPECIFICATIONS -UHF General Frequency Range: A Band: 400-435 MHz, B Band: 440-475 MHz C Band: 465-

Parts List Low Current Base Tech 3.5 © 2012 Midland Radio Corporation 56 TX MAIN UHF "B" (CONT.) RESISTORS MCR03EZHJ 000 R200, R209, R

Parts List Low Current Base Tech 3.5 57 © 2012 Midland Radio Corporation REPLACEMENT PARTS ORDERING To speed delivery and avoid errors, ha

5900 PARRETTA DRIVE • KANSAS CITY • MISSOURI • 64120 PHONE: (816) 241-8500 • FAX: (816) 241-5713 www.midlandradio.com

General Information Low Current Base Tech 3.5 OPTIONS & ACCESSORIES 71-7220B 30 AMP Rack-mount Power Supply 220/110VAC 71-1230BM Batte

General Information Low Current Base Tech 3.5 71-8885AC Option Shelf with Slides / Easy Access & AC Supply with Battery Charge 71-8885D

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