Midland 91-4050-91-4100 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 MODELS
VHF HIGH BAND
UHF BAND
Part Number: 680-100-2049
Revision A
1/12

Midland 91-4050-91-4100 Specifications

General

Brand	Midland
Model	91-4050-91-4100
Category	Accessories
Language	English

Summary

ACRONYMS AND ABBREVIATIONS

SPECIFICATIONS -VHF

SPECIFICATIONS -UHF

OPTIONS & ACCESSORIES

Alignment Procedures

RECEIVER (RX MAIN UNIT) Alignment

EXCITER (TX MAIN UNIT) Alignment

FRONT PANEL UNIT Alignment

VR401 Alignment

Sets volume, noise squelch, and backlight levels.

Transmitter Power Adjustments

Adjusts Hi-Power and Low-Power transmitter output levels.

Circuit Description

Low Current Improvements

Details modifications for reduced standby current consumption.

Receiver Unit Circuitry

Description of the receiver unit's sections and components.

Exciter and Power Amplifier Circuitry

Logic and Control Unit Circuitry

Analog and Digital Logic Units

Details Analog Logic Unit (CPU, EEROM, Audio) and DSP Unit.

Frequency and Emission Control Circuits

Covers frequency stabilization and spurious emission limiting.

FRONT PANEL UNIT Description

REMOTE CONTROL

Block Diagram VHF 60 Watt

Chassis Exploded View

Parts List

COMPONENT MODULES

List of component modules with part numbers.

FRONT PANEL UNIT Parts

ANALOG LOGIC UNIT Parts

RX Main Unit VHF"B" Parts

REPLACEMENT PARTS ORDERING