User's Manual

iii

12/1/01 68P80801D55-A

Module Replacement Procedures page 32..............................................

General Replacement Information page 32......................................................

Replacing Station Internal Power Amplifier Module page 34.......................................

Replacing High Power Booster PA Deck page 35................................................

Replacing High Power Booster PA Deck Front Panel page 36......................................

Replacing Exciter Module page 37.............................................................

Replacing Station Internal Power Supply Module page 38.........................................

Replacing High Power Booster Power Supply Module(s) page 39..................................

Replacing Station Control Module page 40......................................................

Replacing Wireline Interface Board page 44.....................................................

Replacing Receiver Module and/or Preselector Assembly page 46.................................

Replacing ASTRO Modem Card page 48........................................................

Replacing Station Backplane Board page 49....................................................

Replacing High Power Booster Power Supply Backplane Board page 50............................

Replacing Charger Control Board page 51......................................................

Preselector Field Tuning Procedure page 52............................................

Required Test Equipment page 52.............................................................

VHF Tuning Procedure page 53...............................................................

STATION MODULES

RECEIVER CIRCUITRY

RECEIVER MODULE (VHF Ranges 1 and 2; Includes Preselector) 68P81086E28.........

Description page 1....................................................................

General Description page 1....................................................................

Overview of Circuitry page 1...................................................................

Controls, Indicators, and Inputs/Outputs page 2........................................

Functional Theory of Operation page 3.................................................

Synthesizer and VCO Circuitry page 3...........................................................

Preselector Filter Assembly page 4.............................................................

Receiver Front End Circuitry page 4.............................................................

Custom Receiver IC Circuitry page 4............................................................

Address Decode and A/D Converter Circuitry page 5..............................................

Voltage Regulator Circuitry page 5..............................................................

RECEIVER MODULE (800 MHz) 68P81086E76.........................................