User's Manual

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11/15/00 68P80801D55-O
Module Replacement Procedures page 19..............................................
General Replacement Information page 19......................................................
Replacing Power Amplifier Module page 21.....................................................
Replacing Exciter Module page 22.............................................................
Replacing Power Supply Module page 23.......................................................
Replacing Station Control Module page 24......................................................
Replacing Wireline Interface Board page 30.....................................................
Replacing Receiver Module and/or Preselector Assembly (VHF and UHF) page 32...................
Replacing Receiver Module (800 MHz and 900 MHz) page 33.....................................
Replacing  Modem Card page 34........................................................
Replacing Backplane Board page 35...........................................................
Preselector Field Tuning Procedure page 36............................................
Required Test Equipment page 36.............................................................
VHF Tuning Procedure page 37...............................................................
UHF Tuning Procedure page 40...............................................................
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..............................................................
TRANSMITTER CIRCUITRY
EXCITER BOARD (VHF, UHF, 800/900 MHz) 68P81086E24..............................
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...........................................................
RF Switch Circuitry page 4.....................................................................
Microprocessor Circuitry page 4................................................................
TX Power Control Circuitry page 5..............................................................
VHF POWER AMPLIFIER MODULE (25W R2) 68P810xxxxx................................
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.................................................
RF Signal Path page 3........................................................................
Output Power Control page 3..................................................................
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