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Manuals
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Radio Shack Manuals
Transceiver
HTX-245
Service manual
Radio Shack HTX-245 Service Manual
Mini hamndheld 2m/70cm fm amateur transceiver
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Contents
Specifications
Test Condition
Disassembly Instructions
To Remove the Clip
To Remove the Battery Cover
To Access the RF and Control Board from Cover
To Access the Board Section
To Reassemble
Block Diagram
Theory of Operation
Transmitter
Microphone Audio Input Circuit
UHF Mode Transmitter Stage and Harmonic Filter
RX/TX Voltage Controlled Oscillator Module
Uhf Rx Vco
Vhf Rx Vco
Uhf Tx Vco
Receiver
Loop Filter
PLL Frequency Synthesizer
Phase Detector
RF Amplifier
First Mixer and First if Amplifier
Second Mixer, Second if and FM Detector
AF Amplifier and Filtering
Microprocessor Controller
CTCSS/DTMF Encode and Decode Circuit
CTCSS Receive
CTCSS Transmit
Alignment Instructions
Alignment Test Points and Parts Locations
Phase Locked Loop
Test Equipment Required
Alignment Procedure
Transmitter Section
Receiver Section
Troubleshooting Hints
Error Display
Wiring Diagram
Printed Circuit Board
Digital PCB: Top View
Digital PCB: Bottom View
RF: Top View
RF: Bottom View
RF PCB: Top View
RF PCB: Bottom View
Vco Pcb
Rx Pcb
Exploded View
Exploded View Parts List
Electrical Parts List
Semiconductor Voltage Chart
RF Board Function
VCO Module Function
Power Function
Back Light Function
Audio Input Function
Tone Squelch Function
Semiconductor Lead Identifcation
IC Internal Connection
Schematic Diagrams
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