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General| Brand | Kenwood |
|---|---|
| Model | TH-22AT |
| Category | Transceiver |
| Language | English |
Instructions for disassembling the transceiver's outer casing.
Procedure for detaching internal units from the transceiver chassis.
Steps to safely detach the main circuit board from the unit.
Overview of frequency setup, receiver path, RF amplifier, and mixer stages.
Details on IF/AF amplification, squelch, mute functions, and S-meter.
Explanation of transmitting stages, modulation, APC, and output control.
Description of PLL, VCO, unlock detection, and digital control interfaces.
Details on power supply, battery saving modes, and tone control circuits.
Pinout and block diagrams for microprocessor and DTMF receiver ICs.
Details on EEPROM, AF amplifier, microphone amplifier, and PLL ICs.
Pinouts and diagrams for DC-DC converter, power module, and voltage detector.
Detailed descriptions of components within the TX-RX unit.
Descriptions of components specific to the VCO unit.
Details on capacitor and resistor types, values, and coding.
List of main unit parts and accessories like knobs, cases, and batteries.
Detailed list of component parts for TX-RX unit and VCO unit.
Pin functions connecting TX-RX unit (A/4) to control, VCO, and PTT.
Pin functions connecting control unit (B/4) to functions, keypad, and TSU-8.
List of essential test equipment for performing adjustments.
Steps for common TX/RX, PLL, and transmitter adjustments.
Steps for adjusting receiver BPF, sensitivity, squelch, and S-meter.
Identification of adjustment points and visual guides for VCO unit.
Component and foil side views for TX-RX unit C/4 and D/4 boards.
Component and foil side views for TX-RX unit A/4 board.
Component and foil side views for TX-RX unit B/4 board.
Component and foil views of TX-RX unit (B/4) with IC diagrams.
Electrical specs for BC-17 charger and views of battery packs.
