Introduction
This service manual provides comprehensive technical details for the Kenwood TM-733A/E, a 144/440MHz FM dual band transceiver designed for amateur radio communications. It includes detailed circuit descriptions, semiconductor data, component lists, exploded views, adjustment procedures, and PC board layouts.
The TM-733A/E offers advanced features such as simultaneous reception of both 144MHz and 430MHz bands, memory channels for storing operating states, and a large LCD display for clear visibility. Its design emphasizes user-friendly operation, similar to monoband transceivers, while providing full dual-band functionality.
Key Features
- Dual band operation (144MHz and 430MHz)
- Simultaneous reception capability
- Memory channels for storing settings
- Large LCD display
- Simple, intuitive operation
- Built-in duplexer (excluding specific types)
- S-meter squelch function
- DTSS and paging functions
- Packet communication connector
Technical Overview
The transceiver utilizes separate PLL and IF units for each band, enabling simultaneous reception. The circuit descriptions detail the frequency configurations, transmit and receive circuits for both 144MHz and 430MHz bands, squelch circuits, shift register operations, and audio signal systems. This manual is essential for technicians and advanced users involved in the maintenance and repair of the Kenwood TM-733A/E.
