This manual covers the essential information for Kenwood FM transceivers, including safety precautions, specifications, accessories, installation steps, and operating procedures. It addresses each model (TM‑231A, TM‑231E, TM‑331A, TM‑431A, TM‑431E, TM‑531A, TM‑531E) and provides detailed wiring, antenna, and power‑supply guidance.
Additional sections describe maintenance, optional accessories such as microphones, speakers, and remote controllers, and include diagrams and schematics to aid troubleshooting and proper mounting in vehicles or fixed stations.
| Frequency range | 144‑148 MHz (TM‑231), 144‑146 MHz (TM‑231E), 220‑225 MHz (TM‑331A), 438‑450 MHz (TM‑431A), 430‑440 MHz (TM‑431E), 1240‑1300 MHz (TM‑531) |
|---|---|
| Power requirement | 13.8 VDC ±15 % (11.7‑15.8 VDC) |
| Antenna impedance (spec table) | 500 Ω |
| Antenna impedance (installation) | 50 Ω |
| Operating temperature | ~ 20 °C to +60 °C |
| Maximum output power | 10 W |
The transceiver requires a 13.8 VDC power supply.
Use an antenna with a 50 Ω input impedance.
Four SEMS screws are used to secure the transceiver to the mounting bracket.
A 50 Ω coaxial cable such as RG‑8U or 8D‑2V is recommended.