HF radios require an antenna tuner (often an internal or external coupler). When you switch frequencies, the radio will "click" and whine as the coupler matches the antenna to the frequency. Wait for the "Tune" light to stop flashing before transmitting.
Integrated analog and digital ciphered voice, high-grade encryption, and ECCM (Electronic Counter-Countermeasures) to resist signal jamming. thales trc 3700 manual
Given the radio’s military heritage, the manual is often export-controlled or restricted. Here are the most reliable sources: HF radios require an antenna tuner (often an
: Ensures connectivity in demanding environments by adapting to signal conditions. thales trc 3700 manual
The TRC 3700 features advanced security capabilities to protect communication: