The German made U-600M transceiver was used for single-side band (SSB) radio transmission
While the unit looked fairly unremarkable on the outside, the inside was a different story, with several interesting components and modules
These included a metal cylinder, likely a mechanical filter, and several trimmer capacitors and dogbone capacitors
The transceiver’s modules were its most interesting feature, allowing for the configuration of the unit to different frequencies, a predeminance of older radios that is less common today as broadband digital synthesis techniques are more common.
The video, and the radio, are a fascinating look at older tech that performs well, nonetheless. specific SDR chips that can simplify the build process further.