Fair copy here @ 2055, sounds like adjusting radio equipment, mention of '20 to 21 watts'.
Maybe old military comms. Tactical calligns being used (such as 'variable'). Mentioned listening for hum.
2104 - mention of dynamos in the radio.
2105 - off
2110 - back on in USB with vintage naval military comms (or possibly audio from an old movie).
2115 - off