Thread on the LF/HF emergency frequencies as used from the 1930s and their use. These frequencies were popular even during the Cold War. The workhorse AN/ARC-5's crystal-controlled transmitter usually held the 3105 kHz preset.
https://www.usni.org/magazines/naval-history-magazine/1993/december/amelia-didnt-know-radio
https://www.usni.org/magazines/naval-history-magazine/1993/december/amelia-didnt-know-radio
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