HFU HF Underground
Loggings => Utility => Topic started by: Corvus on May 26, 2017, 0248 UTC
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San Francisco ATC with aircraft position reports and flight clearances. Handing out secondary frequency 5574. ATC(?) generating a dual tone during some transmissions.
Edit: Just heard aircraft request "SELCO" check. Tones are call alerts so the crew doesn't have to listen to HF. Learn something new everyday.