Grundig G3 receiving New York Radio AERO

poikaa3 — — The G3, Receiving New York Radio AERO, This is one of many stations that coordinate flight paths of commercial and military aircraft. Once in a while Air Force One can be heard! The tones you hear are what is called SEL CAL or selective calling, where a certain tone combination will auto alert a particular radio to “wake up“ (come off squelch), pilots are busy enough in the cockpit,...