The "ADF" function of AN/ARC164 system whose controller is in the photo earlier in the thread enabled ADF of 121.5 and 243. Those frequencies are harmonics as a matter of design choice, not coincidence.
Making cat noises on the distress frequency? Just goes to show that even the brainless can use a radio. I'd be letting Centre know when those transmissions are received, the signal strength and my current location. Patterns will eventually emerge...