12. Re: what is this creature/sound ?

["Dan Dugan" dandugan_1999]

> First off, thinking RADAR may be the cause of the noise should be ruled
> out...  Radar operates at such high frequencies typically above 1000 Mhz=

> that it will never have enough energy at the audible frequencies to be of=

> any effect.

Of course not, neither are cell phone transmissions anywhere near the audio=
 band. But when the high-frequency signals are non-linearly detected (recti=
fied, demodulated) in the audio equipment, audio frequencies result.

I recall a periodic "zip" in the sound system at the Old Globe Theatre in S=
an Diego that was likely the result of scanning by a military radar.

-Dan