[Spooks] Unid signal 4717

[Martin Potter]

Milspec390 at aol.com wrote:
 >
> SSB feedback, you 
> get variable pitch squeal and swooshing cycling by virtue of slight freq error 
> or propagation shift. 

I probably haven't thought this through completely, but if the feedback 
occurs between the open mike and a nearby loudspeaker, what role does 
propagation play??  (Other than audio propagation across the room.)

... Martin   VE3OAT