Re: [IRCA] 1215 SAH

[nhp@xxxxxxxx]

Quoting Michael Hawkins <downsized99@xxxxxxxxx>:

> "What" was the question.  Perhaps there's a good reason I don't go south of
> the border (besides most of south of the border coming north).  If its
> sub-audible, I would assume that they're picking it up on a spectrum analyzer
> or some form of test equipment as compared to ears?
> 

It's hearable with the ears, Mike, and you hear them regularly, not just on
exotic DX, graveyard channels are notorious for them.  It's the whoosh whoosh
whoosh sound (how's that for a scientific elucidation?) that you hear when two
stations on a channel are not at exactly the same frequency.  If they're
separated by one Hertz, the repetition rate on the whooshing will be once a
second etc.   Of course, by 20 or so Hertz separation, you've got a growl which
is truly audible.

Pretty sure there is stuff in the IRCA reprints on this, "Yes, SAH" by Glenn
Hauser, springs to mind.

best wishes,

Nick




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