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Re: [IRCA] 1215 SAH
- Subject: Re: [IRCA] 1215 SAH
- From: Michael Hawkins <downsized99@xxxxxxxxx>
- Date: Tue, 18 Sep 2007 04:09:56 -0700 (PDT)
Nick,
I've definitely heard the growl but I never knew someone put a name to it. Thanks!
Mike
nhp@xxxxxxxx wrote: Quoting Michael Hawkins :
> "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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