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From: Grant.Downey@p0.f9.n381.z1.fidonet.org (Grant Downey)
Newsgroups: misc.handicap
Subject: Re:  S.C.A.
Message-ID: <14860@bunker.UUCP>
Date: 9 Oct 90 20:26:01 GMT
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[This is from the Blink Talk Conference]

Thanks for your message.  I just looked at it and am anwering you prety 
much off the top of my head.  As no doubt you know the SCA channel is 
created by the generation of stareo.  From what my engineer tells me, 
unless the system is hooked up correctly, there will be problems on 
both sides, the main channel, and the Radio Reading Service.  Before I 
came to this one the channels were always overriding each other.  In 
our case, I send our programming via phone line to the KTEP main 
Control room (our main transmitting facility) and from there they send 
it up via SCA at 185 megahurtz via mivrowave to the main transmitter 
where the signal is decoded back down to 67 magahurtz and transmitted 
to our SCA receivers at 67 megahurtz.  The reason for this procedure is 
that it keeps KTEP's signal out of the way of ours and vice versa.  The 
down side of this is that we loose a lot of audio quality.  I plan on 
buying the latist Moseley SCA generator out that claims to clean up 
some of the bad audio.  I have our Limiter-Compresser set so that the 
recovery rate is quite fast so that very little of the main channel 
ever ever gets in the way of my audeo.  The side effect of that is we 
get quite a breathing effect on the audio output but I'd rather have 
than than NPR's All Things Considered int he background.  One other 
factor that can cause bleed over is the fact that the higher the 
modulation of the main channel the more bleedover there is going to be. 
 Fortunately our main channel is primarely clasical and our engineer 
doesn't believe in much processing therefore our Radio Reading Service 
is prety cleen but a little muffled.  If you have any other questions 
don't hesitate to ask! Hope I've been some help. Grant

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