Path: utzoo!attcan!uunet!samsung!olivea!oliveb!bunker!hcap!hnews!129!89!David.Andrews
From: David.Andrews@f89.n129.z1.fidonet.org (David Andrews)
Newsgroups: misc.handicap
Subject: Re:  S.C.A.
Message-ID: <14913@bunker.UUCP>
Date: 10 Oct 90 12:53:44 GMT
Sender: wtm@bunker.UUCP
Reply-To: David.Andrews@f89.n129.z1.fidonet.org
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Organization: FidoNet node 1:129/89 - BlinkLink, Pittsburgh PA
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Approved: wtm@bunker.UUCP

Index Number: 11058

[This is from the Blink Talk Conference]

 DK> hi grant.  i was interested to hear that you run a reading  
 DK> service and had a couple of questions for you. 
 DK> first, why does it seem that the audio on so many of these  
 DK> services is too low, i.e., BSB & Audiovision.  Also, it seems  
 DK> that these services can never quite get rid of the bleed over  
 DK> from the master fm station (sca main channel)

While Grant will probably answer this, I will jump in here too.  I
have run three different radion reading services and was involved
in the field for ten years.  Both properties you describe, low
volume and crosstalk are the nature of the beast.  They are
somewhat inherent in the sub-carrier signals that these stations
use.  You can minimize crosstalk tomewhat by adjusting your
antenna.  It will also vary somewhat from day to day, depending on
the weather and how well the transmitter is adjusted.  Both
situations can be minimized by the main carrier by boosting the
level at which the sub-carrier is injected into the main carrier
signal.  Many broadcasters run it on the low side because they are
afraid the sub-carrier will leak into the main carrier, however,
this fear is mostly groundless.  You could contact your reading
service and/or their main carrier station and beat on them to
increase the injection level of the sub- carrier.  If memory serves
me correctly, don't you live in the Sacramento area.  I know they
were using a TV SAP carrier out there.  I spent a lot of time with
them back in 1984 or 1985 before they went on.  I developed the
first SAP audio service in New Jersey, before them.  THE TV SAP has
a very good signal, generally better then a FM sub-carrier, so if
it is bad sounding, it is do to very conservative or bad
engineering.  David Andrews

... Your Sound Alternative

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