[SBE] Demodulator question

[Dan Slentz]

P.S.  Generally you'll get out of these what goes in.  Levels with vary with program content, but unless the level gets crazy, the picture will be fine.  FM Systems (as mentioned) makes AGC's, but I've used their audio and video gear without much success.  To me they mess around with the dynamics of the content, plus they (just my opinion) tend to add noise.
Dan

--- On Wed, 12/31/08, Bill Whitt <billw at betterlifetv.tv> wrote:

From: Bill Whitt <billw at betterlifetv.tv>
Subject: [SBE] Demodulator question
To: "'sbe member discussion mail list'" <sbe at sbe.org>
Date: Wednesday, December 31, 2008, 8:06 PM








Hello all,
            I was wondering if anyone is using the Blonder Tongue AD-1B 5932 Agile A/V Demodulator. I have a question on the output of this device. I have been using the Cadco 475 series and they have a audio and video adjustment on the unit to boost the output if needed. The Cadco’s have a duration of about a year and I’m replacing them more often than I would like. I was looking to go with the Blonder Tongue, but I’m not sure what the spec for the RF input is. Can it constantly provide a 1Vpp video … or is it dependant on the strength of the RF input. I am looking for a device that can take a varied RF input and provide a consistent video output. I can envision a dark picture during a low RF or a over modulated signal when the RF is higher. If the Blonder Tongue can compensate for this I would love to try it. The other draw back to the Cadco that I don’t like … is the fact that it is a manual gain adjustment. If I do vary the RF
 input to the Cadco … it doesn’t compensate too much for that, and I run into under and over modulation issues. I would appreciate any advice on the Blonder Tongue, or a device not stated here.
 
Thanks,
 
Bill_______________________________________________
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