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Subject: Re: Downconvert TV VHF audio for monitoring incar...
Date: Wed, 16 Oct 2002 02:58:55 GMT
NNTP-Posting-Date: Wed, 16 Oct 2002 02:58:55 GMT
Organization: AT&T Worldnet
> I need to monitor TV station audio on 201.75MHz in the VHF band. The
> audio is mono and is vesidual carrier. Is there an easy way to
> down-convert and use the car's am/fm radio to listen in? Thanks, Pete
Years ago I made a Shortwave to AM radio downconverter. Basically,
it consisted of an oscillator (xtal) set to 1Mhz(?) above the signal
of interest and some kind of nonlinear amplifier (perhaps just a simple
transistor). The mixer -output- consisted of (amongst other things) the
Shortwave broadcast but modulated in the AM band.
This was a Radio Electronics (magazine) circuit.
This basic setup is all you need. Search the web for this type of thing
and your sure to find some simple circuits.
Brings back fond memories!
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