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RE: For the engineers on the list...
> -----Original Message-----
> From: Matthew Osborne
> Sent: Monday, July 21, 2003 7:49 PM
> Subject: For the engineers on the list...
>
>
> I have a general question, specifically addressed to
> any engineers (or those with knowledge in this matter)
> on this list. I own a micro-power FM transmitter
> built from a kit that I have hooked up to my computer
> so I can listen to mp3s or streaming audio anywhere in
> my apartment. There is one problem though -- along
> with the audio that I transmit over it, whenever I
> have a stereo receiver set in the stereo mode, I get
> this high pitched tone underneath the audio. This
> tone goes away every time I switch a receiver into
> mono mode, so my suspicion is that the stereo pilot
> generator, in addition to generating the pilot tone,
> is also generating an audible tone that it should not
> be. Could this problem be caused by a
> weak/insufficient solder point on the circuit board,
> and does anyone know how I would go about tracing the
> circuitry to find exactly where the stereo pilot is
> generated? Any help or ideas anyone could provide
> would be most appreciated...
>
> Matt Osborne
> Poughkeepsie, NY
I have a Ramsey FM-25 that I use to rebroadcast my internet station to the
receivers in my house and yard. When I first assembled it, there was no
stereo and the problem was traced to a weak solder joint. A joint that is
loose or touches another pad could be the problem. But one other thing
strikes me: is it picking up noise from the computer? I've used an
isolation transformer on my stereo output to eliminate hash noises from the
computer.
-Larry
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