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Old 11th May 2011, 11:07 am   #42
G8HQP Dave
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Join Date: Sep 2008
Location: Solihull, West Midlands, UK.
Posts: 4,872
Default Re: A Stereo decoder for Leak Troughline 3

You will get noise between stations, as this is a feature of FM - the tuner does not have any squelch to silence this. The easiest way to test the decoder is to feed it a stereo signal and check that it decodes it! Tune to a known stereo station (if necessary, via the tuner output rather than the decoder). Adjust the decoder preset until the stereo LED lights. You should then be getting L and R outputs. You may need to check that the input to the decoder is not too small or too large. Too small will mean that it stays in mono mode, but it should otherwise be OK. Too large will cause distortion. Check the DC current draw of the decoder against the data sheet, bearing in mind that the LED may be a significant fraction of this.
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