[PCR-1000] IF output

[pcr-1000@mailman.qth.net]

have pasted the test from the site since the URL was stripped out

Wideband Discriminator Output
This may be old news for some people, but what the heck. I was flipping 
through the PCR-1000 service manual, and noticed that the wideband FM discriminator 
output is available on the DSP connector. I haven't modified mine yet (other 
priority projects in the queue!), but I think I'm going to add a 3.5mm stereo 
jack somewhere in the housing, and put the NBFM discriminator output on one 
channel and the WFM discriminator output on the other. Since mine is connected 
to a soundcard, this would allow selecting whichever discriminator you like as 
input into programs such as ACARS, satellite demodulators, etc. My main reason 
for all this is to hook up my SCA decoder. The signal is available on pin 11 
of J12, which is one of the connectors where the optional DSP unit connects 
to. This is straight off the detector chip (TA31136), so you might want to 
consider running it through an op-amp circuit with some settable gain, and make 
sure the input impedance is something the chip will be happy with. I haven't 
looked up the part yet, but when I get around to this, I'll post a schematic on my 
website. -- Chris, jcwren@jcwren.comon the PCR Mailing List. Thanks Chris!


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