[hpsdr] PSK31

[Graham / KE9H]

I suggest that you short out resistor R37 on Mercury.  It slows down the
edge rate too much when Mercury is used as the clock source.  When
shorted out, the 10 MHz clock when originated from Mercury will look
the same as a 10 MHz clock sourced from Penelope.
Euro-Mercury does not have this resistor, so not an issue for Euro-Mercury.

--- Graham

n3ick at cox.net wrote:
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> When running this mode I see a frequency shift betweeen the receive and transmit frequencies when using the Mercury clocks it does not appear when I use the Penelope clocks. It does seem to get better the longer they run which would suggest the xtal frequencies may drift a little. I have run the cal with WWV and test equipment, I also have the latest and greatest software and firmware from the repositories using svn update.  This difference is small 20-40 hz but when using close in filters you sometimes don't know when someone is answering your CQ. The filters are great and no agc pumping it's wunderbar. 
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