Just recently on my last fo-29 pass.. I attempted to have SatPC32 do my doppler correction for me. This is what I noticed.. and I am looking for any Ideas. When I found my downlink freq using the VFO mode the doppler would jump every 5-6 seconds.. not a smoothe tune. and eventually I lost my downlink freq altogether. How often does the program tell the radio to move the frequency? I have it set to the recomended 90 setting.. Im just wondering is this normal.. or should it smoothly tune a ssb signal at all?
-Steve Raas N2JDQ FN20vg
Steve,
A couple of areas to look at. First, take a look at the CAT menu, and see what your update frequency interval is. I use 20 Hz for SSB. That gives a smooth tracking, and once netted, SATPC32 will track through a full pass. It WILL update every few seconds, but the jump should be small enough that it is just barely audible. You can get by with a much larger step size, but of course the jump will be more noticeable, but still usable.
Are you using a USB serial port, or a "real" port? There is nothing wrong with a USB serial port per se, but some of them are rather flakey. I had one which required about 5 times the recommended CAT delay to work at all, and would usually eventually cause the radio to lose tracking exactly as you describe. The was not a problem with SATPC32!! Nothing else worked reliably with that port either, so I finally gave up on it and went back to a real serial port, since I had one to spare.
Alan WA4SCA
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