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Michel Pelletier pelletier.michel at gmail.comOn Sun, Oct 21, 2012 at 7:00 PM, Jay Salsburg <jsalsburg at bellsouth.net> wrote: > Hello Michel > > OK, I see you are way ahead of me. However, I have some experience using > these TV Dongles, they have pitfalls. Number one is its frequency Accuracy, > out-of-the-box; needs calibration. Another is that its frequency accuracy > drifts over time and from the Ambient temperature necessitating periodic > offset calibration. While it is possible to create a compensation cure for > frequency drift vs. temperature, it may be far more prudent to place the > Dongle in a temperature controlled enclosure (50C Heater) keeping it above > the ambient to help prevent drift, in your case, the all too important > Temperature related Phase Shift. I have thought of disconnecting the > Dongle's Crystal and placing it in a Crystal Oven, but I have not tried > that. The Entire Dongle is small enough to place it in a temperature > controlled enclosure which also keeps it dry. Interesting! I was actually considering going the other way, and putting the radio in a Peltier cooled enclosure, but that was based only on my experience with cooling digital cameras for astrophotography purposes to lower noise. I just instinctively figured that lower temperatures would equate to lower noise in a radio receiver as well, but I have no experience with the kind of accuracy drift or phase shift you're talking about. Well, this is definitely something I will keep in mind when I try to capture my first baseline. :) -Michel