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James Peroulas james at peroulas.comOn Sun, Nov 18, 2012 at 3:05 AM, Dimitri Stolnikov <horiz0n at gmx.net> wrote: > I had to apply the attached patch for it to compile on my machine. > Thanks for the patch! cmake is something very new to me :) > Unfortunately i wasn't able to test the tools, as both of them segfaulted > in xc_peak_freq? Backtrace fragment attached. > Fixed (and pushed)! That was an easy bug to find and was related to the fact that LTE cells in your area were at such a high frequency (1.8GHz). The one's I've worked on were in the 700MHz band. > Also, i noticed that you calculate the expected tuning frequency for e4k > tuners in order to make your calculations more exact. Can you tell us which > tuning errors you get from the e4k driver usually and how this affects your > application? > Well, it's like this. Since the LO and sampling clock are derived from the same reference, if I can figure out the frequency error of the LO, I will know the frequency error of the ADC and I can use the frequency error of the ADC to predict where I should be sampling the data. That way, in LTE-Tracker, when the dongle's chrystal output stabilizes, the time offset of the tracked basestations should not change (as long as the dongle itself is not moving). I needed to calculate the actual LO and sampling frequencies used by the dongle in order to remove the small time offset drift I was observing. As a new feature request, it would be nice for the library to return the actual frequency that was programmed into the dongle in floating point (fractions of a Hz sometimes matter). So, if I request 739,000,000Hz, the library would be able to tell me that the actual programmed frequency was 739000025.5123... Hz. Similarly for the sampling rate. > http://www.evrytania.com/lte-**tools/lte-tracker<http://www.evrytania.com/lte-tools/lte-tracker> >> > > Nice documentation & videos! Linked the page on the rtl-sdr wiki. > Thanks for the comments and the link! James -- *Integrity is a binary state - either you have it or you don’t.* - John Doerr -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20121118/aea27897/attachment.htm>