On Thu, Jun 7, 2012 at 11:13 AM, Gasper Zejn <z...@kiberpipa.org> wrote: > > a bit more on my setup: I'm using funcube as a source, tuned to 868.48M, LNA > gain 20dB, mixer gain 12dB, connected to simple squelch (threshold=-40dB, > alpha=1) and on to quadrature demodulation block. This block then outputs > clearly visible binary signal when funcube is initialized properly. > > The observed signal is rated at 20kbit, so it's a bit on the upper limit of > what Funcube can do, but it's still possible to get a decent read. It's a > burst of bits every 5s from a power meter[1][2], and the first part is a lead- > in and stays the same even if readings change. > > Somewhere in the funcube source block there is obviously something wrong with > initialization. Running qthid after starting flow changes something in funcube > that makes it output correct signal. Using this and the fact, that the lead-in > stays the same, it seems the "corrupt" signal (viewed in scope) is sometimes a > derivative of the expected signal - most of the time on zero, with spikes up > and down on transitions, with timing corresponding to transitions in expected > signal.
Do you have the same frequency correction value in both qthid and the FCD source? If yes, what is the value? Alex _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
