Dne Thursday 07 June 2012 ob 21:59:24 je Alexandru Csete napisal(a): > 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
Ahh, yes. I had 0 in my flow and qthid was -120. So sorry to waste your precious time. Gasper _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
