Re: [Discuss-gnuradio] Funcube dongle issues and a solution

[Gasper Zejn]

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 <address@hidden> 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