On Mon, Oct 1, 2012 at 1:27 PM, Fabián Kozynski <
address@hidden> wrote:
> As sanity check I'm trying a simple flowgraph in GRC with a QAM mod/demod:
>
> Vector Source ==> Throttle ==> QAM Mod ==> QAM Demod ==> Unpacked to Packed
> ==> File Sink
>
> The parameters in the mod/demod are as default. I also have a File Sink
> before the mod.
>
> In the output I see first a bunch of zeros, then a bunch of random numbers
> and after 20 or so bytes I get a sequence with the same period as the
> original one, but different numbers. I suppose this is a problem of phase
> sync.
>
> What's the right way to simulate a simple mod/demod? How do I add sync
> between mod and demod?
>
> Thanks,
> Fabián