Re: [Discuss-gnuradio] Really low sample rates for gr_sig_source_x()

[Eric Blossom]

On Sat, May 08, 2010 at 06:13:15PM -0400, Marcus D. Leech wrote:
> It looks like when you set low sample rates (say below 1KHz), the NCO
> code doesn't seem to work right,
>   *never* putting out samples.
> 
> I haven't done exhaustive testing.
> 
> This was prompted by Bill Pretty's issue with his flow-graph that uses a
> triangle or sawtooth generator,
>   at low sample rates (2Hz) and low Fc (a fraction of a Hz) to drive the
> tuning variable going back into
>   the USRP.
> 
> I tested the graph he gave, and after making a few fixes, observed that
> the signal source appeared to be
>   never producing any output.  Hmmmm.
> 
> So, I did up my own flow-graph, consisting of a signal source, a
> throttle, and a number sink and scope.
>   It only started to work when I cranked the sample rate up to about
> 1KHz on the signal source.
> 
> Any ideas?

Does it work without the throttle?

Eric