Sorry I had been looking online for a list of all the arguments, then smacked my forehead after hitting rtl_fm --help.... not sure if the same -args apply via gnuradio but I'll see what I can do. I think something I did has helped as the AGC pumping effect isn't happening to me any more.

Thanks,
-Ron


On Thu, Nov 15, 2012 at 3:47 PM, Steve Markgraf <steve@steve-m.de> wrote:
Hi,

On 15.11.2012 21:11, Ron Senykoff wrote:
> I have gnuradio running with the R820D DVB. Latest GQRX has the nice rf
> gain inside which REALLY helps. Has this been merged over to gr-osmosdr
> ? I recompiled probably just a few days, both from source.

gqrx uses gr-osmosdr as source block, so it's identical.

> I'm trying to figure out how to set gain from within gnuradio (is there
> a argument I can pass the device in the source block?).

Yes, the 'Gain' argument.

> Also using the OSMOSDR block I still see an LO like spike right in the
> middle.

gqrx uses an internal DC offset correction algorithm, which you'd need
to implement in your flowgraph as well if you want to remove the
spike.

Regards,
Steve