Thanks. I will work down that path and report back when I have something working. On Dec 7, 2016 5:07 PM, "Dimitri Stolnikov" horiz0n@gmx.net wrote:

Hi John,

you're on the right track - you give it one the values listed in <key>...</key>, True or False here. It might take integers 0 or 1 as well.

Best regards, Dimitri

On Wed, 07 Dec 2016 02:12:50 +0100, john john@tonebridge.com wrote:

Hello,

...

I am not sure how to set auto gain on a RTL dongle. I ran across this which I think should be what I need:

http://cgit.osmocom.org/gr-osmosdr/tree/grc/gen_osmosdr_blocks.py

From that page:

|<param> <name>Ch$(n): Gain Mode</name> <key>gain_mode$(n)</key> <value>False</value> <type>bool</type> <hide>#if $nchan() > $n then 'none' else 'all'#</hide> <option> <name>Manual</name> <key>False</key>

</option> <option> <name>Automatic</name> <key>True</key> </option> </param> |

However it is not clear what I need to pass to make auto gain happen.

Thanks,

John