Re: [Discuss-gnuradio] FM Receiver doesn't work

[Martin Braun]

On 02/19/2014 07:46 AM, stephan vanwoezik wrote:
> Hello,
> My system: WBX motherboard, B100, 2007 Macbook Pro 10.8.5 2.4 ghz core
> duo 4gb 1067mhz ddr3. 
> 
> I am new here. I have tried to build several FM receiver flow graphs -
> Taken from the Ettus website, Ettus Youtube page and other sources too.
> I get the same problem every time... no signal past the wbfm receiver. I
> am convinced it must be something with the wbfm receiver block. Ettus
> tech support  guys had me investigate sample rates and WX vs QT
> components, so I reduced sample rates as much as possible and ran both
> WX and QT configurations with no change.

Can you see an FM spectrum (using a QT GUI Frequency sink behind the
USRP source block)?

> I've gotten simple flow graph examples to output audio and every block
> that I've tried seems to do something except wbfm receiver. The Ettus
> guys were able to run my flowgraph (with audio output from wbfm
> receiver) when I emailed it. I just updated everything on macports and
> the issue still persists. What can I be doing wrong? I won't attach a
> file until someone asks me to, since I'm not familiar with etiquette.

Thanks for being polite about this! In general, you can attach small
files. For GRC, screenshots are sometimes useful, and should be posted
to an image hosting service, such as imgur. Long text output goes onto
pastebin.

Martin