Re: [Discuss-gnuradio] Building a spectrum analyzer

[Eric Blossom]

On Thu, Jul 16, 2009 at 04:08:40PM +0200, Yc Park wrote:
> Hi all,
> 
> Recently I started to build a spectrum analyzer with some extra
> functions such as channel power measurements and spectrum mask
> check.(so, fft_sink is not a good solution for this.)
> 
> To do so, my plan is this:
> 1. get fft data vector of given size(2048) from usrp2 (data refresh rate
> ~= 5 bins/sec)
> 2. process the data vector with scipy functions
> 3. display it with matplotlib module
> 
> But at this time I'm stuck at step2: how can get fft vector so that I
> can proccess it with scipy module?
> Connect() seems to connect blocks, not give out the data vector.
>
> Or the vector_sink.data is not a good choice since I do not have control
> over the data size.

Try a gr.message_sink like is done in fftsink_*.py

Eric