[Discuss-gnuradio] accumulate spectrum

Dear All,

I'm new to Gnu Radio. I looked carefully to the doc and tutorials but could not find any simple answer to my problem.

I have a radio signal from which I'm able to visualize the FFT in GNU Radio Companion.

Now I would like to save the FFT (more exactly the magnitude squared, or the spectrum) accumulated over a given period of time (the average over time) into a file.

I found the following blocks in GRC that seem to be helpful:

- stream to vector

- FFT

- complex to mag

- file sink

However I did not manage to save any accumulated spectrum...

Any help (eg a woking example) would be very welcome!

Thanks in advance.

Adellain