[Discuss-gnuradio] Re: Basic RX. - usrp_wfm_rcv.py

[Patrick Strasser]

Rita's pfc wrote am 2008-07-25 17:39:

> First of all, I've run the dial_tone.py example, and it was ok. Then, I
> wanted to use the USRP, so the next example I wanted to test was the
> usrp_wfm_rcv.py. I've connected a Basic Rx daughterboard to RXB. I write
> ./usrp_wfm_rcv.py -f 100, I get an error message: FYI: No powermate or
> Contour  Knob found;  http://www.nabble.com/file/p18654189/error_fm.jpg 

This is more an information message than error. The Powermate and the 
Contour knob, if present, are used for more convenient usage, but the 
program still runs without any of them. You can use the interface with 
the mouse without a drawback.

Regarding your problem: The option "-f 100" in your command instructs 
your program to listen FM at a frequency of 100Hz. The option takes 
magnitude suffixes, so you'd rather want "-f 100M". Choose a frequency 
of a strong radio station in your area.

You will not be able to listen so FM radio without a adequate antenna. 
For a dipole the receiving length of your antenna should be in the order 
of lambda/2, that is c/f/2 = 3*10^8/1*10^8/2=1.5m.

Patrick
--
Engineers motto: cheap, good, fast: choose any two
Patrick Strasser <patrick dot strasser at student dot tugraz dot at>
Student of Telematik, Techn. University Graz, Austria