Re: [Discuss-gnuradio] RDS

[Jan Schiefer]

Hi Erlend,

I think you should be able to see the subcarrier with the USRP. The 
injection level of the RDS signal is typically around 1.5 to 2%, this is 
substantially less than the pilot, which is typically around 9%, but it 
should still be visible. Make sure you have a good signal without too 
much multipath. Also, you want to double-check whether the station you 
are looking at is indeed carrying RDS (not sure whether everybody does 
in Norway).

If you end up writing a decoder, please drop me a line. The American 
version of RDS, called RBDS, is (of course) slightly different. I'd be 
interested in helping to making sure that it will work on both sides of 
the Atlantic.

Cheers,
   Jan


Erlend Barstad Strand wrote:
> Hi
>
> I am trying to extend the usrp_wfm_rcv_pll.py by reading the RDS
> subcarrier, however I have a problem observing the subcarrier at all. I
> have connected a file_sink to the fm_demod in order to see the spectrum
> in Matlab. In the spectrum I can observe the L+R, L-R and pilot tone,
> but no RDS subcarrier at 57kHz.
>
> Have anyone successfully seen this channel on broadcast FM?
>
> Is it possible that the RDS subcarrier doesnt have enough power to be
> oberved with the USRP board?
>
> best regards
> erlend
>
>
>
>
>
>
>
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