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Re: [Discuss-gnuradio] RDS

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] RDS
Date: Thu, 05 Oct 2006 12:13:54 -0700
User-agent: Thunderbird (X11/20060922)

I seem to recall someone writing a gr-rds module a while ago.  You might
check the mailing list archives.  I would love to have this feature in
gnuradio.  Please let me know if you need any help.


Jan Schiefer wrote:
> 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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