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PICList Thread
'RDS Decoder'
1997\04\29@064950 by Chris Smolinski

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Has anyone built a RDS decoder (for FM radio) using a PIC to decode the
data?

Chris

1997\04\29@071444 by David BALDWIN

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Chris Smolinski wrote:
>
> Has anyone built a RDS decoder (for FM radio) using a PIC to decode the
> data?
>
> Chris

--

       Yes, Elektor did one with a PIC 16C54. I can email the scan of the
article if you want.

Regards

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1997\04\30@021156 by nigelg

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In message  <.....3365D7CA.1CFBAE39KILLspamspam@spam@etca.alcatel.be> PICLISTspamKILLspamMITVMA.MIT.EDU writes:
> Chris Smolinski wrote:
> >
> > Has anyone built a RDS decoder (for FM radio) using a PIC to decode the
> > data?
> >
> > Chris
>
> --
>
>         Yes, Elektor did one with a PIC 16C54. I can email the scan of the
> article if you want.

There was an RDS decoder project in Circuit Cellar May 1995 written by
Chris Morris, it uses a 16C84 and either an SAA6579 or TDA7330, plus an
LCD display of course. Unlike the Elektor designs, the source code can be
downloaded from their web site (but I don't remember the URL off hand).

If you can't find it, I'll find the source code and E-Mail it you, it's
lurking on my drive somewhere :-).

Nigel.

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1997\04\30@073916 by Martin McCormick

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       It would be interesting to see the theory of operation for the
decoder, also.

Martin McCormick

1997\04\30@092400 by Andy Kunz

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At 06:32 AM 4/30/97 -0500, you wrote:
>        It would be interesting to see the theory of operation for the
>decoder, also.

I missed the start of this thread, apparently.

What is an "RDS Decoder" in the first place?

Thanks.

Andy

======================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865 USA
             Electronics for Industry & R/C Hobbyists
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======================================================================

1997\04\30@102141 by Philippe

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At 09:17 30/04/1997 -0400, you wrote:
>I missed the start of this thread, apparently.
>
>What is an "RDS Decoder" in the first place?

RDS:  Radio Digital System

Digital data which are sent at the same time with audio
signal. It usually contains radio name and other usefull
information such the other frequency where you can find
the same station.

Regards,
       Philippe.

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1997\04\30@104140 by Martin McCormick

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Andy Kunz writes:
>What is an "RDS Decoder" in the first place?

       RDS stands for Radio Data Service and uses one of the SCA frequencies
to send a stream of digital data which do such things as send the station's
call letters and a description of format as well as other short messages
like advertising or song titles.  The plans are also to send selective calling
codes so that commuters on the North side of town, for example, will only
hear traffic reports which deal with the North side, etc.  It is supposed
to be possible for RDS-equipped radios to scan the dial in a strange town
and find a station with a particular kind of music that you like even though
you've never been in this town before.

       I just thought it would be interesting to know the SCA frequency
used and the data format.  The frequency is probably either 67 or 92 KHZ,
but the data could be anything as long as it didn't cause too many sidebands.

       RDS is not a subscription service like most SCA operations so we
aren't doing anything a little shady, here.

       For those not familiar with United States government speak,
SCA stands for Subsidiary Carrier Authorization.

Martin McCormick

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