The big 80s station

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Krakatoa
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The big 80s station

Post by Krakatoa » Tue Jul 09, 2019 7:03 pm

Today I have tuned in 107.9 FM this station in a location 30km outside Barcelona. On the RDS shows exactly "The big 80s station 107.9", but the only reference I have found about this is the "supposedly only" online stream that comes up easily after a google search.
Also, the music on the radio matched exactly what was playing on the stream, if only the stream was a little delayed.
Reception on my location is very faint and scratchy, although the rds comes in nicely.

I don't know if the FM is theirs already or somebody else unrelated to the stream owners is just relaying it to the airwaves.

Any info on this?

Thanks!

Elopid
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Re: The big 80s station

Post by Elopid » Wed Jul 10, 2019 7:42 am

I've never had RDS ever coming up with a "faint and scratchy" signal before...

Krakatoa
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Re: The big 80s station

Post by Krakatoa » Wed Jul 10, 2019 9:06 am

Yes, rds does reach out successfully in cases where the subcarrier is turned up to a higher than usual level at the transmitter side.

Elopid
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Re: The big 80s station

Post by Elopid » Thu Jul 11, 2019 5:24 pm

I've tried that and it just makes a loud high pitched noise over the audio

Albert H
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Re: The big 80s station

Post by Albert H » Fri Jul 12, 2019 11:43 am

Elopid wrote:
Thu Jul 11, 2019 5:24 pm
I've tried that and it just makes a loud high pitched noise over the audio
It depends how good the output filter on the RDS circuit is. - it should be a very tight filter tuned to 57kHz, but many of the cheap RDS boards have little or no filtering. My RDS board uses a two-stage active filter, based on gyrators (using two TL074 op-amp ICs) and gives steep filtering either side of the nominal 57 kHz. If I deliberately over modulate the RDS, it doesn't become audible in the audio passband until it's comparable in level to the stereo pilot, and even then it's just a quiet background burble!
"Why is my rig humming?"
"Because it doesn't know the words!"
;)

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