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 Post subject: Panasonic RE-6518 with SCA?
PostPosted: Jul Thu 29, 2021 11:17 pm 
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Joined: Mar Wed 10, 2021 11:51 pm
Posts: 2
Location: Pendleton, Oregon
I found this 1978 RE-6518 Panasonic for a couple bucks at a flea market and it has an "SCA" adapter installed by FM Atlas in 55701 (MN), any idea what an SCA adapter might be?

Still needs some cleaning and new grill cloth, I repaired a couple minor issues on this unit and it plays great...but I have no idea what SCA might be. I did some Googling and came up with nothing.

Any ideas?

Thanks in advance!

-Marty


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 Post subject: Re: Panasonic RE-6518 with SCA?
PostPosted: Jul Thu 29, 2021 11:37 pm 
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Joined: Aug Wed 26, 2009 1:50 am
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Location: Monroe GA 30656 (from Coventry, UK)
Here is some info:

https://www.rfcafe.com/references/popul ... e-1970.htm


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 Post subject: Re: Panasonic RE-6518 with SCA?
PostPosted: Jul Thu 29, 2021 11:45 pm 
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Location: Mountains of Mourne. Ireland.
Subsidiary Communications Authorization.
https://worldradiohistory.com/Archive-R ... 987-08.pdf


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 Post subject: Re: Panasonic RE-6518 with SCA?
PostPosted: Jul Fri 30, 2021 12:13 am 
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Joined: Nov Sun 29, 2020 5:59 pm
Posts: 280
Location: Northeast Illinois 60188
Does anyone know if SCA subcarriers on FM broadcast stations are still in use here in the USA or elsewhere, and if so, what stations are using them and for what program material (or data)?

From what I am reading, with some limitations, the SCA system is compatible with current HD radio broadcasting.


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 Post subject: Re: Panasonic RE-6518 with SCA?
PostPosted: Jul Fri 30, 2021 5:14 am 
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Joined: Jan Thu 09, 2020 6:46 am
Posts: 194
Location: Lexington, KY, USA
I haven't thought about SCA for a long time.

Who knows how old this page is:

http://www.n2nov.net/NYCareaFM_SCA.html

I have a feeling there isn't much outside of very large cities. Where I live, the "reading for the blind" services have gone Internet/Podcast AFAIK.


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 Post subject: Re: Panasonic RE-6518 with SCA?
PostPosted: Jul Fri 30, 2021 1:18 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 18803
Location: Utica, NY 13502 (USA)
WCNY-FM, Syracuse and its stations in Utica and Watertown have HD and still use SCA for its reading service according to its website.

https://www.wcny.org/radio/readout/#:~: ... %20request.

http://www.wcny.org/wp-content/uploads/ ... v_2017.pdf

Dave


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 Post subject: Re: Panasonic RE-6518 with SCA?
PostPosted: Jul Sat 31, 2021 8:45 pm 
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Joined: Jun Sun 15, 2014 5:37 pm
Posts: 1392
Location: Montreal, Quebec
SCA was originally primarily "elevator music". Bland instrumental music, I think recorded for the purpose, for elevators and waiting rooms. Since it required an addition to an existing FM radio, it was "secret" and so companies would subscribe to the service.

There were SCA adapters in the hobby magazines in the tube era. But it's a small segment of the population.

It became a "bigger" thing with ICs, but onoy relatively speaking.

I suspect "elevator music" comes from other sources now. In more recent times, SCA was used for extra programming, usually not English. No need for a who!e transmitter for Tibetan or Lakota programs, rent an SCA channel from an existing FM transmitter, then sell radios with SCA adapters to the listeners. That's probably in the past now, with the internet a viable means of distribution.


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 Post subject: Re: Panasonic RE-6518 with SCA?
PostPosted: Jul Sat 31, 2021 10:06 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: SoCal, 91387
"Back in the day", LOL, we would use the NE561 chip to decode audio (and video) on an OTA pay-TV station. The audio was transmitted on a subcarrier, SCA fashion.

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 Post subject: Re: Panasonic RE-6518 with SCA?
PostPosted: Jul Sat 31, 2021 10:21 pm 
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Location: Panama City, FL 32401
Also known as "Muzak" (elevator music). Reminds of the movie "The Blues Brothers " where the scene keeps going from the quiet elevator to the outside with the police banging on the doors trying to get into the building.


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 Post subject: Re: Panasonic RE-6518 with SCA?
PostPosted: Aug Sun 01, 2021 1:49 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 18803
Location: Utica, NY 13502 (USA)
There are 3 FM subcarriers which have become standard:

57 kHz - for the Radio Data System (RDS) that shows call letters, song titles, and other information on LCD displays on radios so equipped.

67 kHz - often used for (but not limited to) special audio services like alternate language programming and reading services.

92 kHz - often used for (but not limited to) a return link containing transmitter operating parameter data for observation at a remote control point.

Long ago, the AM station I worked for used a subcarrier on their commonly owned FM station to feed audio to other AM stations for a local sports network that they created. I built homebrew SCA decoders that were used for this.

Dave


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 Post subject: Re: Panasonic RE-6518 with SCA?
PostPosted: Aug Tue 17, 2021 4:16 am 
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Joined: Dec Thu 06, 2007 11:54 pm
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Location: Hayward, California USA
fifties wrote:
"Back in the day", LOL, we would use the NE561 chip to decode audio (and video) on an OTA pay-TV station. The audio was transmitted on a subcarrier, SCA fashion.

I remember the version with an LM565 chip, a transistor, and maybe 5 resistors and 4-5 capacitors. It could tune the SCA channels just fine (or OnTV audio, haha!). OnTV video could be seen by adding a J.W. Miller 6333 coil inline with the video. Fun stuff!

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