SCA

[flwfg]

With so many stations going to HD... is SCA (sub carrier audio) even used for anything locally ??? I know there are 2 SCA frequencies available, and that WUSF USED to use one for it's reading for the blind services... but is ANY station in the metro area using SCA at all now ??? If so, WHO ???

 

[cd637299]

No answer for you, sorry; but this is a chance to ask:

Are there any online SCA directories? I cannot find one.

cd

 

[flwfg]

There USED to be, and of course, Dr. Bruce Elfing, who also published FMEDIA & FM Atlas used to have updates until he passed away a couple of years ago.. Checked with his daughter and she has no new info....She did say that it was felt that it could still be used, even with HD...If anyone finds one online, I would be greatly appreciative...

 

[radioboy]

KVGC appears to now be on AM 1340, but for a number of years they were an SCA only station.
They went by the moniker of Hometown Radio.

Here's a link to their website now in which owner Jim Guidi mentions their SCA station era:

http://www.kvgcradio.com/about-hometown-radio

 

[cd637299]

There USED to be, and of course, Dr. Bruce Elfing, who also published FMEDIA & FM Atlas used to have updates until he passed away a couple of years ago.. Checked with his daughter and she has no new info....She did say that it was felt that it could still be used, even with HD...If anyone finds one online, I would be greatly appreciative...

Yes I knew him, and used to have his books.

Per DavidEduardo's link, here it is:

http://www.americanradiohistory.com/Archive-FM-Atlas/FM-Atlas-21-2010.pdf

But, is it still good for 2013 as far as SCA? As I recall, the SCA references are only in the by-state section. I'd think that SCA's would change just like HD 2's & 3's shuffle.

cd

 

[Ai4i]

SCA's have lousy frequency responses, can be unusually hissy, and the 67's are subject to main channel splatter. Also, some poorly designed receivers mix the SCA with the stereo pilot and internally generated harmonics and heterodynes to produce objectionable tones in the main channel audio. I have owned several SCA radios. It was a poor technology from the get go.

 

[rfrus]

SCA is used on 94.9, 100.7 and 102.5 as LP2 stations for Tampa EAS and works very well. The SCA is received as far away as Sebring without difficulty. New solid state transmitters, such as on 94.9, have considerably reduced cross talk and improved SCA performance signifigantly. New SCA receivers made by Dayton Industrial in Sarasota have also helped SCA to be a viable EAS channel here in Tampa.

The SCA works very well for EAS as you dont have to get premission from Programming to air an alert. Broadcat and Cable systems receive the alerts via the SCA signal and relay the alerts on to their listeners and viewers.

 

[Groove1670]

We had SCA at WFYN (WEOW) in the Keys in the late 80's. Nothing like a pager going off with B EZ music along with your message. ;D

 

[Ai4i]

The reason the entire world uses our multiplex FM stereo system dates back to the 1950's when several standards were competing for FCC standardization in this country. Many systems offered better quieting including stereo range EQUAL TO mono range and less picket fencing from multipath issues. The only thing this convoluted technology with the 19 KHz pilot tone and sidebands from 23 to 53 KHz starting as DSB supressed carrier and eventualy turning into FM had going for it was the ability to add these extra channels which at the time was considered to be totally private.
Originally, stereo stations could have an SCA @ 67 KHz and mono stations could have one or two more somewhere down in the stereo sideband region. RBDS and the 92 KHz channel were added many years later.

Yes I knew him, and used to have his books.
cd

Don't know how long they have been around, but I used his yearbooks extensively back in the 1970's