Re: [ARSCLIST] Stereo records.

[Mark Durenberger <Mark4@xxxxxxxxxxxxxxx>]

We did that a lot in the late 50's.  We worked with a drive-in theater 
(remember them?) in St Cloud Minnesota.  Played 1/4-inch 1/4-track stereo 
tapes and then the newly-released LPs before the movie.  FM fed the movie 
speaker system and moviegoers tuned their car radios to the AM channel.

We did AM-AM stereo as well; that generally provided the best stereo 
tracking.  AM-FM worked okay since early on, phasing wasn't important (and 
would have been impossible given the highly different AM and FM 
characteristics).

No matter the mis-matched media, the "ping-pong" stereo sounded great; in or 
out of phase...

And then it was on to FM-Quad in 1970.  What fun!

Mark Durenberger


----- Original Message ----- 
From: "steven c" <stevenc@xxxxxxxxxxxxxx>
To: <ARSCLIST@xxxxxxxxxxxxxxxx>
Sent: Thursday, June 15, 2006 6:36 PM
Subject: Re: [ARSCLIST] Stereo records.


> ----- Original Message ----- 
> From: "Michael Shoshani" <mshoshani@xxxxxxxxxxxxx>
> > On Thursday 15 June 2006 14.14, steven c wrote:
> >
> > > At a guess, I'd say radio...in particular, FM radio, which was stereo
> from
> > > (when?).
> >
> > In theory, from the very beginning, although in practice from probably
> 1960,
> > give or take three years.  Armstrong gave an FM multiplexing 
> > demonstration
> in
> > 1933 or 34 that mixed a signal from NBC Red Network, one from NBC Blue
> > Network, a facsimile front page of The New York Times, and one other 
> > thing
> I
> > can't recall offhand - all on the same carrier wave.
> Well, I can recall an early "stereo experiment" that involved a sort-of-
> local station that had both AM and FM operations...and broadcast one
> channel on each for a half-hour program...
>
> Steven C. Barr