On the Schaffer system some were sub audible and some were in the
high (read out of band) tones. Most were sub audible though.
Jim/W5JO
----- Original Message -----
From: "Bob Peters"
Hay Jim those are known as SUB Audible tones...When I worked for
MUZAK every
city had six SCULLY decks and a controller to run the music,,, It
would
switch from deck to deck so that the same music would never be
played in the
same sequence. All with sub audible tones. Was my job to change
tapes one
day a week and clean and replace heads when needed until Sat came
in around
1981.
Now even the SCA has gone away. I have one dealer that still uses
SCA in Mo.
Bob W1PE
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