Maybe a bit off topic, but, in addition to the 25hz left channel tone
don't forget that you could also use 25hz on the right channel, and 35
hz tones on each channel. Add up all the different combinations and you
really have a lot of horsepower! This was really a slick way to get far
more control capabilities than just a single tone on a single channel.
This scheme was carried over to the early days of satellite delivery and
proved very successful there. (That sort of thing is done with serial
string commands now.) Cart machines had primary, secondary, AND
tertiary tones on a third playback head so they were never heard on
playback unless they were recorded TOO HOT then you'd hear crosstalk.
Those were the days...of denatured alcohol, cotton balls and swabs,
broken brake bands, worn out and misaligned tape heads...
73 de W5SAW, Steve
w4wsz wrote:
Oh Yes....those wonderful 25 cycle tones on the left chan......
----- Original Message ----- From: "Bob Peters" <[EMAIL PROTECTED]>
To: "'Discussion of AM Radio in the Amateur Service'"
<[email protected]>
Sent: Monday, August 18, 2008 12:57 PM
Subject: RE: [AMRadio] Automated Ole Buzzards?
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
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jim Wilhite
Sent: Monday, August 18, 2008 11:07 AM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Automated Ole Buzzards?
KOMA in Oklahoma City, a 50 KW R & R station used a Schaffer
automation system in the 60s. All the music was on 10" tapes run on
Ampex playback machines. The commercials were on carts like these
and they used the Gates carousels. They were a maintenance headache
for sure.
When the engineer took down the main transmitter for maintenance he
also had to do a lot of head and capstan cleaning. They used a non
audible tone to control everything and sometimes there would be a
musical note that would last long enough to fire the next sequence
leading to two sound tracks at the same time. Even today with the
compute control, I hear that happen. It was mesmerizing to watch
that thing in action. Two complete systems, one for operation and
one for back up.
Jim/W5JO
----- Original Message ----- From: "Todd, KA1KAQ"
On Mon, Aug 18, 2008 at 11:05 AM, Robert Nickels
<[EMAIL PROTECTED]> wrote:
Here's everything you'd ever need to achieve AM Immortality -
just program
it to turn on the receiver once in a while, otherwise there
should be enough
capacity here to keep your AM station ole buzzarding long after
your key has
become silent ;-)
Ugh.....maintenance nightmare, migraine alert! Was just discussing
these beasts recently with a list member. Yes - they look much
cooler
than they [reliably] worked!
Jack K9ACT actually built a nifty little loop system for calling
CQ a
year or so back. Works pretty well. Don K4KYV followed suit
sometime
after. That's as much automation as I'd ever want to have in my
station. And those rotary 8-Track-looking beasts are the reason.
There
has to be some audio evidence out there of one going berserk on
the
air. Makes HAL seem like a pre-schooler.
No sleep tonight, the carousel nightmare is sure to return. Thanks
Bob. Thanks a lot.
~ Todd, KA1KAQ (o:
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