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'[OT] Recording radio on a video recorder.'
2000\02\08@131030 by Nigel Goodwin

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In message <003201bf71e0$b458e180$9ccb28c3@oemcomputer>, andy howard
<spam_OUTmusicaTakeThisOuTspamUKONLINE.CO.UK> writes
>Someone has mailed me offlist to ask about something I should've
>mentioned in my previous post.
>
>Some video machines do seem to need syncs in order to record audio
>properly. Most that I've tried over the years don't, luckily.

All VHS VCR's require sync to record, it's used to lock the servo
systems - however!, many stereo hi-fi VCR's have a sync generator
already built-in so you can record audio on it's own.
--

Nigel.

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2000\02\08@134942 by norman

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Many years ago I used a video tape recorder to record the entire
AM radio band. I summed in the RF from an antenna after being
amplified along with the video.


I could tune anywhere in the AM and pick up the recorded signal.

It was kind of fun.

Norman


PCS Engineering
Norman Gillaspie
325M Sharon Park Dr. #210
Menlo park, Ca. 94025
Tel 650-854-5263
Fax 650-854-5445
KF6WHG
Email normanspamKILLspampcseng.com


> {Original Message removed}

2000\02\08@135146 by andy howard

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> >Someone has mailed me offlist to ask about something I should've
> >mentioned in my previous post.
> >Some video machines do seem to need syncs in order to record audio
> >properly. Most that I've tried over the years don't, luckily.

> All VHS VCR's require sync to record, it's used to lock the servo
> systems - however!, many stereo hi-fi VCR's have a sync generator
> already built-in so you can record audio on it's own.

Yes, sorry, I should have said *external* sync.

2000\02\08@162453 by norman

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HI,
I worked at a Television station at the time and this was
a goof off middle of the night cure the boredom and curiosity
project.

What I did was amplify an RF signal spectrum using the vertical
amplifier on an oscilloscope. The TEK 465 for example had
a Vertical Amplifier out connector on the rear of the scope.

I took the amplified signal from the antenna and scope. I then
summed this signal with a black burst signal.

It might have been just been a HV sync signal. I then fed this summed signal
into the VCR input.

I then hooked an amplifier to the video out. I then feed this
signal into an AM radio receiver. You could then tune in various stations.


There were dropouts from the head switching wihch added a litlle bit
of a Darth Vader effect. In fact you could slow the audio down
without changing the pitch. It added an echo effect.

I used an old IVC 800 tape machine. BTW if you don't have a time
base corrector the frequency will move around do to tape stretch.

As AM doesn't respond to phase or frequency disturbances the
audio can be detected.


The military has been doing this for years for signal intelligence
work.

I was just goofing off at the time. You could do the same thing now
by using a fast A/D converter card storing the spectrum to disk
and replaying it back out using a D/A.

This is sometime used as a snapshot recorder. You then replay the
spectrum over and over until you extract the information. IE: The
intelligence
you want.

Norman



PCS Engineering
Norman Gillaspie
325M Sharon Park Dr. #210
Menlo park, Ca. 94025
Tel 650-854-5263
Fax 650-854-5445
KF6WHG
Email .....normanKILLspamspam.....pcseng.com


> {Original Message removed}

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