Stereo on 2 inch Quad

Thu Aug 21 19:21:48 CDT 2014

IRT electronics in Australia developed a stereo system for MTV when they
started to allow stereo on their quad cart machines.
The system was also commonly used by the networks in Australia.
I have some details of the system somewhere and I'll post them when I
find them.

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Subject: QuadList Digest, Vol 74, Issue 17

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Today's Topics:

   1. RE: Two Inch Quad Stereo Recording (Mitch Hopper)
   2. Two Inch Quad Stereo Recording (David Crosthwait)
   3. More on Two Inch Quad Stereo Recording (joe at snelson.tv)
   4. Re: Two Inch Quad Stereo Recording--NBC Burbank--PCM Audio
at
      NBC-NY (Ted Langdell)

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Message: 1
Date: Thu, 21 Aug 2014 12:16:42 -0500
From: "Mitch Hopper" <id at brainmist.com>
To: "'David Crosthwait'" <david at dcvideo.com>,	"'Quad List'"
	<quadlist at quadvideotapegroup.com>
Subject: RE: [QuadList] Two Inch Quad Stereo Recording
Message-ID: <000f01cfbd63$ae166930$0a433b90$@brainmist.com>
Content-Type: text/plain; charset="us-ascii"

We dabbled a short time in the early 70s with L+R on the main track and
L-R on the cue.  I think it was for the Illinois High School Orchestra
competitions. Don't remember much, but the competition was in Chicago
and used WTTWs truck and quads and audio aired on WBEZ. (Maybe - it's
all a little foggy after all this time).

J. Mitch Hopper

Custom Video Systems Co.

536 E. Mill St.

Rochester, IL  62563

id at brainmist.com

From: QuadList [mailto:quadlist-bounces at quadvideotapegroup.com] On
Behalf Of David Crosthwait via QuadList
Sent: None
To: Quad List
Subject: [QuadList] Two Inch Quad Stereo Recording

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Message: 2
Date: Thu, 21 Aug 2014 11:01:29 -0700
From: David Crosthwait <david at dcvideo.com>
To: Quad List <quadlist at quadvideotapegroup.com>
Subject: Two Inch Quad Stereo Recording
Message-ID: <8DC3288D-C843-42D8-BFAE-954D5703FCB2 at dcvideo.com>
Content-Type: text/plain; charset="windows-1252"

Hello Mitch,

When NBC Burbank went stereo throughout the plant via the new Master
Grid NEC router, stereo was handled via L+R and L-R per New York
directive. It was determined to be a mess and was abandoned around 1983.

David

On Aug 21, 2014, at 10:16 AM, Mitch Hopper via QuadList wrote:

> 
> 
> From: "Mitch Hopper" <id at brainmist.com>
> Subject: RE: [QuadList] Two Inch Quad Stereo Recording
> Date: August 21, 2014 10:16:42 AM PDT
> To: "'David Crosthwait'" <david at dcvideo.com>, "'Quad List'" 
> <quadlist at quadvideotapegroup.com>
> 
> 
> We dabbled a short time in the early 70s with L+R on the main track
and L-R on the cue.  I think it was for the Illinois High School
Orchestra competitions. Don't remember much, but the competition was in
Chicago and used WTTWs truck and quads and audio aired on WBEZ? (Maybe -
it's all a little foggy after all this time).
>  
>  
> J. Mitch Hopper
> Custom Video Systems Co.
> 536 E. Mill St.
> Rochester, IL  62563
> id at brainmist.com
>  

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Message: 3
Date: Thu, 21 Aug 2014 14:58:11 -0700
From: <joe at snelson.tv>
To: quadlist at quadvideotapegroup.com
Subject: More on Two Inch Quad Stereo Recording
Message-ID:

<20140821145811.b2137354135fee390ebc9f680a00ff15.819a1eaa20.wbe at email04.
secureserver.net>

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Message: 4
Date: Thu, 21 Aug 2014 16:45:12 -0700
From: Ted Langdell <ted at quadvideotapegroup.com>
To: David Crosthwait <david at dcvideo.com>,	Quad List
	<quadlist at quadvideotapegroup.com>
Cc: Ted Langdell <ted at quadvideotapegroup.com>
Subject: Re: [QuadList] Two Inch Quad Stereo Recording--NBC
	Burbank--PCM Audio	at NBC-NY
Message-ID:
	<EABE2D0B-C939-434B-BA36-26066C9C832F at quadvideotapegroup.com>
Content-Type: text/plain; charset="us-ascii"

On Aug 21, 2014, at 11:01 AM, David Crosthwait via QuadList wrote:

> When NBC Burbank went stereo throughout the plant via the new Master
Grid NEC router, stereo was handled via L+R and L-R per New York
directive. It was determined to be a mess and was abandoned around 1983.
> 
> David

A picture of NEC's router and mention of the use in Burbank is mentioned
on the inside front cover of this Broadcast Engineering issue:
http://www.americanradiohistory.com/Archive-Broadcast-Engineering/BE/70s
/BE-1979-05.pdf

David, 

Were tapes recorded with this "sum/difference" audio?  I would imagine
that would make for a fun time when one of these is encountered in an
archive.

The April/May 1976 issue of RCA Engineer has a comprehensive package of
articles on NBC NY's facilities for switching, transmission and machine
control:
http://www.americanradiohistory.com/Archive-RCA-Engineer/1976-04-05.pdf

On Page 42, there's an article about how Pulse Code Modulation was used
to put four audio channels into the video for routing within the NY
facilities. What happens at VTRs is described.  There were 44 VTRs and
cart machines in NY at the time.

See next post about what else is in the BE issue.

Cheers,

Ted

Ted Langdell
Secretary
Quad Videotape Group
e-mail:	ted at quadvideotapegroup.com

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