[QuadList] VR-1200B in operation

[Ted Langdell]

Hi, Park,

On Dec 2, 2008, at 8:20 AM, C. Park Seward wrote:

> The TV sitcom looks especially good as a direct recording from the  
> network line.


Sounds like fun! Enjoyed the video.

Do you know when and at what point along the CBS network the Green  
Acres recording was made?

Wondering how the sound sounds... since in the early days of network  
television had sound carried by conventional copper, like radio  
network sound and picture was carried by coax and microwave relay.

Not sure when AT&T piggybacked the sound with the picture—called  
"multiplexing" as I recall—but David Crosthwait has mentioned the  
relatively inferior quality of recordings made "off the line"  at  
West Coast points (including network delay centers in LA and Burbank)  
because of the limited frequency response of the separate audio lines.

The telco folks also had to work out some sound/picture sync issues  
because the sound and picture had different propagation  
characteristics due to the technology used for each.

After they learned to multiplex the audio with video and delivered it  
on—want to say 110ohm balanced copper—things got better in terms of  
frequency response, and audio-video out of sync issues.

I googled a while to find some links to the multiplexing process, but  
didn't come up with anything.  As I recall, the video went as  
baseband, and the audio was on a carrier above the video.


Ted Langdell
209 East 12th Street
Marysville, CA 95901
Main: 	(530) 741-1212
Cell: 	(530) 301-2931

Secretary for the  QuadVideotapeGroup.com:
Preserving Tape, Equipment and the Knowledge to use them, in  
conjunction with the Library of Congress
ted at quadvideotapegroup.com

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