[QuadList] VR-1200B in operation

[COURYHOUSE at aol.com]

I have the stuff for the  first experimental microwave link   from  studio to 
mt wilson... a bell labs  experiment   log  books  by Ken Smith.
 
also have a  pretty good stash of info on TD-2  also.
 
 
 

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_ 
(http://www.quadvideotapegroup.com/) : 
Preserving Tape, Equipment and the Knowledge to use them, in  conjunction 
with the Library of Congress
_ted at quadvideotapegroup.com_ (mailto:ted at quadvideotapegroup.com) 










 
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