[QuadList] Slow Motion Quad

[Chill315 at aol.com]

Sorry not this one either.
 
Chris Hill
 
 
In a message dated 11/14/2011 2:39:52 A.M. Eastern Standard Time,  
ted at quadvideotapegroup.com writes:

Perchance are you Referring to the BBC-modded VR-1000 used in 1964 and  
later?




_http://www.vtoldboys.com/donk01.htm_ (http://www.vtoldboys.com/donk01.htm) 
   


FORWARD BY THE AUTHOR DON  KERSHAW 
It’s now 10 years since I retired from the  BBC, having been in “Tel Rec” 
since I joined in May 1955. I always  intended to write a history of the 
development of Video Recording in the  BBC, and the positions I held, never far 
from the coal face, will  hopefully add authority to the story as it 
unfolds. 


He writes:

ENGINEERING DESIGNS AND RESEARCH  WORK 
Three of the machines were used by Research  and Designs Depts to develop 
special facilities. 
Having been  modified by Research Dept, one of them could be switched to 
play back at  half speed, producing a picture of 405 lines at half the normal 
frame  rate. The displayed picture was then optically converted using a 
vidicon  camera pointing at a specially modified monitor. This was used to  
transmit the first “Slow Motion” playbacks for sporting events around  June ’
64. (Grand National) 
Another, was severely modified by  Designs Dept to produce the notorious 
Slow Motion machine which  eventually was installed at Lime Grove. The tape 
transport was modified  to play one field of a picture normally, store it on a 
very large  diameter floppy disk, playing back from it a repeat whilst the 
tape was  moved back using mechanically reciprocating arms ready to play the 
next  field. Thus, half speed playback was obtained without the quality 
loss  of optical conversion. This was used around July ’66 until July’68 when  
it was replaced by the HS 100. 
The third machine was used by  Research and Designs to develop the 625 line 
High Band recording system  in conjunction with AMPEX which allowed, 
eventually, successful direct  colour recording. The machine was never used 
operationally, but led to  the production of the AMPEX VR 2000 machine. 






Ted


Sent from my iPhone  
(530) 301-2931
Skype: tedlangdell
iChat: flashscan8us


On Nov 13, 2011, at 9:29 PM, Chill315 at aol.com wrote:





A teaser question.
 
Who knows what quad was developed for slow motion playback?
 
Hints:
Fully transistorized.
Had a fixed ratio of one fifth speed.
Developed for an Olympics.  Which one is a bonus point.
 
Answer with photos and technical description later this week.
 
Chris Hill
WA8IGN



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