[QuadList] save htis and look tr4 converts to hi band but alsoneed modul...

[Bill Carpenter]

Hi Folks,
The Ampex VPR-20 had a Hetrodyne color adapter which allowed you to playback color in the field for review purposes.It had a RF (channel 3 or 4) output, I used it at NAB in 1981, on a hand truck type of camera/recorder roll around remote which I built with a 12" Sony TV set. 

We would show it side by side with a 19" Zenith TV set next to a color monitor with the same output fed thru a external TBC in most trade shows.

It was based on a chip, probably from National Semiconductor.and was packaged in a shielded metal box and was about 3" x 9" x 1/2" and it was an option which fit inside the case, This was an Al Trost design and worked very well.
The Sony device was a similar design by Len Kowal ( He worked with me in Elk Grove @ Ampex) and was built in his small San Jose shop. It was a 1RU standalone device.
This chip was the basis for the color playback on many VHS machines, and would not make Pal-M color, even if you tried to inject a proper color subcarrier, which we tried @ TV Globo in Rio during Carnival in early 80's. 

We destroyed the chip in Globo's Advance engineering lab, which was run by Jose Dias, who was the VP of Advanced Engineering for TV Globo, 

He got the money which started Pacific Data Images in Palo Alto in the 80's to get Pal-M color animation for TV Global. A great hands-on engineer and a good friend.

 
Bye for now, Bill & Gewyn & Ginger (whoof...whoof)


________________________________
 From: "COURYHOUSE at aol.com" <COURYHOUSE at aol.com>
To: quadlist at quadvideotapegroup.com 
Sent: Saturday, April 7, 2012 12:30 AM
Subject: Re: [QuadList] save htis and look tr4 converts to hi band but alsoneed modul...
 

you bring up an interesting point David with the   BVH 500 one 
inch machine.. they had a 'color adapter or  something  for  
viewing/// we  would love to  find one    for  our 
BVH 500 we also have the   vpr 20?  the  Ampex  brother 
to the  BVH 500... I assume it  needs an adapter  for good 
viewing also!?
 
 
In a message dated 4/6/2012 10:16:04 A.M. US Mountain Standard Time, 
david at dcvideo.com writes:
Ed,
>
>
>Congratulations on your acquisition. The TR 5 was a stripped down machine  that enabled it to be more mobile. Therefore many of the correction circuits  used to fully reproduce a broadcast quality playback picture were not included  in this machine. Although the recording will be a good one (if all is working  OK), you will only see demodulated video upon play back that will give you a  good sense that a recording was made. Without the RCA correction circuitry  such as CATC for color time base correction, CAVEC for velocity correction and  the color dropout compensator option, the recovered picture (depending on the  options used as on any 2" machine) may be raw, flickering color (if color is  present). So in the remote truck, the operator upon conclusion of a record  session could verify that a recording had been made by playing back this  "demod" picture. An analysis of the FM (RF) and control track signals on the  scope added further confidence that
 all was OK. An experienced operator who  knew the machine well would have a better sense of confidence than one who was  not, therefore being more at ease with a "demod" only picture. It is a bit of  a leap of faith to tell the director in the truck that all will look fine upon  playback of his show in the studio on a fully optioned playback machine.
>
>
>Years later when the first portable field one-inch type C VTR's came out  such as the Sony BVH 500, it was typical to confirm the integrity of the  recording by observing the same "demod" only picture with no time base  correction.
>
>
>Your might be interested to know that the RCA list price for a TR 5 was  $20, 950 in 1966.
>
>
>Best  Regards,
>
>David Crosthwait
>DC Video
>Videotape Transfers and  More!
>
>Offices located at:
>177 West Magnolia 
  Blvd.
>Burbank, CA. 91502
>818-563-1073
>818-563-1177 
  (fax)
>818-285-9942 (cell)
>
>david at dcvideo.com
>www.dcvideo.com
>
> 
>Follow DC Video on  Facebook:https://www.facebook.com/dcvideo 
>
 
Please trim posts to relevant info when replying.

Change subject to reflect thread direction. Thanks.
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