[QuadList] WRC B/W to Color Quad tape

[Kenneth Zin]

Park, what low pass filter are you using?  look at all of you low pass filter for the VR-1200's find the lowest one, should be 4.2Mhz , that will help.
Most likely you will have to adjust the demod limiter and video balance for the low band color tapes,  ( for the adjustment you will need a spectrum analyzer and a extender board for the demod board)
The side bands in the RF come back to step on the video, narrow the filter.

Kenneth Zin


________________________________
 From: Charles Park Seward <park at videopark.com>
To: Quad List <quadlist at quadvideotapegroup.com> 
Sent: Sunday, January 19, 2014 10:21 AM
Subject: Re: [QuadList] WRC B/W to Color Quad tape
 


Hi Ken,

Hope you are doing well.

I have a question about the early color recordings. I have some low band color recordings from the middle 60s and I see a lot of herringbone interference. Is that because of the frequencies they used? Is there a way to clean that up? 

Best,
Park

C. Park Seward
Cell: 818-535-2747
Home: 541-476-6657
2" Quad and 1" "C" transfers and more
The Transfer Lab at Video Park
Visit us: http://www.videopark.com





On Sep 21, 2009, at 8:52 PM, Kenneth Zin <kenzin at sbcglobal.net> wrote:

> Ted, I do not remember the audio problem with the tape that I received from the LOCK. I have a copy on type "C" one inch some place, I will try to find it.
> I do remember that Hugh Downs was remarking about there new vision mixer that could show two camera at the same time on the screen. The tape that I received is the WRC recording and the one that Ed Retain, Don Kent and Dan Einstein did was the one from Ike's library. The WRC tape was played many times before we at Merlin received WRC's tape. So the WRC tape had some tape damage to it. I built a special demod demphasis for the this tape. I later learned that RCA had two Ampex VR1000's with the signal system removed and RCA signal system installed, as the Ampex had a very stable servo and RCA did not. That hey the audio lip-sync is correct on that tape, Ampex had not change the position of the audio with respect to the video, but 
> RCA was change to be compatible with Ampex, so if you had a old quad tape and the audio was in sync with the video it had to be a Ampex recording, except in this case the year was 1958.
> I had to double the delay line in the Ampex VR-2000 and use a variable capacitor from an Amtec along with three pots to get the color bars to look right, I built a module for the Library of Congress to plug in to play this tape and some of the Fred A. and Ginger R. also.
> Might be more if I think more about that project.
> Regards,
> Ken Zin
> 
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