[QuadList] Looking for contact to retrieve an old show--Remote genlock methods

[David Crosthwait]

Hello Ted,

Yes. Color lock. Although I never have seen it happen, I would imagine that a microwave fade on an incoming feed, where AT&T would switch paths on the fly, might affect system timing in a bad way.

Read more about that and the NBC and ABC methods in pages 212-218 of: ”Television Broadcasting System Maintenance" by Harold E. Ennes, First Edition, First Printing. 


David Crosthwait
DC Video 
www.dcvideo.com

David Crosthwait
DC Video Corp.
Archived Videotape Remastering

3071 N. Lima Street
Burbank, CA 91504
Tel: 818-563-1073
Fax: 818-563-1177
www.dcvideo.com

> On Jul 10, 2017, at 9:37 AM, Ted Langdell via QuadList <quadlist at quadvideotapegroup.com> wrote:
> 
> 
> 
> From: Ted Langdell <Ted at quadvideotapegroup.com>
> Subject: Re: [QuadList] Looking for contact to retrieve an old show--Remote genlock methods
> Date: July 10, 2017 at 9:37:56 AM PDT
> To: David Crosthwait <david at dcvideo.com>
> Cc: Quad List <quadlist at quadvideotapegroup.com>
> 
> 
> David,
> 
> Did that include color as well as monochrome broadcasts?
> 
> You have me trying to remember what Grass Valley Group called it's method of doing something similar.  
> 
> Ted
> 
> Ted Langdell
> Secretary, Quad Videotape Group
> Ted at quadvideotapegroup.com <mailto:Ted at quadvideotapegroup.com>
> (530)301-2931
> 
> Dictated into and Sent from my iPhone, which is solely responsible for any weird stuff I didn't catch.
> 
> 
> On Jul 10, 2017, at 9:30 AM, David Crosthwait <david at dcvideo.com <mailto:david at dcvideo.com>> wrote:
> 
>> Very similar to the CBS “wire-lock“ system to lock remotes to NYC master control. It used a rubidium frequency standard and an audio line to have NYC slowly “steer” the remote sync gen. to be in-phase. While doing hours of OTA digitization of ’68 election coverage and RFK assassination material, it became clear that CBS had this system woking very well. 
>> 
>> 
>> David Crosthwait
>> DC Video Corp.
>> Archived Videotape Remastering
>> 
>> www.dcvideo.com <http://www.dcvideo.com/>
>> https://www.facebook.com/dcvideo/ <https://www.facebook.com/dcvideo/>
>> https://www.dcvideo.com/news/ <https://www.dcvideo.com/news/>
>> 
>> 
>>> On Jul 10, 2017, at 8:47 AM, Chuck Reti via QuadList <quadlist at quadvideotapegroup.com <mailto:quadlist at quadvideotapegroup.com>> wrote:
>>> 
>>> One technical aspect of this that I do remember was that the NOC was sending all feed points an audio tone on one of the telco lines, to use as a kind of gunlock clock.
>>> The tone (don’t remember the freq, could have been 3150) fed a magic box they provided that multiplied it up to 31.5kHz. Our monochrome sync gen had a 31.5 input for this purpose, so we would be in time with everyone else. During pre-feed there were also some tweaks to this, maybe for H-phasing. Our outgoing feed was telco microwave (thanks to Michigan Bell).
>> 
> 
> 
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