<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Hello Ted,</div><div class=""><br class=""></div>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.<div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class=""><br class=""><div class="">
David Crosthwait<br class="">DC Video <br class=""><a href="http://www.dcvideo.com" class="">www.dcvideo.com</a>
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David Crosthwait<br class="">DC Video Corp.<br class="">Archived Videotape Remastering<br class=""><br class="">3071 N. Lima Street<br class="">Burbank, CA 91504<br class="">Tel: 818-563-1073<br class="">Fax: 818-563-1177<br class=""><a href="http://www.dcvideo.com" class="">www.dcvideo.com</a>
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<br class=""><div><blockquote type="cite" class=""><div class="">On Jul 10, 2017, at 9:37 AM, Ted Langdell via QuadList <<a href="mailto:quadlist@quadvideotapegroup.com" class="">quadlist@quadvideotapegroup.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><br class=""><br class=""><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(127, 127, 127, 1.0);" class=""><b class="">From: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">Ted Langdell <<a href="mailto:Ted@quadvideotapegroup.com" class="">Ted@quadvideotapegroup.com</a>><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(127, 127, 127, 1.0);" class=""><b class="">Subject: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><b class="">Re: [QuadList] Looking for contact to retrieve an old show--Remote genlock methods</b><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(127, 127, 127, 1.0);" class=""><b class="">Date: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">July 10, 2017 at 9:37:56 AM PDT<br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(127, 127, 127, 1.0);" class=""><b class="">To: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">David Crosthwait <<a href="mailto:david@dcvideo.com" class="">david@dcvideo.com</a>><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(127, 127, 127, 1.0);" class=""><b class="">Cc: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">Quad List <<a href="mailto:quadlist@quadvideotapegroup.com" class="">quadlist@quadvideotapegroup.com</a>><br class=""></span></div><br class=""><br class=""><meta http-equiv="content-type" content="text/html; charset=utf-8" class=""><div dir="auto" class=""><div class="">David,<br class=""><br class="">Did that include color as well as monochrome broadcasts?</div><div class=""><br class=""></div><div class="">You have me trying to remember what Grass Valley Group called it's method of doing something similar. </div><div class=""><br class=""><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">Ted</span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class=""><br class=""></span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">Ted Langdell</span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">Secretary, Quad Videotape Group</span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class=""><a href="mailto:Ted@quadvideotapegroup.com" class="">Ted@quadvideotapegroup.com</a></span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">(530)301-2931</span></div><div class=""><br class=""></div><span style="background-color: rgba(255, 255, 255, 0);" class="">Dictated into and Sent from my iPhone, which is solely responsible for any weird stuff I didn't catch.</span><br class=""><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class=""><br class=""></span></div></div><div class=""><br class="">On Jul 10, 2017, at 9:30 AM, David Crosthwait <<a href="mailto:david@dcvideo.com" class="">david@dcvideo.com</a>> wrote:<br class=""><br class=""></div><blockquote type="cite" class=""><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class="">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. <div class=""><br class=""></div><div class=""><br class=""><div class="">
David Crosthwait<br class="">DC Video Corp.<br class="">Archived Videotape Remastering<br class=""><br class=""><a href="http://www.dcvideo.com/" class="">www.dcvideo.com</a>
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<br class=""><div class=""><blockquote type="cite" class=""><div class="">On Jul 10, 2017, at 8:47 AM, Chuck Reti via QuadList <<a href="mailto:quadlist@quadvideotapegroup.com" class="">quadlist@quadvideotapegroup.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">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.</div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">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).</div></div></blockquote></div><br class=""></div></div></blockquote></div><br class=""><br class="">______________________________________________<br class="">Please trim posts to relevant info when replying.<br class=""><br class="">Change subject to reflect thread direction. Thanks.<br class="">_______________________________________________<br class=""><br class="">Send QuadList list posts to <a href="mailto:QuadList@quadvideotapegroup.com" class="">QuadList@quadvideotapegroup.com</a><br class="">Your subscribe, unsubscribe and digest options are here:<br class=""><a href="http://quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com" class="">http://quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com</a></div></blockquote></div><br class=""></div></body></html>