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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Can I just throw in an hand grenade<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Yes the capstan is locked to the head in record, so tape speed
is a product of capstan diameter only<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The dimension stability of tape is not good as temperature changes
so does its length so the track measurements change<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hence helical scan required AST before slo-mo came along just to
have interchange or to play back the tape recorded at a different
temperature<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Remember the 7900, machines and poor interchange<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Worst case in quad is an assembly edit, where you change from
control track controlled speed to a speed set by the diameter of the capstan<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hence the pip on the ramp on RCA machines, push the toggle and
it needs to hold for 4 seconds or you edit might fall apart, (set Capstan free
run)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Trevor Brown<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>UK<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
quadlist-bounces@quadvideotapegroup.com
[mailto:quadlist-bounces@quadvideotapegroup.com] <b>On Behalf Of </b>georgenann@aol.com<br>
<b>Sent:</b> 27 January 2010 16:40<br>
<b>To:</b> quadlist@quadvideotapegroup.com<br>
<b>Subject:</b> Re: [QuadList] Cap Disc<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Helvetica","sans-serif";color:black'>-----Original Message-----<br>
From: Don Norwood <dwnorwood@embarqmail.com><br>
To: Quad List <quadlist@quadvideotapegroup.com><br>
Sent: Tue, Jan 26, 2010 10:42 pm<br>
Subject: Re: [QuadList] Cap Disc<o:p></o:p></span></p>
<div id="AOLMsgPart_3_22b502fc-355e-4414-ab9a-9d138e9d1159">
<div>
<p class=MsoNormal><strong><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'>New replies in </span></strong><strong><span style='font-size:
10.0pt;font-family:"Helvetica","sans-serif";color:green'>GREEN</span></strong><strong><span
style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>
below.....</span></strong><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'><o:p></o:p></span></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0cm 0cm 0cm 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>----- Original Message ----- <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal style='background:#E4E4E4'><b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'>From:</span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> <a
href="mailto:georgenann@aol.com" title="georgenann@aol.com">georgenann@aol.com</a>
<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Subject:</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'> Re: [QuadList] Cap Disc<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Helvetica","sans-serif";color:black'>-----Original Message-----<br>
From: Don Norwood <<a href="mailto:dwnorwood@embarqmail.com">dwnorwood@embarqmail.com</a>><o:p></o:p></span></p>
<div id="AOLMsgPart_3_f228e533-09a4-4a51-be7a-72dd7efef698">
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'>My post about changing the speed of the capstan was referring to
your description of what was done to the pulleys on VR-2000 or 1200
machines. Unless I'm missing something, that would change the tape speed,
which in turn changes the video track specifications.<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><strong><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Well, it might change the tape speed if it weren't for the servo,
it just put it into a slightly different range, one the servo seemed to like a
little better.</span></strong><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><strong><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:green'>Agreed, but ONLY for playback where the capstan speed is controlled
by the servo. If the machine is for playback only, no problem, although I
would have guessed that an electronic modification would have been much
easier. My concern would be in record, where the
capstan is fed a fixed frequency, and therefore the speed is affected by
the mechanics. The servo has no way of knowing what the actual velocity
of the tape is in record. If it has been changed by a mechanical
modification, then the track alignment will be non-standard.</span></strong><span
style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><strong><u><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:green'>The capstan is always under servo control. It is derived
from the head tach. The head is locked to V, either re or incoming video.</span></u></strong><span
style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Nobody ever came up with an electronic mod for this, I don't know
why, will have to think about this.</span><span style='font-size:10.0pt;
font-family:"Helvetica","sans-serif";color:black'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><strong><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>I remember those damn round chips in bd 9, 10. I whish they
had left them alone, they made it hard to get a scope in there to troubleshoot.
Board 14 was reframing?? I don't recall having any problem with it so left it
alone.</span></strong><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><strong><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:green'>Yes, 14 is mostly reframing. After many years, the relays on
the board can be problematic and cause trouble with normal servo operation.</span></strong><span
style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><strong><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>You sure have a great memory, you should write a book on the
history of the servo, kind of like the big Rolex or Vibroplex history books.
(Just kidding). Tnx fer the info it is interesting. I didn't get
into the machines till the 70's.</span></strong><span style='font-size:10.0pt;
font-family:"Helvetica","sans-serif";color:black'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><strong><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:green'>I got into the machines in the early 70's, and it's not my memory
that's great, it's just that I have collected as much reference material as
possible. Since I still work on these, some things are more easily
recalled than others, but I still have to look up a lot of stuff!</span></strong><span
style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><strong><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:green'>Don</span></strong><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><strong><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:green'>Lucky guy, it sure was fun.</span></strong><span style='font-size:
10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><strong><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:green'>Tnx Agn</span></strong><span style='font-size:10.0pt;font-family:
"Helvetica","sans-serif";color:black'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";
color:black'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><strong><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:green'>DE GK</span></strong><span style='font-size:10.0pt;font-family:
"Helvetica","sans-serif";color:black'><o:p></o:p></span></p>
</div>
</div>
</div>
</blockquote>
</div>
<div id="AOLMsgPart_4_22b502fc-355e-4414-ab9a-9d138e9d1159"><pre
style='background:white'><tt><span style='color:black'>_______________________________________________<o:p></o:p></span></tt></pre><pre
style='background:white'><tt><span style='color:black'>Please trim posts to relevant info when replying!<o:p></o:p></span></tt></pre><pre
style='background:white'><tt><span style='color:black'>Send QuadList list posts to <a
href="mailto:QuadList@quadvideotapegroup.com">QuadList@quadvideotapegroup.com</a><o:p></o:p></span></tt></pre><pre
style='background:white'><tt><span style='color:black'>Your subscribe, unsubscribe and digest options are here:<o:p></o:p></span></tt></pre><pre
style='background:white'><tt><span style='color:black'><a
href="http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com"
target="_blank">http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com</a><o:p></o:p></span></tt></pre></div>
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