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<DIV><FONT size=4>Strange... I don't remember this button on
our</FONT></DIV>
<DIV><FONT size=4>AVR3's... Must be a senior VTR moment!! Also I
don't </FONT></DIV>
<DIV><FONT size=4>remember any tracking problems </FONT><FONT size=4>either with
in-house </FONT></DIV>
<DIV><FONT size=4>or outside tapes...</FONT></DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV><FONT size=4>As I mentioned before... Next to the AVR-1, the
AVR-3</FONT></DIV>
<DIV><FONT size=4>was my second favorite Quad, just ahead of the</FONT></DIV>
<DIV><FONT size=4>VR-2000B!</FONT></DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV><FONT size=4>Don Murray, W4WJ</FONT></DIV>
<DIV><FONT size=4>Retired from 40 years of Miami TV Engineering</FONT></DIV>
<DIV><FONT size=4>35+ years at NBC O&O WTVJ</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 3/13/2011 10:18:37 P.M. Central Daylight Time,
dwnorwood@embarqmail.com writes:</DIV>
<BLOCKQUOTE style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>
<DIV>There has been deafening silence on this pic except for the reply from
Chris and an off-list, correct answer from David Crosthwait.
Congratulations again David! With the weekend coming to a close, I'll go
ahead and post the answer along with the "rest of the story".</DIV>
<DIV> </DIV>
<DIV>The control is the tracking adjustment on an AVR-3. The story
behind the control is really interesting and was told to me a while back by
fellow list member Bill Carpenter. Below is what Bill had to
say.......</DIV>
<DIV> </DIV>
<DIV><EM>This control was added in the "massive retrofit", which I had to
start to correct all the problems.<BR><BR>The tracking control was there, but
we needed a front panel pushbutton, which turned on and off the very poor
autotracking. <BR><BR>I can't remember whether it turned the autotracking on
and off, or whether it just told it to track again!<BR><BR>The control came
from the Tektronix 7000 series scope, and I arranged to buy the controls from
Tek, to solve the problem, and not add another control as part of the
retrofit.<BR><BR>The original design by a well known industry servo design
engineer, would turn ON the dither, find track center, and then freeze that
position, and turn dither OFF.<BR><BR>This is fine for a long tape which was
to playback "to air". <BR><BR>The Hollywood post production marketplace had
over 50 machines, and they found out that the source reels which would have
many "takes", a few seconds long, maybe 30 seconds at best would only track on
the first "take", and then mistrack on most of the others, since the Record
machine had been started and stopped after every take!<BR><BR>This all
happened because the Product Manager had no experience in the Hollywood
marketplace, and was also worrying about the Editing system we were going to
buy from Central Dynamics in Canada, but that's another long sad story, for
another day!<BR><BR>We made the Autotracking work, after the retrofit, with
the control which I sourced from Tek.</EM></DIV>
<DIV><EM>.........................</EM></DIV>
<DIV><EM></EM> </DIV>
<DIV>So, when Chris wondered if it might be part of a vectorscope, he
was almost on the right track! I have some of these controls on a
Tek 7000 series instrument, but this pic was from an AVR-3 and was sent to me
by list member John Pommon. Thanks John! A bit of work in
Photoshop eliminated the "Tracking" label on the panel and turned it into
B&W to hide the panel color. The AVR-3 doesn't get much discussion
on the list, but it had been active recently so I thought it would be a good
time for this one. Next week, off in a different direction........</DIV>
<DIV> </DIV>
<DIV>Don Norwood<BR>Digitrak Communications, Inc.<BR><A title=http://www.digitrakcom.com/ href="http://www.digitrakcom.com/">www.digitrakcom.com</A></DIV>
<BLOCKQUOTE style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=mailto:dwnorwood@embarqmail.com href="mailto:dwnorwood@embarqmail.com">Don Norwood</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=mailto:quadlist@quadvideotapegroup.com href="mailto:quadlist@quadvideotapegroup.com">Quad List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, March 12, 2011 12:40
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [QuadList] Weekend Mystery Pic
for 3/12/11</DIV>
<DIV><BR></DIV>
<DIV>For this weekend's challenge, identify the function of this control and
what machine it is on. As far as I know, it is the only control
of this design on any quad machine.</DIV>
<DIV> </DIV>
<DIV><IMG SRC="cid:X.MA1.1300073354@aol.com" border=0 hspace=0 alt="" align=baseline DATASIZE="18168" ID="MA1.1300073354" ></DIV>
<DIV> </DIV>
<DIV>Don Norwood<BR>Digitrak Communications, Inc.<BR><A title=http://www.digitrakcom.com/ href="http://www.digitrakcom.com/">www.digitrakcom.com</A></DIV>
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