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<DIV>The AMTEC worked on a different principle than a digital TBC. The
AMTEC used a sample the leading edge of sync and compare it to house
method. Then immediately change the variable delay line after that.
That is why the switch pulse has to be in the front porch of the sync
interval. If you do it in the back porch, then the relationship of the
video would possibly change on the line with the switch. Leading edge has
to be used as sync width varies between sources. </DIV>
<DIV> </DIV>
<DIV>It would never have to digitize the signal like the TBC of today.
</DIV>
<DIV> </DIV>
<DIV>Digital TBC's work in many different ways.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV>WA8IGN</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 4/30/2011 9:54:41 A.M. Eastern Daylight Time,
georgenann@aol.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><FONT color=black size=2 face=arial>
<DIV>Thank You, David,</DIV>
<DIV> </DIV>
<DIV>Your memory is better than most TBC's.</DIV>
<DIV> </DIV>
<DIV>Roger on the head switch point, that is where most digital TBC's
failed. I don't understand why a digital tbc with a 8 or 16 line window
can't seem to handle it but the Ampex Amtec could. </DIV>
<DIV> </DIV>
<DIV>73,</DIV>
<DIV> </DIV>
<DIV>George Keller<BR><BR></DIV>
<DIV style="CLEAR: both"></DIV><BR><BR>
<DIV style="FONT-FAMILY: arial,helvetica; COLOR: black; FONT-SIZE: 10pt">-----Original
Message-----<BR>From: David Crosthwait <david@dcvideo.com><BR>To: Quad
List <quadlist@quadvideotapegroup.com><BR>Sent: Sat, Apr 30, 2011 9:07
am<BR>Subject: Re: [QuadList] TBC<BR><BR>
<DIV id=AOLMsgPart_2_943b1f82-17ec-447b-b3ab-bf6cc3c1e07b>George,
<DIV><BR></DIV>
<DIV>No I did not try the suppression pulse mode. The ability to handle a head
switch is the key as far as I am concerned. Also, some of these boxes don't
like incoming noise and spiky video. Yes, I do recall the 516, but I seem to
recall that this was more suited for 3/4" processing and did not have direct
color processing. Have the spec. sheets in the file I think. The 520 and 590
had more memory also perhaps. I think these products hit the market in 1974 or
so, maybe later?. When you open up these devises to take a peak, it's a
massive amount of circuitry, top and bottom of the unit, that is now
approaching 40 years in age. They have a lot of pots to adjust, which need
constant tweaking. </DIV>
<DIV><BR></DIV>
<DIV>NBC Burbank had a 590 on a TR 70A for a month tryout at one time. That
was the duration of that unit as it went back. I did operate a VR 1200/CVS520
on an NCAA Basketball game in Dayton Ohio one time (don't recall who's truck
but may have been Multimedia/WLWT). It did the job it was supposed to do, but
that was 1979.</DIV>
<DIV><BR></DIV>
<DIV>
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<DIV style="WORD-WRAP: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space">
<DIV>
<DIV>
<DIV>
<DIV>Best Regards,</DIV>
<DIV><BR></DIV>
<DIV>
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<DIV style="WORD-WRAP: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space">
<DIV>
<DIV>
<DIV>David Crosthwait</DIV>
<DIV>DC Video</DIV>
<DIV><SPAN style="FONT-SIZE: 10px" class=Apple-style-span><A title=mailto:DAVID@DCVIDEO.COM href="mailto:DAVID@DCVIDEO.COM">DAVID@DCVIDEO.COM</A></SPAN></DIV>
<DIV><FONT class=Apple-style-span size=2><SPAN style="FONT-SIZE: 10px" class=Apple-style-span><A title=http://www.dcvideo.com/ href="http://www.dcvideo.com/" target=_blank>WWW.DCVIDEO.COM</A></SPAN></FONT></DIV></DIV></DIV>
<DIV><FONT class=Apple-style-span size=2><BR></FONT></DIV></DIV></SPAN></SPAN></DIV></DIV></DIV></DIV></DIV></DIV></SPAN></DIV></SPAN></DIV></SPAN><BR class=Apple-interchange-newline></SPAN><BR class=Apple-interchange-newline></DIV><BR>
<DIV>
<DIV>On Apr 30, 2011, at 5:16 AM, george keller wrote:</DIV><BR class=Apple-interchange-newline>
<BLOCKQUOTE type="cite"><FONT color=black size=2 face=arial>
<DIV><WBR>Thank You!! Great memory. The other one was perhaps a
516. Did you try the suppression pulse route and did it help at all
with any other TBC's? I tried it with Sony TBC2000 and 1000. Try monochrome?
I really had no luck to mention withe either one.</DIV>
<DIV> </DIV>
<DIV>MNY TNX,</DIV>
<DIV> </DIV>
<DIV>George Keller<BR><BR></DIV>
<DIV style="CLEAR: both"></DIV><BR><BR>
<DIV style="FONT-FAMILY: arial,helvetica; COLOR: black; FONT-SIZE: 10pt">-----Original
Message-----<BR>From: David Crosthwait <<A title=mailto:david@dcvideo.com href="mailto:david@dcvideo.com">david@dcvideo.com</A>><BR>To: Quad List
<<A title=mailto:quadlist@quadvideotapegroup.com href="mailto:quadlist@quadvideotapegroup.com">quadlist@quadvideotapegroup.com</A>><BR>Sent:
Fri, Apr 29, 2011 8:33 pm<BR>Subject: Re: [QuadList] TBC<BR><BR>
<DIV id=AOLMsgPart_2_b85b9211-b879-42a9-b2f5-a84fa7c92838>George,
<DIV><BR></DIV>
<DIV>That was the CVS 520 and the later CVS or Harris 590. Been there, done
that with those boxes!</DIV>
<DIV><BR>
<DIV><SPAN style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; BORDER-COLLAPSE: separate; FONT: medium Helvetica; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; WORD-SPACING: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px" class=Apple-style-span><SPAN style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; BORDER-COLLAPSE: separate; FONT: medium Helvetica; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; WORD-SPACING: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px" class=Apple-style-span>
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<DIV style="WORD-WRAP: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space">
<DIV>
<DIV>
<DIV>
<DIV>Best Regards,</DIV>
<DIV><BR></DIV>
<DIV>
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<DIV style="WORD-WRAP: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space">
<DIV>
<DIV>
<DIV>David Crosthwait</DIV>
<DIV>DC Video</DIV>
<DIV>Archived Media Transfer and Re-mastering Services</DIV>
<DIV><BR></DIV>
<DIV><FONT class=Apple-style-span size=2><SPAN style="FONT-SIZE: 10px" class=Apple-style-span>Offices located at:</SPAN></FONT></DIV>
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<DIV>
<DIV>On Apr 29, 2011, at 3:34 PM, george keller wrote:</DIV><BR class=Apple-interchange-newline>
<BLOCKQUOTE type="cite"><FONT color=black size=2 face=arial>
<DIV>CVS had a DTBC it had either a 16 or 20 in it's model number which
had an optional extra wired in small board mod for segmented
machines. There may still be some around, but look for the
board. AF put one in a 1200 D or E(?) and made it smaller than an
AVR 2, you could roll it around anywhere.</DIV>
<DIV> </DIV>
<DIV>I have also played wilth DTBC's and the 2000 also with no real
luck. Widening out the supression pulse and moving it around showed
some noticable results, but no cigar. Might not have too bad in
mono, but never tried it.<BR></DIV>
<DIV> George Keller<BR></DIV>
<DIV style="CLEAR: both"></DIV><BR><BR>
<DIV style="FONT-FAMILY: arial,helvetica; COLOR: black; FONT-SIZE: 10pt">-----Original
Message-----<BR>From: Don Norwood <<A title=mailto:dwnorwood@embarqmail.com href="mailto:dwnorwood@embarqmail.com">dwnorwood@embarqmail.com</A>><BR>To:
Quad List <<A title=mailto:quadlist@quadvideotapegroup.com href="mailto:quadlist@quadvideotapegroup.com">quadlist@quadvideotapegroup.com</A>><BR>Sent:
Fri, Apr 29, 2011 5:53 pm<BR>Subject: Re: [QuadList] TBC<BR><BR>
<DIV style="BACKGROUND-COLOR: #fff; MARGIN: 0px; FONT-FAMILY: Tahoma, Verdana, Arial, Sans-Serif; COLOR: #000; FONT-SIZE: 12px" id=AOLMsgPart_0_1fea796d-1d42-4958-867e-e4fa6055c776><PRE style="FONT-SIZE: 9pt"><TT>Shai:
The design is very different. I have tried many different models, not
expecting them to work, but just out of curiosity. NONE of them, from
older, early generation TBC's to very modern designs will work. There are
two main problems.....first is the different nature of the timing error
between segmented and helical, and second is that many of the early designs
as well as later and less expensive models were not designed for use with
direct color recovery. They rely on the heterodyne processing in the VTR to
recover the color signal, and that's the market that most of the TBC's were
designed for.
Merlin used several different models of NEC TBC's but I believe most of them
required some degree of modification. They also used an Adda VW-2 and an
Ampex TBC-800, both with some mods . You can find info on these on our
website on the Merlin Literature page.
Don Norwood
Digitrak Communications, Inc.
<A title=http://www.digitrakcom.com/ href="http://www.digitrakcom.com/" target=_blank>www.digitrakcom.com</A>
----- Original Message -----
From: "Shai Drori" <<A title=mailto:srdbx@netvision.net.il href="mailto:srdbx@netvision.net.il">srdbx@netvision.net.il</A>>
To: <<A title=mailto:quadlist@quadvideotapegroup.com href="mailto:quadlist@quadvideotapegroup.com">quadlist@quadvideotapegroup.com</A>>
Sent: Friday, April 29, 2011 11:32 AM
Subject: Re: [QuadList] TBC
> Why is that? I thought that maybe an old TBC might be able to handle this?
> Has anyone tried this before? Also, what do I do with LB on an AVR-2? Ken
> Zin looks very busy at the moment I doubt he'll have time for me now to
> talk about his cards. Is the avr-1 and tr-70 the only multistandard
> machines?
> Shai
>
> On 29/04/2011 11:00, <A title=mailto:quadlist-request@quadvideotapegroup.com href="mailto:quadlist-request@quadvideotapegroup.com">quadlist-request@quadvideotapegroup.com</A> wrote:
>> The problem is that the TBC must be designed for segmented scan. VERY
>> FEW
>> ever were, and I'm not aware that any on the market today or in recent
>> years
>> will work for anything other than non-segmented (helical) scan.
>>
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