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<DIV>Depending on the machine, the start up mode is the first mode. It is
a short term mode to just get the head spinning. We never see it in
operations. It is what I call the hidden mode. Because the head is
at rest, there has to be a way to start it. Once spinning, then we go into
all the rest of the modes.</DIV>
<DIV> </DIV>
<DIV>For review, here are the modes in an RCA machine. </DIV>
<DIV> </DIV>
<DIV>First is Tone Wheel.</DIV>
<DIV> </DIV>
<DIV>This is the most basic mode. No H or V lock.</DIV>
<DIV> </DIV>
<DIV>Next is switch lock.</DIV>
<DIV> </DIV>
<DIV>This is the next step and by controlling the capstan so that it moves the
tape to allow the track with Vertical Sync to be played back in coincidence with
house. This mode is used in the editing process on the record
machine.</DIV>
<DIV> </DIV>
<DIV>Next is to find H lock. </DIV>
<DIV> </DIV>
<DIV>This aligns the H sync with house. The control has to be much
tighter. Within a micro sec or so as the window of the TBC is so
small.</DIV>
<DIV> </DIV>
<DIV>Line Lock is the same as H Lock with out finding vertical first.</DIV>
<DIV> </DIV>
<DIV>I hated it when an operator put the machine in this mode and the on air
switch jumped in MCR. Plus you could not do crawls or IDs over the
tape. </DIV>
<DIV> </DIV>
<DIV>Hope that helped.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 11/15/2013 9:07:39 A.M. Eastern Standard Time,
fkovach@sbcglobal.net writes:</DIV>
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<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN
style="FONT-SIZE: 12pt">I learned through a discussion with Chris Hill that
there are four, and possibly five types of servo lock for this VTR:<BR>1. Tone
wheel lock<BR>2. Switch lock<BR>3. Pix lock<BR>4. Line lock <BR>And a possible
#5. Whatever mode or combo of modes used in starting the tape up.
<BR><BR>Another theory question is the explanation of the "outer loop" and
"inner loop" circuitry used in this machine for the servos. <BR><BR>Thanks for
any help you can give,<BR>Fred</SPAN></FONT><FONT size=2 face=Arial><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"><o:p></o:p></SPAN></FONT></P>
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<DIV>
<P class=MsoAutoSig><FONT color=gray size=3 face="Brush Script MT"><SPAN
style="FONT-FAMILY: 'Brush Script MT'; COLOR: gray; FONT-SIZE: 12pt">Fred
Kovach<o:p></o:p></SPAN></FONT></P>
<P class=MsoAutoSig><FONT color=blue size=2 face=Arial><SPAN
style="FONT-FAMILY: Arial; COLOR: blue; FONT-SIZE: 10pt">Broadcast
Technician<o:p></o:p></SPAN></FONT></P>
<P class=MsoAutoSig><FONT color=blue size=2 face=Arial><SPAN
style="FONT-FAMILY: Arial; COLOR: blue; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoAutoSig><FONT color=blue size=2 face=Arial><SPAN
style="FONT-FAMILY: Arial; COLOR: blue; FONT-SIZE: 10pt">417-848-8381<o:p></o:p></SPAN></FONT></P></DIV>
<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P></DIV><BR><BR>______________________________________________<BR>Please
trim posts to relevant info when replying.<BR><BR>Change subject to reflect
thread direction.
Thanks.<BR>_______________________________________________<BR><BR>Send
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