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<DIV>We are all missing the point. There are some things that are correct
and some that is a misunderstanding.</DIV>
<DIV> </DIV>
<DIV>The SMPTE specification is what sets the track imprint on the tape.
ANSI Standard C98.6-1965. The specification for the distance between four
tracks is .0625. (Four tracks are used because of the possibility of
quadrature.) This is the only thing that counts so that interchange will
be possible. There is only one specification and it does not care if the
signal is color or black and white. Anything that is done to a machine
must still keep the footprint on the tape the same. Tape speed is defined
by ANSI standard C98.4-1963. It is based upon 60 Hz vertical. The
note states that the change to 59.94 will result in a proportional change.</DIV>
<DIV> </DIV>
<DIV>Record mode requires the head and capstan be locked together. The 240
from the head is used to lock the capstan in record mode. The 240 from the
head is used to make a control track. This is recorded on the
lower part of the tape. The frame pulse is recorded to tell where
vertical is located. </DIV>
<DIV> </DIV>
<DIV>The diameter of the capstan will determine the amount of tape that is
pulled through each second. It is made to a .0001 tolerance so that the
amount is 15 inches every second. It is also this that sets the distance
between the head tracks. Thus the need for a very precise capstan.
If two capstans are different sizes even within the .0001 tolerance, over an
hour they will pull a slightly different amount of tape through.</DIV>
<DIV> </DIV>
<DIV>Tape speed is governed by the diameter of the capstan shaft and
pulley. Its rotation is set by the incoming video. The only thing
that determines how much tape is pulled through is the mechanical sizes.
Nothing more. If any pulley diameter or capstan diameter is modified,
the machine will no longer record signals to the SMPTE specification. This
is unacceptable to maintain the SMPTE specification and interchange.</DIV>
<DIV> </DIV>
<DIV>The bandwidth of the servo allows for the change from monochrome to color
recordings with out a problem. Since the head is locked to the vertical, and
thus the capstan is locked to the head, then the machine could care less what is
going into it. </DIV>
<DIV> </DIV>
<DIV>There has never been an issue about color and monochrome capstan
sizes. Since the very first days, the machines from RCA and AMPEX have
been used to record both color and black and white. There was never a
change to the VR-1000 or the TRT to change out the capstan for color. I
had the TRT and am aware of every modification that was done to the
machine. </DIV>
<DIV> </DIV>
<DIV>Playback will make the tape speed be what it was in the record mode.
The machine is now locked to house and the head and capstan are locking tape to
the house. Thus any minute speed variations will be compensated for.
Time base correctors or their windows do not have any influence on the
speed. </DIV>
<DIV> </DIV>
<DIV>Lock up modes. There are a series of steps that he machine goes
through. The head requires a start up mode so that it can come up to
speed. Then it changes to different modes as it goes through the
process. One of the things that is also done is to have a boost applied to
the reel motors. This will affect the tape speed during the boost
cycle.. This boost is released after a fixed time. </DIV>
<DIV> </DIV>
<DIV><FONT size=3><U>The real answer is to ask Charles Anderson what the story
is. Maybe Tim can do this and we can finally put this one to
bed.</U></FONT></DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV></FONT></BODY></HTML>