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<DIV>Herringbone is a fact of life. The moire was one of the reasons that
High Band was developed. The other reason was PAL has a higher bandwidth
and it is necessary to go to High Band to have a better result.</DIV>
<DIV> </DIV>
<DIV>I do not know of a way to reduce it. Do check the demod out to make
sure that the set up is correct so that rf is reduced. Other than that, no
idea.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV>WA8IGN</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 1/19/2014 11:19:49 P.M. Eastern Standard 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><BR>----- Original Message ----- <BR>From: "Charles Park
Seward"<BR>><BR>> I have a question about the early color recordings. I
have some low band <BR>> color recordings from the middle 60s and I see a
lot of herringbone <BR>> interference. Is that because of the frequencies
they used? Is there a way <BR>> to clean that up?<BR><BR>Hi
Park:<BR><BR>Will be interesting to see what Ken and others have to say.
The LBC<BR>standard does exhibit moire which was one of the reasons for the
move to<BR>HBC. As far as I know, there's no way to get rid of it, but
there are<BR>several things to evaluate in order to determine if what you are
seeing is<BR>"normal". First of all, take a look at the video in EE mode
with LBC<BR>selected as your standard. The moire that you see should be
the "normal"<BR>amount that would be expected from LBC. It will be
dependent on the content<BR>of the video, and can be most easily evaluated
with a steady signal such as<BR>color bars. As a further test, you can
compare two different machines in EE<BR>as a check to be certain that there's
not a problem with the signal system<BR>since they should produce the same
results.<BR><BR>The second part of the problem relates to how the tapes that
you have were<BR>recorded. If they are first generation, they should
essentially look like<BR>the EE signal (as far as moire is concerned).
But if they are second<BR>generation or later, and if they were video dubs
from LBC masters, then the<BR>moire has been recorded into the video signal,
and it will appear along with<BR>any moire that is a product of the LBC demod,
so that the amount of moire<BR>will exceed the "normal" amount that you see in
EE.<BR><BR>Another possibility if your tapes were recorded in the mid 60's and
they are<BR>dubs, is that they could still be first generation as far as the
LBC<BR>standard is concerned. After HBC became available in '64, it was
common to<BR>have a HBC master that was then dubbed to LBC for distribution to
stations<BR>that were still largely equipped only for LBC. That practice
continued for<BR>a number of years, so you can have a tape that is a dub but
is only a single<BR>generation of
LBC.<BR><BR>Don<BR><BR><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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