[QuadList] WRC B/W to Color Quad tape

[Chill315 at aol.com]

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.
 
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.
 
Chris Hill
WA8IGN
 
 
In a message dated 1/19/2014 11:19:49 P.M. Eastern Standard Time,  
dwnorwood at embarqmail.com writes:


----- Original Message ----- 
From: "Charles Park  Seward"
>
> I have a question about the early color recordings. I  have some low band 
> color recordings from the middle 60s and I see a  lot of herringbone 
> interference. Is that because of the frequencies  they used? Is there a 
way 
> to clean that up?

Hi  Park:

Will be interesting to see what Ken and others have to say.   The LBC
standard does exhibit moire which was one of the reasons for the  move to
HBC.  As far as I know, there's no way to get rid of it, but  there are
several things to evaluate in order to determine if what you are  seeing is
"normal".  First of all, take a look at the video in EE mode  with LBC
selected as your standard.  The moire that you see should be  the "normal"
amount that would be expected from LBC.  It will be  dependent on the 
content
of the video, and can be most easily evaluated  with a steady signal such as
color bars.  As a further test, you can  compare two different machines in 
EE
as a check to be certain that there's  not a problem with the signal system
since they should produce the same  results.

The second part of the problem relates to how the tapes that  you have were
recorded.  If they are first generation, they should  essentially look like
the EE signal (as far as moire is concerned).   But if they are second
generation or later, and if they were video dubs  from LBC masters, then the
moire has been recorded into the video signal,  and it will appear along 
with
any moire that is a product of the LBC demod,  so that the amount of moire
will exceed the "normal" amount that you see in  EE.

Another possibility if your tapes were recorded in the mid 60's and  they 
are
dubs, is that they could still be first generation as far as the  LBC
standard is concerned.  After HBC became available in '64, it was  common to
have a HBC master that was then dubbed to LBC for distribution to  stations
that were still largely equipped only for LBC.  That practice  continued for
a number of years, so you can have a tape that is a dub but  is only a 
single
generation of  LBC.

Don



______________________________________________
Please  trim posts to relevant info when replying.

Change subject to reflect  thread direction.  Thanks.
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