Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site nicmad.UUCP
Path: utzoo!linus!decvax!genrad!panda!talcott!harvard!uwvax!astroatc!nicmad!brown
From: brown@nicmad.UUCP
Newsgroups: net.video
Subject: Re: HQ VHS
Message-ID: <491@nicmad.UUCP>
Date: Wed, 1-Jan-86 01:21:22 EST
Article-I.D.: nicmad.491
Posted: Wed Jan  1 01:21:22 1986
Date-Received: Thu, 2-Jan-86 04:51:51 EST
References: <14200002@hplsla.UUCP> <485@nicmad.UUCP> <596@ttidcb.UUCP> <486@nicmad.UUCP> <600@ttidcb.UUCP>
Reply-To: brown@nicmad.UUCP (Mr. Video)
Organization: Nicolet Instrument Corp. Madison WI
Lines: 38

In article <600@ttidcb.UUCP> speaker@ttidcb.UUCP (Kenneth Speaker) writes:
>In article <486@nicmad.UUCP> brown@nicmad.UUCP (Mr. Video) writes:
>>In article <596@ttidcb.UUCP> speaker@ttidcb.UUCP (Kenneth Speaker) writes:
>>>In article <485@nicmad.UUCP> brown@nicmad.UUCP (Mr. Video) writes:

[all kinds of talk about scanning at SP speed (VHS) on JVC decks.]

Sorry to hear that your machine rolls the TV picture when fast scanning.
On my JVC deck fast scanning is called Shuttle Search.  The HRD-725U has
better picture when SP search is used, both forward and reverse.  This
deck uses a special technique of switching the 4 video heads so that the
strongest signal is switched through to the tv.  It has the effect of
displaying the SP then EP then other SP then other EP head.  In the EP
mode, only the EP heads are used, which causes more noise at the head
switchover points.

After reading your point about your TV rolling, a thought came to mind,
ie, does your TV have a vertical hold control?  If not, that may be where
some of the problem lies.  I have noticed on tvs that do not have the 
vertical hold, they tend to lose vertical sync when a video deck is
scanned.  A deck that I had worked fine on my TV (w/ hold) and rolled
on a Zenith tv, which doesn't have vertical hold.  Since fast scanning
does cause some change in the vertical rate, some tvs lose vertical sync.

So, picture rolling, when in fast scan mode, is normally caused by the
tv, not the video deck.  I suggest trying your deck on a friend's tv
that does have vertical hold.  As a little side note, I can set my tv's
vertical hold so that it is ok on normal picture, but will roll when
fast scan is used.  Adjusting the hold again takes care of the problem.

I am interested in reading what you find out.
-- 

              ihnp4------\
            harvard-\     \
Mr. Video      seismo!uwvax!nicmad!brown
              topaz-/     /
             decvax------/