[QuadList] RCA Models

[Don Norwood]

Hi Ted:

I would expect it to look like playing a 7.5 ips recording with a 10-mil head.  Yes, it does lock, but the result is not good due to the cross tracking.

Don
  ----- Original Message ----- 
  From: Ted Langdell 
  To: Don Norwood ; Quad List 
  Sent: Friday, February 25, 2011 6:34 PM
  Subject: Re: [QuadList] RCA Models


  I was scratching my head about this, too. 


  Would the adjustment of the playback machine's tracking head allow you to center on just ONE of the 5-mil tracks enough that the FM discriminator would lock onto the stronger signal, much like an FM receiver does when faced with two co-channel stations?


  Ted


  On Feb 25, 2011, at 3:19 PM, Don Norwood wrote:


    I must be missing something.  The purpose of the octaplex system was to record two different video signals simultaneously.  The tracks are 5-mil with a 45 degree displacment on the drum between channels.  So a 10 mil head would certainly cross-track them, but in addition to the tracking errors, you would have 2 different signals "on top" of each other.  I'm still not understanding how you recovered that, or what the purpose was if the octaplex was recording the same thing on both tracks.

    Don Norwood
    Digitrak Communications, Inc.
    www.digitrakcom.com


    ----- Original Message ----- From: <bill.spencer at northstarstudios.tv>
    To: <dwnorwood at embarqmail.com>; <quadlist at quadvideotapegroup.com>
    Sent: Friday, February 25, 2011 4:43 PM
    Subject: RE: [QuadList] RCA Models


    No, every other head pass was displaced by a few microseconds and there
    were twice as many, but within the 10 mil head it picked up all and the
    TBC lined them all up.  The machine was one owned by the production
    people at National Life/Opryland/Gaylord/TNN/CBS Cable/MTV Networks, but
    I don't know what the disposition of it was during all the acquisitions.
    There are some old-timers still in town that might know what happened to
    it.

    I remember that Sony tried something similar in early Betacam where the
    camcorder had a drum half the size and recorded a track in two
    revolutions, actually I think all the camcorders worked that way after
    the BVV-5.

    Bill Spencer
    NorthStar Studios, Inc.
    3201 Dickerson Pike
    Nashville, TN 37207
    (615) 650-6610
    CP (615) 445-5616

    -----Original Message-----
    From: quadlist-bounces at quadvideotapegroup.com
    [mailto:quadlist-bounces at quadvideotapegroup.com] On Behalf Of Don
    Norwood
    Sent: Friday, February 25, 2011 3:06 PM
    To: Quad List
    Subject: Re: [QuadList] RCA Models

    Hi Bill......

    So are you saying that you used a 5-mil head and recovered two different

    programs from the tape?

    Don

    ----- Original Message ----- From: <bill.spencer at northstarstudios.tv>
    To: <quadlist at quadvideotapegroup.com>
    Sent: Friday, February 25, 2011 11:37 AM
    Subject: Re: [QuadList] RCA Models


    I have dubbed some tapes from a 10 and the head was definitely an
    octoplex
    as there was differential timing from one set of heads to the other.
    The
    good news is that the digital TBC in the AVR-2 was able to correct it
    and a
    previously thought 'lost' piece of material is now safe on a new digital

    format.

    Bill Spencer
    RF Engineering Supervisor
    (615) 650-6610
    (615) 445-5616 CP

    ________________________________

    From: quadlist-bounces at quadvideotapegroup.com on behalf of
    Chill315 at aol.com
    Sent: Fri 2/25/2011 9:19 AM
    To: quadlist at quadvideotapegroup.com
    Subject: Re: [QuadList] RCA Models


    David

    I have seen the portable one displayed.  It was a military unit that was

    sold to the public.  I was told somewhere that the original military one
    was
    a Octo-plex unit.  I have vague memories of someone previous mentioning
    the
    model and working with it.  So we have to assume that it was sold.

    Any way this has been an interesting discussion.

    Chris Hill






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  Ted Langdell
  Secretary
  Skype:  TedLangdell
  e-mail: ted at quadvideotapegroup.com

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