[QuadList] RCA Models

[Ted Langdell]

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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