[QuadList] 1" transverse scan NHK's research lab developed a Quad machine in 1958

[Ted Langdell]

The ASACA 1" Quad had two models, the last introed in 1977.

It was not the only transverse quad machine and the application that  
succeeded was a bit different.

Ampex developed a 1" transverse Quad cassette system, DCRSi, which  
writes digital info to tape.

In 1983, Ampex introduced the DCRS digital cassette recorder, offering  
compact cassette storage with the equivalent of 16 digital or 8 DDR  
instrumentation reels on one cassette. Also, Partial-response maximum- 
likelihood (PRML) data decoding technology has its first use in  
Ampex's DCRsi™ recorders. This technology is now commonly used in high  
performance computer disk drives and other high density magnetic data  
storage devices.

Here's a link to a 1996 Ampex presentation about DCRSi and an Ampex  
19mm helical cassette  digital data product that uses AST:
http://www.thic.org/pdf/Oct96/ampex.twood.pdf

On page 19, Ampex promoted the Transverse scanning transport topology  
as:
• Simple and compact tape path
• Superior performance in hostile environments
• “Azimuth” recording
• >3,000 hour head life - typical

On the next page, it advises there are other benefits. and notes a  
pilot tone servo for active tracking.

There's an airborne DCRSi recorder on ebay with quite a few pictures:
http://cgi.ebay.com/AMPEX-TRANSPORT-MDL-TAPE-MACHINE-CAT-1301746-01-1-DCRSI-/310298195589?pt=LH_DefaultDomain_0&hash=item483f36b685#ht_830wt_907


On Feb 27, 2011, at 6:33 PM, Don Norwood wrote:

> Hi Wayne:
>
> I suspect you are thinking about the ASACA machine.......
>
> <ASACA 1inch Quad.jpg>
>
> Don Norwood
> Digitrak Communications, Inc.
> www.digitrakcom.com
> ----- Original Message -----
> From: Wayne Watson
>
> This post jogged a very foggy old memory. In about 1973 or 74 at NAB  
> was there a one inch quad shown by an Asian manufacturer? My recall  
> was that it had a head that looked like a very small Ampex quad.  
> When I went by the both I was surprised to see it, however there was  
> nobody there at that time that could speak enough English to tell  
> anything about it.
> Was there ever such a recorder was it a bad dream?
>
> Wayne Watson
>
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Ted Langdell
Secretary
Skype: 	TedLangdell
e-mail:	ted at quadvideotapegroup.com

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