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

[W4wj at aol.com]

Chris...
 
Regarding NSA, I suggest you check out "Body of  Secrets"...  A great 
technical read that covers the question that you just  brought up!
 
 
73, Don, W4WJ
Army Security Agency '64 - '68
 
Retired from 40 years of Miami TV Engineering
35+ years at NBC O&O WTVJ
 
 
 
 
 
In a message dated 2/28/2011 6:10:51 A.M. Central Standard Time,  
Chill315 at aol.com writes:

Very interesting product.  The thing is now you can buy a terabyte  for 
about $50.  So that would replace the capacity of three of the  cassettes.  
 
Was this product used for archival or as an on-line storage unit.   The 
presentation talks about the airborne product line and the fixed product  line. 
 Sounds like a military product.
 
Now here is an interesting question, How does NSA or the CIA or other  
agency archive all the data that they have?  
 
Chris Hill
WA8IGN
 
 
In a message dated 2/28/2011 3:10:40 A.M. Eastern Standard Time,  
ted at quadvideotapegroup.com writes:

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_ 
(http://www.digparty.com/w/index.php?title=Partial-response_maximum-likelihood&
action=edit&redlink=1)  (_PRML_ (http://www.digparty.com/wiki/PRML) ) data 
decoding technology  has its first use in Ampex's _DCRsi_ 
(http://www.digparty.com/w/index.php?title=DCRsi&action=edit&redlink=1) ™  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_ 
(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_ 
(http://cgi.ebay.com/AMPEX-TRANSPORT-MDL-TAPE-MACHINE-CAT-1301746-01-1-DCRSI-/310
298195589?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_ (http://www.digitrakcom.com/) 

----- Original Message -----
From: _Wayne Watson_ (mailto:wayne.watson at sait.ca) 


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_ (mailto:ted at quadvideotapegroup.com) 





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