[Milsurplus] [MRCA] 1155, now ATR dimensions

[J. Forster]

Not so surprising.

There is a piece that comes around every so often about why the Space
Shuttle is linked to Roman Charriots.

The 48 Volts behind 600 Ohms, and 90 VAC 20 Hz for ring for POTS lines
goes back to probably 1900-1920.

Standards last, thank goodness.

-John

=============


> On 7/8/2012 12:05 AM, Mike Morrow wrote:
>> The USN and USCG used the AN/ARC-1....
>> I always thought it was WECO's
>> work, a logical progression from their WE-233 (RT-19/ARC-4) in the
>> identical
>> package.  Perhaps WECO can take credit for setting the standard ATR
>> dimension
>> with the RT-18 and RT-19.
>
>
> They may have had an influence on it, but in the back of the 1942
> Sandretto book on Aeronautical Radio Engineering, there is a series of
> drawings on different size ATR packages, courtesy of Aeronautical Radio
> Incorporated (ARINC).  They generally get the credit for establishing
> the system, based on research of industry needs in the late 1930s.
> http://en.wikipedia.org/wiki/ARINC has more.  It is amazing that the
> system has lasted so long.
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