With a little more searching, voila!

5. QST Product Review: Jun 2005 [5.845%]
... and outputs. The CW keying, data and CAT (computeraided
transceive) cables ...
a.. http://www.arrl.org/members-only/prodrev... - 490356 bytes
[application/pdf] - Mon, 25 Apr 2005, 12:39:23 EDT

From "Radio Acronyms 4000+ (Always under construction) By Hugh Stegman ..."
http://www.ominous-valve.com/acronyms.txt:

CAT (1)Clear Air Turbulence
CAT (2)Computer Aided Transceiver, proprietary control interface

From "Telecommunication abbreviations English Russian dictionary for
Polyglossum" http://www.ets.ru/e/ei000056.htm

CAT, computer aided transceiver ?????????????????? ????????????????
~, channel activity table ??????? ?????????? ???????

See also http://en.wikipedia.org/wiki/CAT

And I just added it to http://en.wiktionary.org/wiki/CAT#.7B.7Bacronym.7D.7D

Tom

"Tom Holden" ) writes:
From "Radio Acronyms 4000+ (Always under construction) By Hugh Stegman ..."
http://www.ominous-valve.com/acronyms.txt:

CAT (1)Clear Air Turbulence
CAT (2)Computer Aided Transceiver, proprietary control interface

But since Yaesu, who seems to be the originator of "CAT", uses
it in their FRG-100 receiver, Computer Aided Tuning would indeed be
more descriptive.

And given that the original poster did not seem to be clueless and
posting an off-topic question here, clearly the "CAT" relates to
radio, and so many of the replies are irrelevant.

Michael