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From: daryl@tcomeng.uucp (Daryl Jones)
Newsgroups: comp.dcom.telecom
Subject: The Origin of Coax Connector Names: BNC & TNC
Message-ID: <1767@accuvax.nwu.edu>
Date: 3 Dec 89 04:07:42 GMT
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X-Telecom-Digest: Volume 9, Issue 548, message 8 of 8


The following message was posted to my BBS a few days ago. I thought
the net would be interested...
 
  >Fm: PHIL RANE (Compuserve 74075,1244)
  >To: all 
 
Some time ago we had a lengthy discussion about the origins of the
coax connector names such as BNC, TNC, etc. I have just come across an
article in QST, a Ham magazine that I think is the real McCoy. I would
like to share it with you. 

Quoting: During WWII, the requirements for connectors better than the
UHF PL-259 and SO-239 ones, to be used for radar use, prompted two
designs.  The first was developed at Bell Labs by Paul Neill and
identified as the type N connector. At the same time, another
connector was devised by Carl Concelman.  

Named the type C connector, it was the first designed as a true 50-ohm
connector.  Later, Neill and Concelman collaborated on the design of a
minature bayonet locking connector. This was dubbed the Bayonet
Neill-Concelman, or BNC connector. Some time after that, an improved,
threaded version for airborne use was developed and called the
Threaded Neill-Concelman or TNC connector. 

For precise microwave use, a series of subminature connectors was
produced- A, B, and C. Of these three, the A, or subminature (SMA) is
the most popular. QED!
 
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