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From: John Woodgate
Subject: Re: How to check for a 50 or 75 ohm connector
Date: Sun, 22 Dec 2002 23:15:31 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Mon, 23 Dec 2002 07:46:28 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that firstname.lastname@example.org wrote
(in ) about 'How to check for a 50
or 75 ohm connector', on Sun, 22 Dec 2002:
>There was a version of the "BNC" made by one manufacturer which had different
>size centre pins and obviously failed to meet the real BNC spec, but it has
>not been on the market for quite a few years this I suspect is where the
>rumor started (ref. a long article about this in the back of the Canford
That may well be the explanation for the disagreement. The 75 ohm
connectors that I have are over 30 years old, and they don't make
reliable contact in a 50 ohm socket.
I'm not at all sure that there WAS a 'real BNC spec' for 75 ohm parts
that long ago. AIUI, the connector was conceived and designed as a 50
ohm part and no 75 ohm version was originally contemplated.
I wonder if any German manufacturer made a 60 ohm part.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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