From: Ian Walker
Subject: Re: How to check for a 50 or 75 ohm connector
Date: Mon, 23 Dec 2002 00:05:07 +0000
NNTP-Posting-Date: Mon, 23 Dec 2002 06:01:22 +0000 (UTC)
User-Agent: Turnpike/6.02-U ()
In article , DarkMatter
>On Sun, 22 Dec 2002 21:33:01 +0000, Ian Walker Gave
>>In article <3E061262.358FB4E@sympatico.ca>, Dave Holford
>>>Read, for example,
>>>Amphenol, and others, manufacture 50 and 75 Ohm constant impedance
>>>connectors. Acually Amphenol makes two types of 75 and one 50 Ohm.
>>>Although the connectors preserve the nominal impedance they all mate:
>>>"50 Ohm and 75 Ohm connectors are intermateable to ensure
>>>non-destructive mating" - they learned a lesson from the "N" design!
>>Just as an aside, I have seen the result of some ???? pushing a PL259
>>into a 75 ohm N, and they did it again after we repaired the instrument!
> Since the discussion is about a BNC connector, NOT a BNC "N"
>connector, I fail to see any relevance. At all.
My comment was intended to show that if users can not even see that a
PL259 and a 75 ohm N socket are not intended to mate then there is no
hope they will avoid mixing 50 and 75 N. Hence the importance of making
50 and 75 ohm BNC mechanically interchangeable and determining the
impedance by selection of dielectric.
There is no such thing as a 'BNC "N"' connector, what makes you think
there is, certainly not anything I typed above, perhaps this imaginary
connector of yours (or your inability to read what is typed) explains
your poor understanding of achieving different impedance BNC connectors.