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From: Richard Kaulfuss
Subject: Re: How to check for a 50 or 75 ohm connector
Date: Mon, 23 Dec 2002 22:44:02 +0000
References: <firstname.lastname@example.org> <email@example.com> <3E077496.EDFF8BE0@sympatico.ca>
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On Mon, 23 Dec 2002 15:39:50 -0500, Dave Holford
>As to the continuing saga of the BNC. If the 50 and 75 Ohm connectors
>were indeed incompatible I wonder why I have never encountered test
>equipment with 50 or 75 Ohm restrictions? The organization for which I
>worked for almost 30 years used vast quantities of test equipment in the
>servicing and maintenance of 50 Ohm communications and 75 Ohm video
>systems and I never recall ever seeing any piece of test equipment
>restricted to communications or video systems - even in our research
>labs. Just did a quick search of a couple of oscilloscope manuals and
>can find NO warning about using the 'wrong' type of BNC plugs.
I know of at least one major test equipment manufacturer who
routinely uses 50 ohm connectors on their 75 ohm inputs/outputs.
The dielectric gives the centre pin added mechanical protection
and the mismatch is insignificant below 100MHz.
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