The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: Dave Holford
X-Mailer: Mozilla 4.7 [en] (Win95; I)
Subject: Re: How to check for a 50 or 75 ohm connector
Date: Sat, 21 Dec 2002 22:46:01 -0500
NNTP-Posting-Date: Sat, 21 Dec 2002 22:45:02 EST
Organization: Bell Sympatico
Chris Carlen wrote:
> George Shaw wrote:
> > I have a large box of mixed BNC connectors/tees etc.
> > Using the simplest equipment possible (multimeter?) HOW do I check if
> > the connector is for 50 Ohm or 75 Ohm coax connection. There are no
> > external markings.
> I find it very difficult to accept the suggestions that 50R vs. 75R
> connectors have different diameter pins, as that would imply that the
> "BNC" connector has different mechanical standards for different
> impedances. If this is truly the case, then I will be eager to learn
> that it is so.
Although I have never noticed any obvious difference in the dimension of
BNC connectors, other than the cable size, I have always understood that
the difference between the 50 and 75 Ohm "N" connectors was the pin size
and that attempting to interconnect them could result in damage to the
connector if attempting to insert a large pin, I forget which was which,
into a small diameter socket.
If the connectors are made to either standard I would certainly expect
them to have a code stamped on somewhere which would identify which one
they are. If they are not identified then I would doubt that they meet
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup