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.
Subject: Re: How to check for a 50 or 75 ohm connector
Summary: What do you think of these ping times eh?
Reply-To: You can't see me, and I pass right through planets...
X-Newsreader: Forte Agent 1.91/32.564
Date: Sun, 22 Dec 2002 11:17:24 GMT
NNTP-Posting-Date: Sun, 22 Dec 2002 06:17:24 EST
On Sat, 21 Dec 2002 22:46:01 -0500, Dave Holford
>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
ALL BNC connectors are the same shape on the connector side. ALL
"f" type connectors are the same shape on the connector side. ALL
"RCA" type connectors are the same shape on the connector side.
Starting to make sense yet?
Since one can have both 75 and 50 ohm versions of each cable type
yet still retain the moniker for the connector, the cable end of the
connectors mentioned are the only things about them that change as
said cables change. The connector side is standardized, however.
The world would be a huge mess otherwise. I think they call them
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup