[Elecraft] 50 vs 75 ohm N-connectors

[K6MR]

Not sure you have anything to do the measurement, but the center pin of a 50
ohm type n male connector should be 0.0640 inches in diameter (this is the
last part of the pin before it tapers to a blunted point).  A 75 ohm pin
will be 0.0353 inches.  It's easy to tell if you have one of each, but
unless you've seen them before it may not be obvious.  

If you can remove the center pin and have a known 50 ohm female jack, insert
the pin into the center conductor of the jack.  If it goes in easily and
seems loose, the pin is a 75 ohm.  The pin should require a small amount of
force to spread the fingers of the jack.  As was mentioned before, don't try
this with a 75 ohm jack since you will ruin the jack if you push a 50 ohm
pin into it.  No problem with a  50 ohm jack since it is too big for the
smaller 75 ohm pin.

Ken  K6MR 



-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of w2bvh
Sent: Saturday, October 14, 2006 8:28 PM
To: Elecraft at mailman.qth.net
Subject: [Elecraft] 50 vs 75 ohm N-connectors

I just picked up some fine looking heavily built male N connectors at a
hamfest. Before I mount one onto the antenna end of a cable and send it up
18 feet over my roof I'd like to make sure it's a 50 ohm "N".

Does someone know how to tell a 50 ohm from a 75 ohm "N"?

Thanks in advance for your help.

73,
Lenny W2BVH
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