Kevin,
while this may be true for a type N-connector, this is definitely not the
case for BNC connectors.
The center conductor in a BNC-type connector is exactly the same for a 50
ohm and a 75 ohm version.
The only difference is that a 50 ohm BNC has a teflon "shell" at the inside
of the outer conductor ring while the 75 ohm version does not have this
teflon shell.
It's the teflon that causes the impedance difference, *not* the inner
conductor diameter.
73
Glenn ON4WIX
----- Original Message -----
From: "w9cf" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, August 07, 2008 10:03 PM
Subject: Re: [Elecraft] k2 bnc connector
Scott,
Before changing it you should verify that your antenna coax is using a 50
ohm BNC.
The center conductor of the 75 ohm ones is smaller and will give
intermittent contact.
73 Kevin w9cf
Scott McDowell-4 wrote:
Hello
Has anyone had any trouble with the bnc antenna connector on a K2?
Mine doesn't make contact with the antenna coax all the time. I can tell
by the receiver noise when it looses contact. I think it is probably
doing
that when I am transmitting, but I have no way to tell except the swr
goes
out is sight. I have tried several of the bnc to pl239 adaptors and have
the
same problem with all of them.
Has anyone ever changed out the antenna receptical from the bnc to a
so239? This loosing contact with the antenna while I am transmitting
can't
be very good on the K2 final amps.
Any info will be appreciated.
73
Scott N5SM
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