[Elecraft] k2 bnc connector

[ON4WIX]

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" <w9cf at ptolemy.la.asu.edu>
To: <elecraft at mailman.qth.net>
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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>
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