[Elecraft] KE: issue with installation of K3EXREF interface

[Ron D'Eau Claire]

FB Don. Since you were responding to a threat specifically about the K3EXREF
SMA I didn't want anyone to think that your comments applied in that case. 

I, too, usually put a male connector on a female panel mount BNC to hold it
while I tighten the inside nut. The SMA in question doesn't work like that. 

Why those connectors failed is a mystery. I forwarded the info to support so
the engineers can do a little head scratching over it, Hi! 

73 Ron AC7AC

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don
Wilhelm
Sent: Saturday, April 2, 2016 4:51 PM
To: Ron D'Eau Claire; 'Mike Cox'; elecraft at mailman.qth.net
Subject: Re: [Elecraft] KE: issue with installation of K3EXREF interface

Ron,

OK on the SMA connectors.  I have seen several types.  Some are similar the
the BNC chassis mount while others have a "nut" on the outside that one can
grasp with a wrench (and makes my suggestion of screwing on a mating
connector a moot point).

I do believe my points about using a male connector to provide something for
pliers to grasp as well as the star lockwasher placement are valid points
for the chassis mount BNC as well as for *some* SMA connector applications.

I did not check the exact SMA connector for the K3/S EXT REF SMA connector
before responding, and it has been a while since I have installed one.
My comments were general and apply only to those BNC and SMA connectors that
fasten directly to the chassis.

73,
Don W3FPR

On 4/2/2016 7:33 PM, Ron D'Eau Claire wrote:
> Don, in this case the lock washer would jam into the opening for the 
> connector. If you look at the setup in the manual you'll see that 
> panel hole is oversized and the engineers put an o-ring on the 
> connector that centers it in the hole. The inside surface of the panel 
> is masked to provide good contact with a large flat washer that goes 
> against the rear panel opening and provides a good surface for the nut 
> and lock washer that secures the connector to bear against.
>
> The connector has a hex cut on the inside ferrule. Tightening is done 
> with a wrench or pliers on the nut outside while holding the hex cut 
> ferrule on the inside to keep it from turning.
>
> 73, Ron AC7AC
>
>

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