Here is the OM that has been offering these adapters for years, with good 
comments from those using them. Stephen would have to advise as to which 
adapter would be physically appropriate and would provide the proper amount of 
pin insertion into the KX3 2M SMA jack. Using such an adaptor, sparing the SMA 
jack from the potential high number of make/break cycles, and a 4 - 6' jumper 
coax, allowing for easy manipulation while aiming the antenna, would be the 
ideal setup. The additional insertion losses and jumper cable attenuation 
shouldn't be a consideration when fox hunting, and might be of benefit if one 
were to accidentally transmit while using this setup.

http://wa8lmf.net/miscinfo/Gulyas_SMA-to-BNC_Adapters.htm

73 de Dennis KD7CAC
Scottsdale, AZ

On Sep 2, 2014, at 5:39 AM, Don Nelson <n...@comcast.net> wrote:

> The suggested attachment to the KX3 is risky because of the stress the mass 
> presents on the SMA connector.
> 
> The same risk exists for BNC antenna attached to SMA connectors on HTs. I 
> mitigated that risk, a bit, on my HT by using an adaptor that has a male SMA 
> connector that has a flat surface that snugs up to the HT body when the 
> connector is attached to the HT. This same adaptor could be used on the KX3.
> 
> Here is an example of such a connector on ebay:
> 
> http://www.ebay.com/itm/1pce-Conversion-Adapter-BNC-female-F-to-SMA-male-M-RF-connector-for-radio-gold-/271590922716?pt=US_Radio_Comm_Coaxial_Cables_Connectors&hash=item3f3c1499dc
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