[Elecraft] Re: K3 KRX3 - BNC or KAT3?

[Ken K3IU]

David:
Re: your first statement/question... The MAIN/AUX selection can be made 
at any time after the KRX3 is installed and turned on by press/hold of 
BSET and tapping the ANT button. It is not just a "choose at 
installation time" option.
73, Ken K3IU
~~~~~~~~~~~~~~~~~~~~~~~
David Ferrington, M0XDF wrote:
> Wayne (and anyone else who has installed the KRX3), there are some 
> questions buried in here, marked with 2 ** to help spot them.
>
> Hmmmm, from original reading of the Owners manual and discussions on 
> here last year, I thought selection of either the KAT3 non-Tx ANT1/2 
> or the Aux BNC Jack (AUX.RF) would be via software.
>
> ** I assume that this has proven to be a problem and so now it's a 
> 'choose at installation time' option (as per KRX3 installation manual)?
>
> Even now, reading the Owners Manual, the diagrams on pg 41 and 42 (of 
> rev D1) suggest the AUX.RF is connected to SA4, along with the KAT3 
> connection.
>
> ** Should the horizontal line from SA4 to KAT3 be dotted as well, with 
> a note saying installation option (choose one of two)?
>
>
> I wish to use 2 antennas and may transmit on either and I had planned 
> to be able to listen on both and then transmit on one of them. So for 
> me, using the KAT3 method appears to be best. Issue with COR and delay 
> etc. won't come into it (I think).
>
> However, the work to install the AUX.RF connector is 'significant' 
> (well, ok, it’s a bit more, involving removing side panels etc.) so 
> I'd like to do this while I'm installing the KRX3, just so it's done.
>
> But then, not connect the TMP lead to the KRX3, but sleeve the 
> connector and 'tuck' it out of the way somewhere.
>
> ** Is it possible/acceptable to install the AUX.RF BNC jack, but not 
> connect it to anything?
> ** Would there be any implications of stray RF on the lead to worry 
> about?
>
> And, if at some point in the future, I choose to use AUX.RF, switch 
> the lead to the KAT3 with the AUX.RF lead, again sleeving the KAT3 TMP 
> to avoid any shorts.
>
> ** Again, is there any issue with leaving the KAT3 lead connected to 
> the KAT3, but not connected to the KRX3?
>
> ** Perhaps it would be advisable to install an additional TMP socket 
> with both pin and shield grounded and to connect the unused TMP lead 
> to it?
>
> ** Might that be a future mod for you, providing an unused TMP socket 
> just to terminate the unused lead?
>