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

[Ken K3IU]

Ken K3IU wrote:
> David:
>
> Oopps... what I said is true, but not what you are addressing. Sorry.
>
> There is only one AUX input physical connection on the KRX3. At 
> assembly, one must select which, if any, aux input source will be 
> used... either the non-tx KAT3 ant or the separate BNC connector. That 
> necessitates the selection of Ant=bnc or Ant=Atu . When I installed 
> the KRX3, I physically installed both the BNC connector and the KAT3 
> cables but did not connect either to the KRX3. Maybe later...
>
> 73, Ken K3IU
> ~~~~~~~~~~~~~~~~~~~~~~~~~~
> Ken K3IU wrote:
>> 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?
>>>
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