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
I brought my RX antenna connections out on "RCA" phono
jacks. Mainly I did this so the interface was a drop-in for
my Yaesu and Icom rigs and the radios could easily be
swapped.
I have the TX antenna available (when in receive mode) and
both main and sub receiver inputs. This is a specialized
application however where I have external antenna switches
and might want to use multiple radios on one antenna. Or it
lends itself to using a noise canceller with the TX antenna
as a noise sample source, etc.
It's pretty easy to do this and it doesn't require cutting
anything up. It can be undone without anyone knowing it was
ever there. But again this is a special case where instant
and full antenna flexibility is a must.
73 Tom
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