Paul,
You don't have to do anything to share the mainRX with the subRX - the
K3 will split the receive (through the 3dB splitter) to the main antenna
for both receivers. That is good for SPLIT operation, but will not
produce diversity receive.
For diversity, you do need two antennas which are separated either by
space or by orientation ( for example, 1 horizontal and the other
vertical) or by using a separate receive only antenna. That cannot be
accomplished by a single coax to the K3 ANT1 jack.
Since you currently have the cable from the KAT3 to the subRX AUX ANT
input, you could put the RX antenna for the subRX on the non-transmit
(presumably ANT2) connector for diversity - but that is 'dangerous'
because if you accidentally select ANT2 for transmit, you will transmit
into your receive antenna - if it contains a preamp, that preamp may be
destroyed by transmitting into its output.
The safer way (in your case) is to change the K3 cable to the subRX AUX
ANT input to use the BNC jack. You can then connect the RX ANT to the
BNC jack and using BSET, tell the subRX to use the auxiliary antenna input.
The inclusion of the KAT500 does complicate the situation. If you look
at the KAT500 as providing the antenna for transmit as well as the
mainRX antenna (and also for the subRX when sharing the antenna with the
mainRX), then you will be OK, but that will not do diversity receive
since both receivers will be listening to the same antenna.
For diversity receive, select the AUX antenna input for the subRX and
connect the receive antenna to the BNC jack.
73,
Don W3FPR
On 4/3/2016 12:58 PM, paul ecker via Elecraft wrote:
Interesting thread and one that I have a question on. I have three antennas
coming in to the KAT3 and one jumper running from the KAT3 XMTR connector to my
K3 Ant1. When I installed the KRX3, I made the choice to have the main and sub
receiver share the antenna output of the KAT3. Since I had two choices at the
time it seems like the most practical and because all my antennas were routed
through the KAT500. So my question given the presence of the KAT, is there
still a practical way to switch back and forth between my present setup and
using the KRX3 for diversity receive? Hope question is not too confusing.
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