[Elecraft] K3 Two radios on different bands using ANT1 and ANT2

[Jaroslav Chmelík]

I encountered a problem when I tried to use the K3 with Main/Sub receivers on two different bands.

Configuration:
- K3 with installed second receiver
- Second receiver connected to KAT3 (KRX3 ANT=ATU)
- Set independent VFOs (VFO IND=YES)
- SW versions: MCU 3.14, FPF: 1.00, DSPs: 2.16

Operational condition:
- SUB ON with Linked VFOs (but it behaves equally when independent)
- Main radio (VFO-A) on 20m band and switched to ANT1 connector of KAT3
- SUB radio (VFO-B) on 40m band and switched to ANT2 connector of KAT3
- I am searching two bands in parallel using bigger (A) tuning knob

When I find a station on Main radio (VFO-A 20m band), I can call it immediately without any problem. 
But when there is a station on SUB radio (VFO-B 40m band), then I hit A/B button, which swaps bands. Now, 40m band is on VFO-A so theoretically I could call the station (transmit). But, to my surprise it doesn't swap respective antenna connectors. So, with inappropriate antenna it has high SWR and I can’t transmit. Naturally, a listening is nearly impossible with inappropriate antennas.

It seems that although K3 remembers antenna connector settings for each band (and even ATU settings within bands), this doesn't apply when swapping MAIN/SUB receivers. 

Yes, there is a seemingly easy solution: At first hit the A/B button (swaps bands), and then ANT button (swaps antennas). But this isn't very handy. One has to switch both buttons back, when QSO is finished, and it represents several wasted seconds, that can be very valuable during contest. (these buttons are on the opposite sides of the front panel)
I think it would be fine, especially during S&P operation in QRP categories in contests, if K3 (without any additional hardware) could be used in such a semi (or pseudo?) SO2R set-up. 

Is there anything that can solve this problem? Maybe, I am missing something in the CONFIG MENU. Or, is there any technical (hardware) reason, which excludes that?

Jarda OK1HDU