[Elecraft] KRC2 and KX3

[Marcus Busch [DL1EKC]]

Hi folks,

I'm trying to interconnect my KX3 and KRC2. I read the posts on this topic dating 
back to early March. The KRC2 is a very versatile unit allowing parallel operation of 
band filters via the BCD outputs and antenna relays the same time. So I would really 
like to get the KRC2 running with my KX3.

I have the basic KX3 interoperating with the KRC2, but I had to bridge D9 on the 
KRC2. Without this bridge serial comms via the KRC2 doesn't work here. Also the KRC2 
utility does not find my KRC2 with 19200 bd but with slower speeds.

I have jumpers W9, W10, W22, W23, W3 and W8 in, all others out.

These are my configurations:

1) KX3 with KRC2

KRC2 and KX3 set to 19200 bd -> works

2) KX3 + PX3 with KRC2

KRC2 is set to 19200 bd, PX3 to 19200 bd and KX3 to 38400 bd -> works

Comment: It seems the PX3 is relaying the rs232 comms to the KX3 with 38400 bd, which 
is indepentend from the PX3<->PC line speed. However, with the PX3 switched off but 
still connected in-line the KX3 RS232 speed has to be set to 19200 bd (passive 
pass-through). It took me quite some time to figure this out :-) .

3) KX3 + PX3 + KXPA100 with KRC2

KRC2 is set to 19200 bd, PX3 to 19200 bd and KX3 to 38400 bd. The RS232 connection 
chain is PC - KRC2 - KXPA100 - PX3 - KX3.

KRC2 operation works, but I cannot operate the KXPA100. Upon setting pa mode to on 
the KXPA100 switches on. But after a few seconds the KX3 menu entry switches back to 
off, after a few more seconds the KXPA100 switches off.

Note 1: When I disconnect the KRC2 from KXPA100 AND set the line speed in PX3 to 
38400 bd, KXPA100 operation works.

Note 2: If I leave the PX3 line rate at 19200 bd, serial comms from PC to KX3 is 
disrupted as long as the KXPA100 is on.

I know all this is a bit confusing and I have no clue how to solve this. Anyone here 
can give an advice?

Thanks for Your time.

VY 73

Marcus, DL1EKC