[Elecraft] Share a port for KPA500

[Andy Durbin]

"I have a TS-890S that has a KPA500 connected to the  radio's serial 
port.   The amp follows the radio, no problem.  Very slick.

I also have a TS-590SG that I can use as a second receiver  for the 
TS-890.   For this to work right, the sub RX needs to connect to the 890 
via the serial port with a null modem cable and set to a 115,200 baud rate.

Is there a simple way to get the band data to the amp while the 2 radios 
are connected to  each other as described above?"

Does the TS-590SG/TS-890S absolutely have to be 115,200?   The KPA500 maximum data rate is 38,400.

If the TS-590SG/TS-890S link will work at 38,400 then it may be possible to pick off IF, FA and FB with a Y cable.  I don't know what subset of CAT commands is used when a TS-590SG is used as a second receiver so it may not be possible even if the interface does work at 38,400. 

Of course other options are available if an intermediate PC or smart controller can be used. 

73,
Andy, k3wyc