Hi
The display flashes during the transfer of the settings. There are hundreds of settings which are copied from Remote radio to Control radio, and during that time the radio cannot be used. I have no explanation to why you cannot switch off the radio.
It's difficult with CAT, as it is the same commands which flows between the Control Radio and the Remote Radio, as the CAT commands used by PC-programs, PA:s etc. And the PC programs etc. are probably written in the way that they expect correct answers to their request but in this setup there can be another answer comming in first on the way to the control radio or v.v.
In the K3-twin setup this is no problem as Elecraft wrote a new protocol for the communication between the Control and Remote radio which is totally different from the CAT protocol, Then it works as the PC-programs etc. do not recognize those commands at all.
To make the TS-590 twin solution perfect Kenwood must do some development otherwise it will never work as good as for K3-twin. So if anyone have connections inside Kenwood, try to convince them to do it.
73 de mike