Thanks Mitch for that info.
You were correct that I had the RCC usb cable also plugged in.
I removed the cable and then ran the serial port tool to remove all and re-installed.
Now the RCC virtual ports are gone, and now just 3 Microbit Virtual Ports show (com2) (com7) and (com8) but no other info regarding other assignments.(see the attached jpg screen shot of device manager.)
I start the mico client, connect to SIP and get rx good audio from the remote radio.
I then start TRX manager and have tried all ports com2, com7 and com8 but no radio control.
I do notice that only when using COM2 in TRX manager that the COM0 light in the client flashes green...sometimes steady, but TRX does not update the K3 interface at all.
I tried all of the above as a "fresh install" of the Micro client, TRX manager and the dongle on another machine (W7) and got the exact same result. No control with TRX manager.
I fear I am doing something very wrong (and probably embarrassing) here since I doubt it should be this difficult.
Steve