[Elecraft] [KAT500]schematic

[Phil & Debbie Salas]

“...I have noticed that the port-to-port isolation between the 3 antenna ports is rather poor...”

I measured about 42dB isolation on 6M from port 1-2.  And this stays pretty constant down to 15M and then gets better fast.
I measured about 61dB isolation on 6M from port 1-3.  This gets better very fast, going to 75dB on 10M.

I use ports 1 and 3 for my two HF antennas (43ft vertical and 20/15/10M rotatable dipole), and put my 6M beam on port 2.

Phil – AD5X