[TowerTalk] Multiple Rigs switch isolation .

[johne tds.net]

I just checked a multiple rig switch port that would connect on to the
other  HF radio and with the other HF rig keyed up  (500w cw) I did measure
500 ma on the  section of coax that would go to the other rig. I am worried
about the isolation of the two HF rig's. Any better way to check this ? or
is the 500ma ok ? The switch is a ice 512-12 antenna switch.
one antenna , two HF rigs.
Thanks de John K0CQW