I don't have an Omni but I do have an AL-811 that I use on 160 meters with my
Orion II. The AL-811 is not designed to be used on QSK without Ameritron's
QSK-5 switching unit, which I do not have (user reports on it have been mixed).
I simply run a control line between the AL-811 and one of the two amp keying
jacks on the Orion II. I have set the hang time on the Orion to 60%, which
seems to work fine with the 15-20 wpm CW that I generally use on 160.
BTW, I've replaced the 811As in the AL-811 with 572Bs to get better plate
dissipation. Works fine.
GL & 73,
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