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W9, I would not recommend the 811\811H to be used on 27 Mhz.

They are not designed to run on 11  meters.

It is my experience that power output is low on 27 MHz and one of the reasons is in the screen shot below from W8JI.

Most guys running AM are not going to be happy with the result of these two amps.

[ATTACH=full]45524[/ATTACH]

73

Jeff