Thomas & Karen Mitchell kg7uATolympus.net wrote in
:

(I realize that a through-the-glass antenna is less than ideal.
Nevertheless, that's what I have to use in my situation.) The one I
have is for 2 meters (NOT dual band), and the label says up to 50
watts. I have an Icom IC-2200H, which has a maximum of 65 watts
output.

What bad things may/could/will happen if I put 65 watts through the
antenna?

If your transceiver really does make 65W into a 50 ohm load, and you
connected say 4m of RG58C/U to a 50 ohm load, line losses are such that
only 54W reaches the load. So you might not be quite feeding the antenna
with 65W, the likely amount depends on your feedline type and length.

Your antenna is probably not exactly 50 ohms, and there could be higher
current or higher voltage at the coupler than for a true 50 ohm load...
but the designers should have included a safety margin to cover this
factor. (The on-glass coupler is the achilles heel of these things, you
will feel them warm up with a bit of use.)

If the antenna is rated for 50W, and can't reliably stand 60W, it is a
bit marginally rated, but on-glass mounts are a bit that way.

Owen