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Old 04-30-2011, 04:15 PM
xodeuce xodeuce is offline
Join Date: Jan 2011
Location: Alabama
Posts: 100

Originally Posted by CardinalFJ60 View Post
good to know. I'll figure something else out for a small antenna, someday. and bring it with me. I'm 11' tall with the antenna on the roof.

is swr of 3.0-3.2 too high to use on a trail run even with limited use?
Eh, If it were me I wouldn't run it at 3.0-3.2. You will probably do some damage to the finals in the radio. I'm not sure how much it takes to cook the finals, but I wouldn't be in a hurry to find out

For academic purposes, assuming 50w output, at 3.2 vswr:
You'll lose 27.4% of your transmit power, and 10.7w will be reflected back to the finals in the radio.

FWIW, if you're running an NMO mount, I'd recommend the Larsen stuff. The whips are stainless, and are replaceable without replacing the coil. If you run it into something, you can just swap the whip. They make several different ones. The 5/8λ you do have to cut to tune, but if you know someone with an SWR meter, or better yet an antenna analyzer, then you're good to go. I'm not sure how tall I am over all with the 5/8λ, but it's up there pretty high. I've run it into all sorts of things and it's still working like a champ.
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