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IDI, I don't think that isolation is your problem. Using LMR 400 for a choke could be an issue however. Before you pull a bone headed stunt and destroy the Imax, check the feed line with the choke in line connected to a good dummy load, connected to your radio, and place an in line meter at the dummy load end to determine RF through put, unless you have a dummy load with an RF meter. Record your results and compare thruput and output to a similar piece of coax, as well as the coax without the choke...if possible.

Here is my Thru Put list of feed lines I use. My dummy load has an RF meter and it may be a bit stingy on the low end of the watts scale.

[ATTACH]6450[/ATTACH]

In case the antenna is bad, I would test it in several places closer to the Earth and see if it is still seems attenuated.

[QUOTE="Marconi, post: 345089, member: 903"] IDI, I don't think that isolation is your problem. Using LMR 400 for a choke could be an issue however. Before you pull a bone headed stunt and destroy the Imax, check the feed line with the choke in line connected to a good dummy load, connected to your radio, and place an in line meter at the dummy load end to determine RF through put, unless you have a dummy load with an RF meter. Record your results and compare thruput and output to a similar piece of coax, as well as the coax without the choke...if possible. Here is my Thru Put list of feed lines I use. My dummy load has an RF meter and it may be a bit stingy on the low end of the watts scale. [ATTACH]6450.vB[/ATTACH] In case the antenna is bad, I would test it in several places closer to the Earth and see if it is still seems attenuated. [/QUOTE]

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