After having a snow/ice storm, and below zero temps about 7 weeks ago my swr didn't only rise to a 3, but acted erratic.
I removed three feet of my LMR 400, and of course replaced the pl259.
I also bought a new imax 2000 (cheap ham.)
After removing the 3' of coax and replacing the pl259 the swr was 1.1:1.
That all changed last week after anoth snow, ice storm.
Although my swr isn't the 3 it was before removing the 3' and replacing the pl259 it's now a 2.
I'm going to replace the old IMAX with the new one. Unfortunately I have yet to open the box the IMAX is boxed in.
I don't think what happened in your situation is common, but I'm hoping that isn't the issue with my 2000. The antenna was purchased a month ago (@cheap ham) I don't think they will take it back if theres a problem with it out of the box. I should've opened it upon recieval, but it's not that easy for me, and figured on opening it the day of the install. My fingers are crossed that's for sure. I'd hate to waste $139 as I believe that's what I paid for it. Damn I hope there is no issue. Now that I'm thinking about it there was an issue with my first IMAX 2000. I opened it after purchasing it 3 weeks before. Like the first one intended to remove it from its box when it's ready to be installed. The issue with my first IMAX about 3 years ago was it's whip section would not thread into the antennas second section. The local "radio shop" I purchased the antenna from didn't have another IMAX in stock (yeah right) so he couldn't swap the top section from another IMAX. He also wouldn't take it back as I already owned it for a few weeks even though i just opened the box. He saw the problem as i brought both the middle and whip section it threaded into. He saw the threads we're defective. So he had to order a new whip section for me. I waited about a week. I was livid. I never purchesed another item from him again. It's not the first time I did business with him, but was certainly the last. I sure hope there isn't any issues with the brand new one sitting in my garage unopened. I'm going to replace the old IMAX with the new one, and replace both pl-259's on my lmr 400. I hope that Rectifies my high swr problem. If not atleat I'll know what isn't causing the issue. I'm convinced the antenna was damaged by the snow, ice, and below zero temps.. Until the problem is resolved I won't be and haven't been using my station. It drives me insane looking at an swr of 2. PS. I'm just one of those people who have no luck unless it's bad.