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Harmonics and oscillation certainly can. I just dont think those problems should be ignored. Bad connections or other antenna issues can cause similar symptoms that change with power levels.

I have a friend that refuses to solder the shield on a pl259 or weatherproof it. He just rolls the braid back and screws it on.
Every year he ends up with high swr when barefoot. When he turns the amp on the voltage is high enough to overcome the high resistance (corrosion) between the shield and pl259 and the swr comes down. He's also been know to have soft tubes but that's another story.

[QUOTE="543_Dallas, post: 673450, member: 21044"] Harmonics and oscillation certainly can. I just dont think those problems should be ignored. Bad connections or other antenna issues can cause similar symptoms that change with power levels. I have a friend that refuses to solder the shield on a pl259 or weatherproof it. He just rolls the braid back and screws it on. Every year he ends up with high swr when barefoot. When he turns the amp on the voltage is high enough to overcome the high resistance (corrosion) between the shield and pl259 and the swr comes down. He's also been know to have soft tubes but that's another story. [/QUOTE]

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