I had something similar happen, and it was the capacitor in the EFHW
heating up on 12 and 10 meters. It didn't heat up on any other bands.
On 7/17/22 11:38, Andy Durbin wrote:
Don't need to have ferrite in the antenna system to see this sort of SWR
"runaway". I have the same problem with my home brew small transmitting loop
if I run over 100 W.
Spent some time trying to figure out what was heating and causing the loop's
resonant frequency to shift. My preliminary analysis showed expected
temperature coefficient was opposite sign to that observed. Decided the only
way to really understand the problem was thermal imaging but have not got round
to that yet.
Andy, k3wyc
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