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Erratic SWR on 17M

AB7R
AB7R Member ✭✭
in Power Genius XL Amplifier

Working some FT8 on 17M. TGXL tunes to 1.15. With PGXL in standby and running 35W on the 8600 The SWR is nice and steady at 1.2. But if I change the amp to operate the SWR starts jumping around like crazy…up to 3.0 on peaks.

This only happens on 17M. Antenna is a DX Commander Rapide. I have lots of chokes installed but still sounds like it could be RF from Common mode currents. What do you think?

Tnx
Greg
AB7R

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