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« on: October 15, 2021, 1957 UTC »
I was thinking it was you that mentioned checking a balun and replacing coax, which apparently was a very good decision. I can about imagine the losses if an onboard tuner was easily loading an 80m OCF on 30m through the previous coax. ;)
Not sure what model you have, but even a basic LDG Z-100A will handle 4-800 ohms, so potentially up to 16:1.... complex impedances aside. I suspect that model or similar should handle 15m for your 80m OCF easily enough. 30m might be doable as well, though a good chunk of power might be dissipating as heat, too.