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Hiroki,

I plan to be at there. Can you bring one of your 1N4756 Zener diodes. I checked the data sheet, and it has about 30 to 80pf when it is reverse biased. I looked at the bandpass filters on the output, most of the lower bands have capacitor values well above 50pf. It may have some impact on 10M which has an input cap close to 50pf.

Thanks, Dave W6VYC