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Old 23rd Sep 2020, 2:52 pm   #3
G6Tanuki's Avatar
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 8,958
Default Re: A 'Modern Vintage" 3.5MHz ATU.

Good point - I don't remember the resistive component the VNA gave - should have taken a photo of the screen rather than writing-down what I thought I needed to remember using a biro on the back of my hand!

But the suck-it-and-see approach seems to work OK - no flashovers or things-getting-hot, unlike a friend who built an ATU using similar 'design' ethics and ended up with a crazily-high 'Q', so high that one end of the coil unsoldered itself due to the massive circulating RF current.
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