Ian said:
>There are too many unknowns
in that loop to understand what the frequency of the observed dip might
be telling us about reverse feed-through from the anode back to the
cathode.<
Which is where a network analyser (another machine that can lie like a
personnel manager!) comes in. Actually, you don't have to have a vector network
analyser - a scalar one (posh name for what we always use to call a sweeper)
will do. Or a spectrum analyser and tracking generator.
At a pinch, a signal generator and a sensitive voltmeter of some sort.
73
Peter G3RZP
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