Nigel,
Set your counter to high impedance. Then install a T connector on the
input. Then you can install or remove a 50 ohm terminator on the T while
plotting the results. Then you can see how fast the frequency shift is
depending on the load.
AL, k9si
Switching the impedance at the counter itself resets any plot that's in
progress, which does introduce some delay, so I put together a small
switch
box that could be inserted into the coax and confirmed it's a rapid
effect
that's unlikely to be thermal.
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