Recently someone posted a request for help on analyzing this famous plate
choke for possible resonances, but I can't find the original post (I don't
keep old mail for long). This morning, I found one of these things hiding in
a box of parts that had slipped below the radar. I pulled it out and did a
quick sweep with the Vector Z meter, so if whoever that was will contact me,
I can email you all of the resonance data.
They made both an R-175 and an R-175A - I don't know which we have, but it is
pristine so whatever you have, you can compare it with my physical
measurments to verify.
73
Eric K8LV
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