On 10/15/2018 10:43 AM, Tree wrote:

I replaced the variable cap with a home made cap using RG8.  I had one

Sometimes, capacitors made from coax are lossy.  I modeled your
coaxial capacitor using Simsmith (very easy to do) and the Q turns out to be 340, if I did it correctly. So the coaxial capacitor gets a clean
bill of health and probably doesn't have anything to do with
your broad bandwidth.

Rick N6RK
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