Topband: HV capacitor

[Tom Rauch]

> Regarding the need for a HV capacitor...might some copper
tubing and pvc pipe ala coaxial geometry apply?
>
> They're used on small loops where some pretty high
voltages reside.

Steve,

Two conductor coaxial capacitors always have considerably
higher ESR than multilayer capacitors. This is because they
are open long transmission lines instead of compact
reactances with multiple short current paths connected in
parallel.

This is why multilayer chip capacitors, good air variables,
and vacuum caps with multiple concentric plates have Q's
well up into the thousands. and transmission line type caps
of lower reactance values can be down well below 100.

73 Tom