On Mon, 18 Apr 2005 10:41:53 GMT, "Highland Ham"
wrote:

Have you tried to make capacitors from pieces of double sided fibreglass PCB
material ?

With traditional FR4/G10 materials you are only going to achieve
Q-factors of the order of 20-30 with a PCB capacitor even on HF, so
don't be upset, if the PCB material generates a lot of smoke :-) even
when exposed with only 100 W of RF power, especially if some high
impedances are involved.

Or even better the thin teflon material used for microwave
frequencies (expensive stuff).

Teflon has low losses on HF, tolerates high fields strengths and might
be quite usable material for HV RF capacitors, despite the lower
dielectric constant.

Paul OH3LWR