[Lowfer] Interesting finding

[Bill Ashlock]

Ed,

>A Q of 8000 with a LOSSLESS loop would still mean a dissipation factor
>of 0.000125 for the capacitor, or less than the dissipation factor I can
>find listed for any mica type.

Right. I may be simply trying to violate the properties of the material.

>A good EXTENDED FOIL polystyrene
>capacitor (or group in parallel to reduce the effects of lead
>resistance) is probably your best bet but still can't make it.

I could only find one polystyrene, last night, in the range I need, a 900pf. 
The Q was better than the group of 4 paralleled micas but not as good as the 
group of 3 tiny COG ceramics. I have a whole box of polystyrenes here at 
work but they, so far, elude me.

>In principle an air-dielectric capacitor might, but it would be enormous.

Is glass-epoxie any good? (as in double sided pc board stock)

Thanks!

Bill

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