On 21 Mar 2007 at 17:10, Larry Benko wrote:
> Is there any reference someone could point me to concerning general
> ratings for doorknob type capacitors. I have several that are about
> 1.25 inches in diameter and 1 inch long with values of 270pF and 400pF
> and DC ratings of 12KV and 20KV. I assume at RF the most important
> rating would be the rated RF current which based on the dissapation
> factor of the cap. would be basically how much the capacitor would heat
> up. What would be typical RF current ratings for capacitors such as
> these be? I was planning on using a couple as extra fixed capacitance
> in a couple of L network tuners I am building. One reason to minimize
> much heating is that the capacitors hava a fairly significant negative
> temperature coefficient.
Tony, I0JX, has a good discussion of this subject at:
http://www.geocities.com/SiliconValley/Pines/5440/index.html
go down the list 6 or 7 lines, and you'll find lots about capacitors
in RF circuits.
73,
George T. Daughters, K6GT
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