> Is there any reference someone could point me to
> concerning general
> ratings for doorknob type capacitors. I have several that
> are about
HEC or High Energy Corporation has a web site with data on
it. They assume all production of ITT Jennings doorknobs and
have manufacturerd their own for several years.
> 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?
When you look at current ratings look closely. Everyone just
loves a simple answer, but simple answers are often wrong!
There is an allowable current based on several other
factors, including voltage rating and frequency. If your
application allows more drift, has cooling airflow, has a
dissipative mounting like a large cool chassis, and other
things that allow better heat dissipation you can run MORE
than rated current. It is also possible you would have to
run less than "rated" current.
In general the best approach is to try the capacitor and see
how it works. If it stays within temperature limits or
within limits of the drift you can tolerate it is almost
certainly OK regardless of current.
73 Tom
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