// The maximum AC potential across a blocking capacitor is typically
less than a hundred volts at the lowest operating freq. The maximum DC
potential across one is the no-load anode supply voltage. The critical
rating is the RF ampere rating at the highest operating frequency. I see
no reason for the ARRL's statement. QST no longer has a Technical
Editor.
In the 1999 ARRL Handbook (et al) on page 13.13, a formula is given
as a "very rough rule of thumb" for figuring maximum RF current in a
blocking capacitor @ 28 mhz. I "plugged in" 35pf anode C, 1 amp Ip,
and 4 kv anode E. The result was 350 amps! (a bit high, me thinks!)
Perhaps my ignorance of the "new math" caused an error????
(((73)))
Phil, K5PC
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|