[AMPS] Another Stupid Question

Tom Rauch W8JI@contesting.com
Fri, 30 Nov 2001 20:50:50 -0500

> Check the math -- 1% is 20 watts on a 2 KW amp -- a real doorknob cap
> would be fine.  However, as Mr. Measures pointed out, current at 30
> MHz can be considerable, and I^2R effects will push losses up.

Check the size of the component, and the thermal conductivity.

20 watts of dissipation in the dielectric of a conventional 850 or 858 
series doorknob would be a disaster. The part would never handle it.

You'd be amazed at how little power a physically small component 
that isn't designed with high te hemal conductivity to a heatsink of 
some form can dissipate before failing.

Efficiency is the least worry with a blocking cap.

73, Tom W8JI

FAQ on WWW:               http://www.contesting.com/FAQ/amps
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com