[Milsurplus] When is a Cap Not a Cap? Redux
David Stinson
arc5 at ix.netcom.com
Tue Sep 17 07:19:19 EDT 2013
Some time ago, we had a discussion about "when is 150 pFd NOT 150 pFd."
I had purchased some 100 and 150 pFd ceramics to us in a series-resonant LC
circuit
carrying about 10 watts of RF to an antenna.
I believe it was this cap:
http://www.digikey.com/product-detail/en/CK45-R3AD151K-NR/445-2715-ND/1007601
While 150 pFd silver micas from my junk box worked fine,
these brand-new ceramics disappated more than half the power
I sent through them. The whole bunch was worthless for this application.
I wanted to review that thread, but can't find it.
Are there any thoughts on why this is the case,
and how I might avoid this mistake in the future?
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