FWIW, a blocking capacitor rated @ 20,000 volts and enough current
to handle 2+ KW on 10 meters would be about the size of a
mayonaise jar. A good rule of thumb on RF doorknobs is to
look at the threads at each end. If they are #10 X 32 or larger,
you are in the ball park in the current dept.
(((73)))
Phil, K5PC
>
> Paul: By any chance did you pick up that cap at HamCom last weekend? I
> saw something like you describe there. I believe they were mylar
> dielectric foil jobs. If so, they probably have resonance problems and I
> would be skeptical about high current application in spite of the HV
> rating. 73, Dan, N5AR
>
> Paul and Abbi Elliott wrote:
> >
> > Bought a capacitor at a flea market that I am trying to identify in hopes
> > that it would be satisfactory for a plate blocking cap in a legal limit
> > amplifier. Put it in series with my 160m antenna lead to test it (on a
> > dead band in the middle of the day), and it didn't even get warm from a
> > couple of minutes key down); but since I can only muster about 3 amps in
> > that set-up, I don't think the test is severe enough to tell me what I want
> > to know.
> >
> > Some artist got turned loose on the name on it--has a "C" with some symbol
> > surrounding it--that all I can figure out, by context, is supposed to be a
> > "u" (doesn't look like one to me!) since the last letters are "stom".
> > Right below the name are the following:
> >
> > CMR3A14OSP
> > .000625 microfarad plus or minus 5%
> > 20,000 WVDC
> > 532036-1
> > 8720
> >
> > Physical dimensions are: 1 1/2" W x 5/8" D x 4 1/4" L. Has 1" x1/2" metal
> > strap connectors on each end. Body color is yellow, and the ends are red.
> >
> > Can someone, who either has the knowledge or catalog information, please
> > tell me whether the current carrying capacity and dielectric properties are
> > suitable for a plate blocking capacitor in a legal limit amplifier--about
> > 4000 VDC at 700 ma--from 160m thru 10m?
> >
> > Thanks for any help.
> >
> > 73
> >
> > Paul W5DM
> >
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