On Thu, 29 Nov 2007 12:15:26 -0700, David Gilbert wrote:
>I'd probably shoot for more margin on the parallel portion than on
>the series portion
Thanks for the many excellent thoughts on this issue. Based on the
contents of my junkbox, I began with two .0047 400V dipped micas in
series, and pumped 1 kW through them for a few minutes. They got
warm, as one would suspect, but no sign of overheating.
Returning to the junkbox, I found enough of them to build two
parallel legs of four series .0047's. I'll smoke test that for a
while before ARRL 160 this weekend. In the meantime, I'll also put
together a parallel combo and have that waiting if and when the
smoke starts. :)
Luckily, the feedpoint of this vertical is at ground level and only
30 ft of coax from the shack. I've been tuning it with a TenTec
229B, and that works. And it's easy to transmit for a while, then
run outside to see how hot the caps are getting.
73,
Jim Brown K9YC
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