[TowerTalk] [NCCC] Capacitors To Tune 160 Vertical

[Richard (Rick) Karlquist]

You can do fine with the usual dipped micas, in the 500V
series from Cornell-Dubilier, available at Halted, Mouser,
Digi-Key etc.  It shouldn't be necessary to parallel capacitors,
but if it will make you feel more secure, use a half dozen
in parallel, won't cost much.

Rick N6RK

Jim Brown K9YC wrote:
> Crew,
> 
> I'm thinking of following N6LF's advice on a rebuild of my 160 
> vertical by tuning it low and adding series capacitance to tune out 
> the resistance to match it to 50 ohms. Legal power will put about 
> 220VAC across 2.2 nF, at a little less than 6A. I think my greatest 
> concern is dissipation from the ESR of the cap. Once I get this 
> working, I'll probably do something similar for 80M.
> 
> My question is about what capacitors will work. I'm looking for 
> about 2.2 nF (2,200 pF), and I'll run legal power with the fairly 
> high duty cycle of a contest. I've got some 3kV and 6kV caps in the 
> 100-500 pF range, and some 400VDC caps in the 10-100 nF range. I 
> could series the LV caps or parallel the HV caps. Does anyone have 
> experience or an educated guess?   
> 
> 73,
> 
> Jim K9YC
> 
> 
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