> Making capacitors out of coax seems like an easy solution, however
> they end up being fairly lossy due to copper loss. Think about
> it: you would not deliberately make a capacitor long and skinny.
One way around this is to use multiple shorter sections in parallel.
One can also use series/parallel arrangements of fixed "doorknob"
capacitors to obtain the necessary voltage/current rating to pad a
lower capacity/wider spaced "breadslicer".
73,
... Joe, W4TV
On 1/24/2013 8:39 PM, Rick Karlquist wrote:
Pete Smith N4ZR wrote:
One of the reasons I have mot gone to high power on 160 is the cost of
capacitors for my omega match - at least $300. Anyone know of any
workable alternative? I remember someone writing about using coiled-up
RG-8, RG-213 or maybe Teflon coax. Where can I find more information?
Making capacitors out of coax seems like an easy solution, however
they end up being fairly lossy due to copper loss. Think about
it: you would not deliberately make a capacitor long and skinny.
The only thing that makes them workable at all is that the heat
generated is spread out over a large area. You would have to
carefully evaluate your proposed design to see if it were feasible.
Rick N6RK
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Topband Reflector
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