Re: Improvised power resistor
- From: Rich Grise <rich@xxxxxxxxxxx>
- Date: Tue, 29 May 2007 16:40:53 GMT
On Tue, 29 May 2007 07:54:53 -0700, MooseFET wrote:
On May 28, 12:08 pm, Rich Grise <r...@xxxxxxxxxxx> wrote:
[....]
I once saw a construction project for an RF dummy load using a pile
of 1/2W or so carbon resistors and stiff wire. The end result was
about the size of a cantenna element, and of course the guy ran it
in oil.
The resistors were in groups that were arranged radially around the
center conductor, and there were wires along the length for the outer
conductor.
I've seen the same sort of thing except the center conductor was also
a string of resistors. The ground was a cage of soldered #14ish
wire. It looked a little like a steel tower design. I suspect that
the design of the outer was more for mechanical reasons than anything
electrical.
Actually, in the article I read - in QST or something, IIRC - the
outer shape actually was electrical - and the inner conductor also
had cones or frusta end-to-end - the cone-shaped parts are coaxial
impedance transformers. This apparently lets you use bags of surplus
resistors and tailor the physical design to what's available.
Cheers!
Rich
.
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- Re: Improvised power resistor
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