On 11/28/19 9:58 AM, Herbert Schoenbohm wrote:
I have a C3S tribander which I seldom use except when on WARC bands. It is
useable there but not as good as I think it would be modifying it for 24
and 18Mhz. I wonder if anyone has tried that? I don't care about 10 and
15. I think by just changing the dimension, i.e making the 10-meter
elements longer for 24Mhz and the 15-meter element shorter to cover 18
Mhz, would possibly work. Is there anyone who has done this successfully?
This is an excellent use for a modeling code and an optimizer. There's
no "rule of thumb" that will get the right lengths and coupling between
the elements.
Get yourself a copy of 4nec2 or EZnec or AC6LA's tools, and have at it.
I can't speak for the latter two, but the first one lets you specify the
optimization criteria with multiple frequencies, and so forth.
I'd start by not worrying about tapered elements - it might be that with
the element spacings on the stock antenna, there's nothing that will
actually work. So you're basically just working with 9 wires - a real
simple model to enter.
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