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Old July 22nd 06, 03:15 PM posted to rec.radio.amateur.antenna
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Default Aluminum tubing for vertical antenna

Cecil Moore wrote:
Jozef wrote:
I took scrap pieces of aluminum tubing lying around, not being particularly
careful of sizes as along they fit snugly into adjacent pieces when they
were slotted. I used hose clamps. I made it 33ft and 3 inches tall (1/4
wave on 40)... The Palstar has no problem
matching this vertical on all bands 40 through 6 meters including WARC
though 12 meters is the trickiest.


That antenna is 5/8 wavelength on ~17.5 MHz. Above 21 MHz,
most of the radiation is lost at a high elevation angle.
Such an antenna is a poor performer on 15m, 12m, 10m, and
6m. Matching doesn't mean much for a monopole appreciably
longer than 5/8 wavelength.
--
73, Cecil http://www.qsl.net/w5dxp


I have an almost identical vertical with a relay controlled loading
coil I switch in for 160 and 80M and a SGC tuner.

Works great 160 to 30M.

Marginal at 20M and goes to poor from there up.

--
Jim Pennino

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