This is in regard to the coaxial trap inverted-L. Tom's article shows us that
traps aren't bad things to be avoided. But for those who still oppose traps, 80
meters can be added to a 160 meter inverted-L by placing a 1/4-wavelength (80
meters) grounded wire 15 cm from the inverted-L. Is anyone here using such an
antenna? This is based on a NEC simulation and on Monday I can put a 1/50 scale
model together and see if it really works as simulated.
However, the 160 meter quarter wavelength inverted-L should make a fine half
wavelength antenna on 80 meters. For installations that have effective ground
resistance above 15 ohms this will beat the 80 meter vertical. This is based on
a 50-50 inverted-L. That is, an inverted-L that runs vertically for
1/8-wavelength and then horizontal for 1/8-wavelength. It just takes switching
at the base to change bands.
Dave WX7G
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