Topband: trap inv-l

[DAVID CUTHBERT]

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