20 Meter "Vertical
Zepp Dipole" Antenna
The coaxial cable is fed down or up, your choice, through thetubing and is connected to two bolts at the bottom on the PVC section. One connection is for the coax center conductor and the other is for the coax shield. The center conductor of the antenna coax is connected to the coaxial cable center conductor that goes to the antenna tuner. The shield is connected to the coaxial cable shield. Now that was simple! Are you done yet?
Drawing above is a
suggested method of using a car wheel and tire as a support base..use your
own imagination for the base support. The overall height of the antenna
plus support will be about 17 feet plus or minus the width of the tire.
The tire not only acts as a heavy base support but also as an
additional insulator from the ground. If you leave it up permanently, you
may want to guy it in three directions with rope, cord, etc if you are
subject to winds. Non-conductive of course. Also, you may want to seal the
coax end and the connections on the PVC from Mother Nature.
I answered him and he
gave a RST of 599. I heard him 599 also. I heard 4 other Japanese stations but did not answer because
they were in a
contest. They ranged from RST 579 to 599.
Experimentation on other bands:
N4UJW at hamuniverse.com (Sorry no current email address for N7AGK)
Updates from other builders:
Subject: 20 meter antenna
Just wanted to let you know about the success I have had with an antenna project from your web site; 20 Meter "Vertical Zepp Dipole" Antenna by Carl H. Dahlberg N7AGK.
I built it using 3/4 inch copper pipe with rg-8 running up the center. I'm operating a FT-897D at 100 watts thru a MFJ tuner on 20 and 17 meters. The antenna tunes well on both bands and I have worked many stations in North & South America and Europe. Nothing heard from Asia or the Pacific... yet. Total cost from Home Depot was $28 (2010 prices).
No ground, no radials, WOW. Thanks!
John Paul St. Peter, KD8JSP (email address at QRZ.COM lookup)