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From: rjr@mgweed.UUCP (Bob Roehrig)
Newsgroups: net.ham-radio
Subject: verticals
Message-ID: <17972@mgweed.UUCP>
Date: Mon, 17-Jun-85 16:47:02 EDT
Article-I.D.: mgweed.17972
Posted: Mon Jun 17 16:47:02 1985
Date-Received: Sun, 23-Jun-85 10:52:30 EDT
Organization: AT&T Consumer Products - Montgomery Illinois
Lines: 17


THe last Field Day that I participated in where I was responsible
for setting up the 75/160 meter station, I decided to use a vertical.
I used a center loaded pipe about 35 to 40 feet high. The antenna
was tuned slightly too low in frequency for 75 so I compensated for
that with a series cap at the base. On 160, I added additional coil
to lower the frequency. The ground system consisted of eight quarter-
wave radials on 75 meters. The system worked really great on both
bands, in fact better than expected. On 160, we worked all stations
we could hear on that band in 30 minutes (there were only about 25
stations on). By the way, the base impedance, as expected, was less
than 50 ohms so a toroidal autotransformer was used to match it to the
coax. No tuner was used on the 820 transciever. The radials were
insulated stranded wire, about 18 Ga.

Bob K9EUI