BUDDIPOLE IN THE FIELD

Standard
Buddipole
with coil
Optional
RAK
9.5' whips
+2 arms
Vertical element
5.5' whip: 6 sections (all out)
Two antenna accessory arm
Red coil: tap 2
Radials
See above
The radiator and radials for the 12m band are almost exactly the size of a
9.5' whip so these longer pieces are ideal for this configuration.
SWR with sloping radials
SWR with horiz. whip radials
84
Figure 34 SWR plots for 12m vertical
The radial system has a significant impact on the impedance presented
by the antenna. Radials that slope down away from the antenna raise the
feedpoint impedance to something close to 50 ohms, close enough to
that value that a TRSB should be set to the ratio 1:1. Conversely, the
horizontal radials not only present a lower feedpoint impedance
(something close to 20 ohms), but they must be much longer to obtain a
good match. This extra length is achieved by the addition of an antenna
accessory arm on each side between the 9.5' whip and the VersaTee. The
TRSB should be set to the ratio 2:1 (matching the roughly 25 ohms to 50
ohms) for horizontal radials.
The third option for radials (sloping whips) requires the RAK. See the
description for the 10m antenna for additional details for deploying
sloping radial whips.