Installing the antenna
18 Automatic Tuning Whip Antenna 9350 Installation Handbook
Installing an NVIS kit with a 9350 Automatic
Tuning Whip Antenna
An NVIS kit (Codan part number 15-00323) is available for
attaching to a 9350 antenna. For information on installing this
kit with the antenna see the instructions provided with the kit.
The NVIS kit is designed to improve the performance of short
to medium-range HF communications for the 9350 antenna by
increasing the high-angle radiation characteristics. Typically,
these communication distances are 20–500 km (12–310 mi).
The operating frequency range when using the NVIS kit is
1.6–12 MHz.
The vertical radiation pattern from a short vertical whip
antenna is very poor. As such, HF communications over short
distances may be difficult or non-existent from such an
antenna. The NVIS kit replaces the whip section of the 9350
antenna. The NVIS whip is longer and positioned horizontally
to improve the vertical radiation efficiency.
Figure 7: 9350 antenna with NVIS kit
top whip
section
bottom whip
section
roof gutter
clamps
angle
adaptor
tie-down
cord
1 m
direction of
propagation
of skywave
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