CHA MPAS
Page 8
counterpoise. An antenna tuner or coupler is required on most frequencies. Use the following procedure to install
the Manpack Vertical configuration.
Figure 1. Manpack Vertical.
Site Selection and Preparation
1.
Select a site to deploy the CHA MPAS Manpack
Vertical configuration. Best ground wave
communication occurs when the radio set is
located in a clear area and the whip antenna is
vertical.
Refer to plates (2) and (3) for steps (2) through (6).
2.
If attached, remove the Antenna Shackle (j)
from the Hybrid Micro Base (a) by loosening the
nut on the Antenna Shackle and then
unscrewing the Antenna Shackle from the
Antenna Connector (h). Store in secure place.
Connect the Hybrid Micro Base.
3.
Attach a counterpoise wire to the Hybrid Micro
Base by placing the counterpoise wire terminal
lug over the Counterpoise Connection (i) and
tightening the nut
(not supplied)
until snug.
4.
Connect a CHA RFI CHOKE and coaxial cable or
the Integrated RF Choke end of the CHA Coaxial
Cable assembly to the UHF Socket (g) on the
Hybrid Micro Base.
Raise the Antenna.
5.
Extend the CHA MIL WHIP by unfolding the
sections of the whip, starting with the section
above the bottom section, and ensure each
section is fully seated onto section below until
the whip is fully extended.
6.
Connect the CHA MIL WHIP to the Hybrid Micro
Base by carefully screwing the 3/8” base stud
into the Antenna Connection (h) until finger
tight.
Extend the Counterpoise
7.
Extend the counterpoise wire along the ground
in any convenient direction. You can use the
supplied
Antenna
Wire
(b),
optional
Counterpoise Kit, or any wire at least 25 feet in
length.
8.
Perform operational test.
Portable Vertical
The CHA MPAS with the optional CHA MIL EXT comprise the Portable Vertical configuration, see figure (2), which is
a broadband short to medium range HF/VHF-LO antenna. This configuration, which is especially designed to be
portable, is omnidirectional and provides ground wave communication on frequencies between 1.8 – 54.0 MHz
