CHA MPAS
Page 9
without using sky wave propagation. It also provides sky wave propagation, especially above 12 MHz. Using the
optional CHA JAW MOUNT, the Portable Vertical can be mounted on almost any support, such as a camouflage
netting support pole, fence post, picnic table, 3/8” heavy duty mobile mount, or the optional Chameleon
Antenna
TM
Tripod. The antenna works better when mounted above the ground, but will provide satisfactory
performance if ground mounted. One to four counterpoise wires, 25 feet in length should be used. They can be
quickly deployed and will provide good performance. You may also use the supplied 60 foot antenna wire as the
counterpoise. The antenna may also be attached to a standard 3/8” mobile mount on a stationary vehicle. No
counterpoise is required when the antenna is mounted on a vehicle. An antenna tuner or coupler is required on
most frequencies. Use the following procedure to install the Portable Vertical configuration.
Figure 2. Portable Vertical.
Site Selection and Preparation
1.
Select a site to deploy the CHA MPAS Portable
Vertical configuration. Best ground wave
communication occurs when the radio set is
located in a clear area and the whip antenna is
vertical.
2.
Clamp a CHA JAW MOUNT or other 3/8”
antenna mount to the support.
Refer to plates (2) through (4) for steps (3) – (8).
3.
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 a secure place.
Connect the Hybrid Micro Base.
4.
If used, place the terminal lugs of the
counterpoise wires over the Counterpoise
Connection (i) on the Hybrid Micro Base.
5.
Screw the Hybrid Micro Base Counterpoise
Connection into the 3/8” antenna mount until
finger tight.
6.
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
7.
Extend the CHA MIL EXT by unfolding the middle
section of the extension, fully seating it onto the
bottom section, then unfolding the top section
and fully seating onto the middle section.
