CHA HYBRID - MINI / MICRO
Page 14
Inverted “L”
The CHA MPAS Inverted “L” configuration, see figure (6), is a broadband short to medium range HF antenna. This
configuration tends to be unidirectional, favoring the end of the horizontal part of the antenna. It is also provides
effective ground waves communication during the day time on frequencies between 1.8 – 4.0 MHz without using
sky wave propagation. The Inverted “L” requires two supports and should be mounted at a height of 25 feet for
best performance. Though, it will provide good performance at a height of 10 to 20 feet, and is usable when
mounted as low as three feet. One counterpoise wire, with a length of 20 to 40 feet, is recommended. If a
counterpoise is not used, the coaxial cable must be 25 to 100 feet in length, as the shield of the coaxial cable
provides the counterpoise. Use the following procedure to install the Inverted “L” configuration.
Figure 6. Inverted “L” Configuration.
Site Selection and Preparation.
1.
Select a site to deploy the CHA MPAS Inverted
“L” configuration. The site must have two
supports that will position the corner of the “L”
and the end of the Antenna Wire around 35 feet
apart at a height of about 25 feet. If the right
supports are unavailable, any convenient
objects, such as fence posts or the tops of
vehicles, may be used as a field expedient
supports with reduced performance.
Refer to plates (2) and (3) for steps (3) – (12).
2.
If not already attached, connect a Carabiner (d)
to Isolation Loop (c) at the Wire Connector (f)
end of the Antenna Wire (b).
Connect the Hybrid Micro Base.
3.
Temporarily remove the Antenna Shackle (j)
from the Antenna Connection (h).
4.
Place the Wire Connector from the Antenna
Wire over the Antenna Connection and replace
the Antenna Shackle. Tighten the nut snugly.
5.
Connect the Carabiner from the Antenna Wire
to the Antenna Shackle.
6.
If using a counterpoise wire, connect it to the
Counterpoise Connection (i). Tighten the nut
(not supplied)
snugly.
7.
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.
Содержание CHA MPAS
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