CHA HYBRID - MINI / MICRO Page 10
unidirectional towards the end of the antenna wire as the frequency increases. The Sloping Wire requires one
support and should be mounted at a height of 25 to 40 feet for best performance. A 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. The “Half Sloper” is an alternate version of this
configuration, where the antenna is attached to a metal tower and the antenna is fed from the top.
Site Selection and Preparation.
1. Select a site to deploy the CHA HYBRID - MINI /
MICRO Sloping Wire configuration. The site
must have a support that will position the end
of the Antenna Wire at a height of 25 to 40 feet.
If the right support is unavailable, any
convenient object, such as a fence post or the
top of a vehicle, may be used as a field
expedient support with reduced performance.
Refer to plates (1) through (3) for the following steps.
2. If not already attached, connect a Carabiner (d)
to the Isolation Loop (c) at the Wire Connector
(f) end of the Antenna Wire.
Connect the Hybrid Base. .
3. Temporarily remove the Antenna Shackle (k)
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 Base.
Raise the Antenna.
8. Using a Bowline, or similar knot, tie a long
length (50 feet or more) of Paracord to the
Insulator (e) or Isolation Loop at the end of the
Antenna Wire.
9. Using a throw weight or some other method,
loop the Paracord over the support.
10. Raise the end of the Antenna Wire to the
desired height, and secure it to the support
using a Round Turn and two Half Hitches, or
similar knot.
11. Using a Bowline or similar knot, tie the end of a
short length (around 4 feet) of Paracord to the
Carabiner.
12. Fully extend the Antenna Wire so that it is not
quite taut,
13. Drive a Stake into the ground around two feet
beyond the end of the Antenna Wire and tie the
Paracord from the Hybrid Base to the Stake
using two Half Hitches, or similar knot.
Extend the Counterpoise.
14. If using a counterpoise wire, extend it along the
ground in any convenient direction.
15. Perform operational test.
Inverted “L”
The CHA HYBRID - MINI / MICRO Inverted “L” configuration, see figure (3), 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.