CHA LEFS
Page 7
Figure (2) shows the End Fed Horizontal NVIS configuration. By reducing the height of the antenna to around 15
feet, and making the antenna wire horizontal, you can enhance NVIS propagation. You will need another support
and an additional length of paracord for the far end of the antenna.
Figure 2. CHA LEFS Horizontal NVIS Configuration.
Antenna Installation
Use the following procedure to install the Sloper configuration.
Site Selection and Preparation.
1.
Select a site to deploy the CHA LEFS Sloper
configuration. The site must have a support that
will position the Line Winder Assembly at a
height of 15 to 25 feet. If the right support is not
available, any available support can be used, such
as a fence post, hiking pole, or fishing pole with
reduced performance.
Raise the Antenna.
2.
If not already attached, using a Bowline, or
similar knot, attach the Paracord (f) to the
Suspension Point (b) of the Line Winder Assembly
(a); otherwise unwrap the Paracord from the Line
Winder Assembly.
3.
Using a throw weight or some other method,
loop the Paracord over the support.
4.
Unwrap the Antenna Wire (c) from the Line
Winder Assembly.
5.
Connect the Coaxial Cable to the Line Winder
Assembly UHF Connector Socket (e).
6.
Raise the Line Winder Assembly to the desired
height and secure it to the support using a Round
Turn and two Half Hitches, or similar knot.
Finish Installation.
7.
Fully extend the Antenna Wire, allowing some
sag in the wire. Do not make the Antenna Wire
taut.
The Antenna Wire is made from lightweight
20-gauge copper-clad Kevlar PTFE wire.
Although it is strong, compared to similar gauge
wire, it is not as strong as heavier gauge wire.
It
very is important not to over-tension the wire or
it may break.
8.
Insert a Tent Peg
(not supplied)
through the
Insulator Loop (d) and drive the Tent Peg into the
ground to secure the end of the Antenna Wire.
Alternatively, you can attach a short length of
high-stretch rope or shock cord
(not supplied)
to
the Insulator Loop and tie the end of the Antenna
Wire to a small tree or other fixed object.
9.
Connect the Coaxial Cable to the Radio Set and
perform an operational test.
