28
Differential voltages (+/–12 Vdc & 12 Vac) using terminal C. This can be done using a 1 or
2 conductor cable.
Economically priced
COM-CW-4
is
a 4 conductor control wire which may
be used.
See
Table 5
for the control matrix. The optional
DXE-FVC-1
can be used to
generate the required differential voltages using a 1 or 2 conductor cable. Feedline shield
can be used as the ground return.
Forward
Direction
Rear
Direction
Voltage on Coax or
J12 Term C
Direction
Shift
Element 1
Element 3
None
0°
Element 2
Element 4
+12 Vdc
90°
Element 3
Element 1
-12 Vdc
180°
Element 4
Element 2
12 Vac
270°
Table 5 - Differential Voltage Control Matrix
If you choose to use the feedline to provide power to the
DXE-RFS-2
, you will have to supply your
own coupling circuit to insert the re12 Vdc on the feedline.
Directional Control Using the Feedline
If you use the feedline for directional control, then you must provide power for the
DXE-RFS-2
using terminal C of the J12 connector. Terminals A & B are not used. A single conductor cable is
needed to power the
DXE-RFS-2
and active elements. Station power (n12 Vdc) can be
used provided a 1A in-line fuse is used.
Diagram 2
illustrates the coaxial cable being used for
directional control and the use of station power.
Using the feedline for directional control requires differential voltages to switch directions. Use
Table 5
for the control matrix. The optional
DXE-FVC-1
can be used to generate and couple the
required differential voltages to the feedline or a single conductor cable. The
DXE-FVC-1
can be
controlled with a EC-4 with a simple switch closure-to-ground scheme. The
DXE-FVC-1
provides
only the directional control voltages. Study the configuration diagrams on the next pages and the
Internal Jumper
Settings in
Figure 5
before making any changes to the default settings.
Diagram 2
shows the
DXE-FVC-1
and the
DXE-EC-4
used for directional control.
