21
Alternate Configurations
The
DXE-RFS-2
can be configured to use the coaxial feedline for power or directional control, but
not simultaneously.
Diagram 2
illustrates one way to use the feedline for directional control with
optional hardware. Other configurations are possible. Do not make contradictory jumper settings.
Any alternate configuration requires changing the internal jumpers from their default settings.
Be very careful about changing the default jumper settings.
You must not jumper the DXE-
RFS-2 so that power and directional control are done on the same conductor
. This will
damage the
RFS-2
or the
ARAV-3
active elements and is not covered under warranty.
Supplying Power Using the Feedline
If you use the feedline to supply operational power, then directional control must be done using the
J12 connector. There are two ways to do directional control through J12 when using the coax for
power:
•
Differential voltages (+/–12 Vdc & 12 Vac) using terminal C. This can be done using a 1 or
2 conductor cable.
Economically priced
DXE-CW9
is
a 9 conductor Shielded 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.
•
2 bit BCD style control voltage using terminals A & B.
See
Table 4
. This requires at least a 2 conductor cable.
Economically priced
DXE-CW9
is
a
9 conductor Shielded Control Wire which may be used.
The feedline shield can be used for the
ground return provided it is grounded at the common power source.
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 coax 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 CC-8A 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 on page 26 before making any changes to the default settings.
Diagram 2
shows the
DXE-FVC-1
used for directional control.
