MFJ-4712 2-Position Remote Antenna Switch
Instruction Manual
2
INSTALLATION
1. The MFJ-4712 external unit can be located at any convenient location
using the U-Bolt package included with the unit. Any mast up to 1 ½
inches in diameter will fit.
2. Connect your Antennas to the SO-239 coax connectors on the MFJ-4712
external unit labeled
“Antenna 1”
and
“Antenna 2”.
3. Connect your Transmitter to the
“RF IN/OUT”
coaxial connector on the
MFJ-4712RC Remote Control using a 50-ohm coaxial cable. This is the
RF signal input connector. (See Figure 1)
4. Connect a standard DC 2.1 mm plug to the “
DC IN/OUT”
jack on the MFJ-
4712RC Remote Control
.
This is your DC voltage input connector. The
supply must be capable of supplying 300mA continuous at 12-15 volts DC.
This unit is polarity sensitive. It requires the following power connection:
The sleeve is negative, and can be grounded or floated at the power
supply. The center pin is positive, and MUST be ground isolated.
5. Connect the feedline coax that you will be running to your antennas to the
“RF/DC OUT/IN”
coaxial connector on the MFJ-4712RC Remote Control
using 50-ohm coaxial cable. This is your RF signal and DC power. The
MFJ-4712 external unit will recover the RF and DC signals.
6. Connect the feedline coax connected to the
“RF/DC OUT/IN”
coaxial
connector on the MFJ-4712RC Remote Control to the
“Transmitter”
SO-239 coax connector on the MFJ-4712 external unit.