MFJ-4712 2-Position Remote Antenna Switch Instruction Manual
1
Remote Two-Position Antenna Switch
INTRODUCTION
The MFJ-4712 is a versatile multiple antenna switch designed to switch two 50-
ohm antenna systems. It handles high power, up to 1500 Watts and sealed
relays offer excellent life and connection reliability. The unit is operational from
1-60 MHz and useable to 150 MHz. You can run coax to distant devices allowing
them to be placed anywhere regardless of power availability. The MFJ-4712 will
work well in nearly any system requiring switching of coaxial lines, especially
those requiring good quality 50-ohm RF switches.
The MFJ-4712 2-Position Remote Antenna Switch uses a simple slide switch to
select one-of-two antennas and connects those ports directly to a single common
port for a feedline. All unused inputs are grounded.
The MFJ-4712RC Remote Control is used to inject DC voltage onto coaxial lines.
The DC voltage is separated from the RF signal by the MFJ-4712 external unit
on the terminating end (See Figure 1).
MFJ-4712 Supplied Components
• MFJ-4712 Remote Antenna Switch with U-Bolt bracket
• MFJ-4712RC Remote Control
• U-Bolt Package
MFJ-4712 2-Position Remote Antenna Switch Features
• High Power Capability: Handles 1500 Watts/50-75 Ohm load.
• Wide Frequency Range: 1-60 MHz. Useable to 150 MHz.
• Easy-to-Use: A simple slide switch allows you to select one-of-two
antennas.
• Versatile: Mount the external box outside and control it from the
comfort of your station.
• Standard Connectors: Uses SO-239 connectors.
Figure 1: MFJ-4712 Remote Antenna Switch Operation Diagram
4712RC
Remote
Control
MFJ-4712
Remote
Antenna
Switch
DC
IN
RF
IN
ANTENNA
1
ANTENNA
2
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