MFJ MFJ-4712 User Manual

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
DC / RF
ANTENNA
1
ANTENNA
2

MFJ MFJ-4712 Specifications

General

Positions	2
Impedance	50 Ohms
Connectors	SO-239
Insertion Loss	0.1 dB
VSWR	1.2:1

Summary

Introduction

MFJ-4712 Supplied Components

Lists the components included with the MFJ-4712 antenna switch, such as the switch unit, remote control, and mounting hardware.

MFJ-4712 2-Position Remote Antenna Switch Features

Highlights key features including high power capability, wide frequency range, ease of use, versatility, and standard connectors.

Installation

Connecting Antennas and Transmitter

Guides on connecting antennas to the switch and the transmitter to the remote control via coaxial cables.

Power Connection and Feedline Setup

Details the DC power input requirements and connecting the feedline coax for signal transmission.

Operation

Selecting Antennas

Explains how to use the selector switch on the 4712RC to choose between Antenna 1 and Antenna 2.

Important Safety Warning

Warns against switching antennas while RF power is applied to avoid damage to contacts.

Technical Assistance

Contacting Support

Offers contact methods (phone, mail, FAX, email) for technical help with the unit.