MFJ MFJ-4714 User Manual

MFJ-4714 Desktop/Remote Antenna Switch Instruction Manual

Desktop/Remote Four-Position Antenna Switch

INTRODUCTION

The MFJ-4714 is a versatile multiple antenna switch designed to switch up to
four 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. See Table 1 for the best antenna
connection for your particular frequency.

The MFJ-4714 Desktop/Remote Antenna Switch uses a simple rotary switch to
select one-of-four antennas and connects those ports directly to a single
common port for a feedline. Use the MFJ-4714 Desktop/Remote Antenna Switch
on your desk or place it out-of-way under your desk or in another room and use a
remote control. In the OFF/Remote position, all inputs are grounded or control is
transferred to the MFJ-4714RC Remote Control. All unused inputs are grounded.
You can connect a sense line to your transceiver so when it’s off all inputs are
automatically grounded.

The MFJ-4714 will work well in nearly any system requiring switching of coaxial
lines, especially those requiring good quality 50-ohm RF switches. Any switch
port can be used as either an input or output, so you can select one-of-four
radios to one feedline or one-of-four antennas to a radio.

MFJ-4714 Desktop/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 rotary switch allows you to select one-of-four

antennas.

• Versatile: Use on your desk or place it out-of-way under your desk or in
another room and use a Remote Control.

• Lightening Protection: Ultra-fast gas discharge tube lightning surge
protector protects transceiver and safely shunts static electricity and
lightning induced surges safely to ground. All unused inputs are grounded.
Does not protect against a direct lightening hit.

• Radio Sense: You can connect a sense line to the 12VDC accessory jack
on your transceiver so when it’s off all inputs are automatically grounded.

• Standard Connectors: Uses SO-239 connectors.

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MFJ-4714 Desktop/Remote Antenna Switch Instruction Manual

ELECTRICAL CHARACTERISTICS

Frequency

(MHz)

1.8 1.0 1.0 1.0 1.0

3.5 1.0 1.0 1.0 1.0

7.1 1.0 1.0 1.0 1.0

14.1 1.1 1.0 1.0 1.1

21.0 1.1 1.1 1.1 1.1

29.7 1.1 1.1 1.1 1.1

54.0 1.8 1.5 1.5 1.8

150.0 1.7 1.5 1.5 1.7

Table 1: SWR for each Antenna Connection on Selected Frequencies

SWR for each Antenna Connection

1 2 3 4

INSTALLATION

1. The unit can be located at any convenient location, as long as it is not
exposed to moisture. It should be grounded to the station ground, and
preferably powered from a separate wall adaptor.

2. Connect your antennas to the SO-239 coax connectors numbered 1-4 and
note which antenna is connected to each connector.

3. Connect your feedline to the COMMON connector.

4. Connect the station ground to the GROUND connector.

5. If your Transceiver is equipped with a 12VDC accessory jack, you may
connect it to the Antenna Switch using a RCA plug so when your
Transceiver is off all inputs are automatically grounded.
You may also connect the Antenna Switch to your power supply using a
RCA plug, so when you turn off the power supply, all inputs are
automatically grounded.

6. If you are using the MFJ-4714RC Remote Control, connect the RJ-45
modular from the ANTENNA jack on the Remote Control to the REMOTE
jack on the back of the unit using a CAT-5 cable.

7. If your Transceiver is equipped with a 12VDC accessory jack, you may
connect it to the Remote Control using a RCA plug so when your
Transceiver is off all inputs are automatically grounded.

8. An additional remote mount option is to remove the cover, remove the
knob-shaft coupler using an Allen wrench and remove the knob. Now, the
unit can be placed facedown if desired.

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