MFJ-4726 Desktop/Remote Antenna/Transceiver Switch |
Instruction Manual |
Desktop/Remote Six-Position
Antenna/Transceiver Switch
INTRODUCTION
The MFJ-4726 is a versatile multiple antenna/transceiver switch designed to switch up to six 50-ohm antenna systems or six transceivers in any combination.
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 and 2 for the best Antenna/Transceiver combination for your particular frequency.
The MFJ-4726 Desktop/Remote Antenna/Transceiver Switch uses two simple rotary switches to select one-of-six antennas or six transceivers in any combination. Use the MFJ-4726 Desktop/Remote Antenna/Transceiver 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-4726RC 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-4726 will work well in nearly any system requiring switching of coaxial lines, especially those requiring good quality 50-ohm RF switches, so you can select one-of-six radios to one feedline or one-of-six antennas to a radio.
MFJ-4726 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: Two simple rotary switches allow you to select one-of-six antennas and one-of-six transceivers.
•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 your radio is off all inputs are automatically grounded.
•Standard Connectors: Uses SO-239 connectors.
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MFJ-4726 Desktop/Remote Antenna/Transceiver Switch |
Instruction Manual |
ELECTRICAL CHARACTERISTICS
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SWR for each Antenna Connection |
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Frequency |
1 |
2 |
3 |
4 |
5 |
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6 |
(MHz) |
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1.8 |
1.0 |
1.0 |
1.0 |
1.0 |
1.0 |
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1.0 |
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3.5 |
1.0 |
1.0 |
1.0 |
1.0 |
1.0 |
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1.0 |
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7.1 |
1.0 |
1.0 |
1.0 |
1.0 |
1.1 |
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1.1 |
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14.1 |
1.1 |
1.0 |
1.0 |
1.1 |
1.1 |
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1.1 |
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21.0 |
1.1 |
1.1 |
1.1 |
1.1 |
1.1 |
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1.1 |
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29.7 |
1.1 |
1.1 |
1.1 |
1.1 |
1.1 |
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1.1 |
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54.0 |
1.8 |
1.5 |
1.5 |
1.8 |
2.1 |
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2.1 |
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150.0 |
1.7 |
1.5 |
1.5 |
1.7 |
2.2 |
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2.2 |
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Table 1: SWR for each Antenna Connection on Selected Frequencies |
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SWR for each Transceiver Connection |
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Frequency |
A |
B |
C |
D |
E |
F |
(MHz) |
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1.8 |
1.0 |
1.0 |
1.0 |
1.0 |
1.0 |
1.0 |
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3.5 |
1.0 |
1.0 |
1.0 |
1.0 |
1.0 |
1.0 |
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7.1 |
1.0 |
1.0 |
1.0 |
1.0 |
1.1 |
1.1 |
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14.1 |
1.1 |
1.0 |
1.0 |
1.1 |
1.1 |
1.1 |
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21.0 |
1.1 |
1.1 |
1.1 |
1.1 |
1.1 |
1.1 |
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29.7 |
1.1 |
1.1 |
1.1 |
1.1 |
1.1 |
1.1 |
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54.0 |
1.8 |
1.5 |
1.5 |
1.8 |
2.1 |
2.1 |
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150.0 |
1.7 |
1.5 |
1.5 |
1.7 |
2.2 |
2.2 |
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Table 2: SWR for each Transceiver Connection on Selected Frequencies
Tables 1 & 2 show the SWR for each Antenna and Transceiver Connection. To determine the best Antenna and Transceiver combination for your particular frequency, simply choose the connections with the best SWR on the desired frequency and match them.
For Example: At 150MHz, the best Antenna connection is 2 or 3 and the best Transceiver connection is B or C. Therefore, I will connect my Antenna to connection 2 or 3 and my Transceiver to connection B or C.
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