Author: Marius Lubbe ZS1ML
Greetings, fellow ham radio enthusiasts! Today, I’m thrilled to share with you my journey of integrating the MFJ-4713 into my ham radio setup. This little known but fantastic solution is a 4-position remote antenna switch that caught my attention, and it has revolutionized the way I manage my antennas.
Let’s dive into the details, including the specifications of the MFJ-4713, and how I used it in a unique and efficient way.
MFJ-4713: A DETAILED LOOK
The MFJ-4713 is more than just a remote antenna switch; it is a solution to a common problem many of us face: managing multiple antennas without cluttering our space with coaxial cables. Here’s a detailed look at its specifications:
- Frequency Range: 1.8-150MHz
- Max Power: 1.5 kW PEP (1-150 MHz)
- Impedance: 50 Ohm
- Connections: 5 x SO 239 (4 for antennas, 1 for the transceiver)
- Power Supply for Remote Control: 12-15 VAC (included is a MFJ-AC 110V power adapter, ask for 220V if you need it at the time you order. I decided to use my normal 12V power supply feed and keep my 12V connections streamlined in the shack by using Powerpoles with my excellent MFJ-1124 DC POWERSTRIP)
- Outdoor Unit Dimensions: 12.7 x 10.8 x 4.5 cm (5 x 4.25 x 1.77 inches)
- Control Unit Dimensions: 9.6 x 7 x 3.8 cm (3.78 x 2.75 x 1.49 inches)
- Weight: 0.71 kg (1.56 lbs)
TYPICAL INSTALLATION OF THE MFJ-4713
MY INSTALLATION:
Connecting to IC-7300
I started by connecting a coax cable between my IC-7300 and the small remote-control unit of the MFJ-4713. This allowed me to manage the switch from my shack. It was a simple connection, and the remote-control unit was compact and easy to place close to my hand.
Running a Single RG213 Coax (You can use a similar low-loss, high power capable coax as needed)
I ran a single RG213 coax from the remote-control unit in my ham shack to the external remote antenna switch. This meant I didn’t have to deal with a large amount of coax cables running through my roof to the other side of the house. The RG213 coax was robust and provided a reliable connection.
External Antenna Switch Installation as Designed:
The remote switch box is designed to be mounted upside down on a mast or on a wall, with all the connectors pointing downwards, which will protect it from water ingress. This is how I mounted it and it works a treat.
Optional Waterproof Box Installation:
You can, if you are a belts and branches type of person., mount the remote antenna switch in a suitable waterproof box on the wall, close to the antennas, where the single coax cable exited. This protects the switch from weather elements and ensures a long-lasting setup.
The location of the box, being close to the antennas, allowed for shorter coaxial connections and a more efficient setup.
Connecting to Various Antennas
From the external switch box, I ran four shorter lengths of suitable coax to my various antennas, including a Hexbeam 10-40m and MFJ Octopus antenna with 10m, 20m, 40m, and 80m hamstick pairs, as well as my DX Commander Classic and 10-80 EFHW sloper on a MFJ-1917 FIBREGLASS ANTENNA POLE. This allowed me to switch between antennas seamlessly, and the MFJ-4713 handled the transitions smoothly.
Efficient Cable Management
By using the MFJ-4713, I eliminated the need for multiple coax cables running through my house. This not only saved space but also made for a cleaner and more organized setup. The single coax cable approach was a revelation, and it transformed the way I managed my antennas.
Reflections on the Experience
The MFJ-4713 was a joy to work with and easy to install. Its design and functionality were well-thought-out, and it provided a practical and efficient solution for managing multiple antennas. The installation process was straightforward, and the user manual was clear and concise.
I found the remote-control unit to be user-friendly, with easy-to-understand buttons and indicators. Switching between antennas became a breeze, and I could focus more on my ham radio activities rather than worrying about cable management.
The waterproof box was an essential addition, and I recommend it to anyone planning a similar setup. It provided an extra layer of protection and peace of mind, knowing that the switch was safe from the elements.
Conclusion
The MFJ-4713 offered a practical and efficient solution for managing multiple antennas. In my case, it allowed me to run a single coax cable from my shack to the external remote antenna switch, neatly housed in a waterproof box. From there, I connected to various antennas without the clutter of multiple cables.
This setup was not only functional but also an inspiration for anyone looking to streamline their ham radio experience. The MFJ-4713 proved that with a little creativity and thoughtful planning, we could enhance our setups in ways that were both functional and aesthetically pleasing.
I hope this gives you some food for thought and opens your vista for your own antenna farm.
