15-40 Meter Spring Loaded Linked Dipole V 2.0

After the trial run of the Linked Dipole over the Easter weekend, several problems emerged, the main one being water entering the feedpoint, the other was not having a clear view as to whether the antenna was on the 15 or 40 meter band.

The water problem was an easy fix, I just changed the feedpoint to a multi purpose one that I had made a few months ago. It can be used either with coax via a SO-239 or fed by Open Wire Feeder using banana plugs. The whole assembly is enclosed in a weatherproof box.


The second problem was also an easy fix. The original automotive fuse holders have been replaced with heavier duty ones, the type that screw together. These also have a heavier spring in them, requiring a bit more tension to break the connection. They are also a bit easier to waterproof by sealing the top section with Araldite or Silicon sealer.

I also replaced the free floating aluminium connectors with pieces of copper cable that has been soldered to the connection at one end. I have made these 5 mm longer than the original glass fuse to increase the tension needed to break the connection, making it more reliable when the antenna is moving about in the wind.


Visual indicators were added as well. A strip of reflective tape was added to the 40 meter section so it can be seen at night if the antenna is set for the 15 meter band & is not visible when using 40 meters.



After the modifications were made it was back on the MJF antenna analyzer for a check, with both bands reading 1.1:1. Now all that is needed to change bands is increase the tension on the guy rope at one end. A difference of 150 mm is all that is needed to change between 15 & 40 meters. This eliminates the need to lower the whole antenna to change the links.


Hopefully this version will perform well, I will be giving it a test over the weekend. It will only work as an Inverted V, the weight of the coax when hung as a flatop is too much for the spring loaded connections, but it was designed to be used as an Inverted V, so that is how it will be used.

Feel free to use this design, let me know how it goes!


Link to Version V.1


4 thoughts on “15-40 Meter Spring Loaded Linked Dipole V 2.0

  1. Pingback: Gwydir River National Park VKFF-593 | VK2FMIA.COM

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