Most Fan Dipoles have a low to high band wire order (top-down). This might be the best solution, but I experimented changing the order. Putting higher frequencies between lower frequencies.
In this version the 20m wire is in the middle. So the order is:
My third fan-dipole will be a more robust antenna than the previous more experimental ones. So therefore ... I will give up some higher bands (10m / 6m).
And, the 160m band must be included... (for many decades the lowest radio frequency band allocated for use by amateur radio)
Main goal is to end up with a fan of resonant dipole antennas on all the included bands.
My garden is to small for full-size 80m and 160m band dipoles, so I had to shorten and or fold (and even combine) some dipoles.
Most fan dipoles have a low to high band wire order (top-down). This might be the best solution, but I experimented changing the order. Putting higher frequencies between lower frequencies. Each configuration is measured (SWR / impedance / Smith diagram). Results presented on the following pages.
This is the second version of the fan dipole.
Most Fan Dipoles have a low to high band wire order (top-down). This might be the best solution, but I experimented changing the order. Putting higher frequencies between lower frequencies.
In this second version the 6m and 10m wires are swapped. So the order is now:
This is the first attempt for the fan dipole.
Measurements (SWR, impedance) after quick tuning of dipole wires to give a first impression. Not all dips on frequencies where I want them to be...
Most Fan Dipoles have a low to high band wire order (top-down). This might be the best solution, but I experimented changing the order. Putting higher frequencies between lower frequencies. Results shown below have this order:
The Fan dipole for 40/20/6m performs well. Now it's time to extend the Fan with more bands.
I want to add dipoles for 80m, 15m and 10m. Making it a resonant antenna for all bands from 80m to 6m (except WARC bands).
Adding more parallel dipoles will make the angle at the centre sharper for some the bands (the lower wires). This will affect the radiation pattern. It also decreases the impedance for those bands.
These antennas can be compared on 20 and 40m. On 20m both antennas are half wave length. On 40m the Fan is half wave dipole, where the End Fed is extended and effectively a quarter wave, so about -3dB less gain.
Both antennas are about 10m above the ground at there feed point. Sloping down to about 5m above ground. Radiation direction is approximately North - South.
Each band has its own resonant dipole wire pare.
To feed the balanced dipole from 50Ω coax a Balun is needed. I use a D-Original BU-55 balun for this. Frequency range 3 to 75 MHz. Impedance 50 Ω. Ratio: 1:1. Maximum power 500 Watt PEP.
I build this antenna to have a reference antenna for 20 and 40m.
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