Monday, 17 August 2015

My take on the PA0RDT Mini Whip antenna.

I like shortwave radio because you can receive signals from all over the world, also there are all kinds of mysterious signals to explore.

In the grand scheme - the lower the frequency, the bigger antenna you would need. Well, there are all kinds of antenna designs but I like to think like that way. For example, I have a 27 MHz dipole on my roof that is around 5.3 meters long. If I wanted to listen to lower frequencies ~ around 3 MHz, for optimal performance I would need around 50 meter antenna, so using dipole for lower frequencies is not very space efficient, especially if you do not have any room.

So I decided to build the Mini Whip antenna. It is popular, simple to build and on paper receives frequencies from 10 kHz to 30 MHz, and also it is super tiny.

There are some variations between different designs, but the basic idea is the same.

The schematic I followed.

mini_whip_000

 

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During my tests it performed well, I was able to receive DCF77 signal for the first time. All other bands seemed to work as well.

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Overall fun little nifty antenna.

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For permanent outdoor use - one should probably use an enclosure.