A 23 elements 23cm yagi antenna
I have been looking around for antennas for a while for 23cm ATV reception. Everywhere I go, the prices are the same : far too high for me. The more elements you want, the higher the price of the antenna.
But than I saw Paul (PA0SON) walking with a nice and shiny 23 elements Tonna antenna. The design of the antenna is very straight forward. It's a boom made of aluminium with the elements 'floating' above it on plastic isolators.
I decided to try and rebuild the antenna using a PVC-tube to hold the elements. The elements I made of copper wire. In total this antenna cost me about 4 Euro. So for people with only a small hobby-budget this is a perfect project :)
The size of the elements
All elements are placed 4,2 cm above the boom except for the driving element. All elements have a 3mm diameter.
The measures of the driving element are shown in the following picture :
I could not see how the driving element of the Tonna antenna is connected to the coax cable, because the element is one big block of plastic. I connected the cable as shown in the following picture. It works very well, but maybe there is a better way of matching the transmitter to the dipole...
Some images of the antenna :
(click to enlarge)
- Created by Daan Vreeken - PA4DAN -
Email me with questions/comments : Daan <Daan @ pa4dan . nl>