Last Revision: 02 June 2008
The ZX 6-6 Yagi Antenna with 2m and 70cm Antennas
above
I put up this 6 element yagi (ZX Antennen) in May 2008. The claimed gain is 12,5 dB (dBd or dBi ??). I wanted to know, if the antenna is as good as it is claimed. Here are some results of the simulation I made with EZNEC+.
The antenna is very rugged and heavy (ca 18kg). Hopefully this helps against the raven birds and the 160km/h wind gusts.
Antenna Dimensions
For the simulation I corrected the elements lengths. I
deducted 20mm from each element, to correct for the boom
diameter. The elements are mounted with large clamps on
the 50mm diameter boom. I think I get close to the real
value by doing so. The values above are the values given
in the datasheet.
AZIMUTH Diagram in Free Space
ELEVATION Diagram in Free Space
The Antenna at 9,6m above ground level
The Antenna at 9,6m above ground level (Primary)
compared to the same antenna at 25m.
This simulation shows the advantage of an antenna mounted
high above the ground. If you compare at an elevation
angle of 3° you will see more than 6 dB of gain. And that
is the difference regarding DX signals. I can not realize
this ... Nevertheless comparing with my old 4 element
antenna I can see a big improvement. The clean pattern
make a very noise-free band. It is very astonishing, that
I can hear many backscatter now, which were "not there"
with the smaller antenna.