Ground station antennas
Our ground station has two Yagui model X-Quad from Wimo for both 2 m and 70 cm bands.
Antenna used in 2 m band is the following:
Antenna used in 70 cm band is the following:
This table shows their characteristics, note the geometry of the 2m antenna that allows double polarization.
|2m X-Quad||70cm X-Quad|
|3dB HPBW horizontal (E)||47||36||Deg|
|Windload a 160km/h||74||48||N|
|Connector||2x N jacks|
|Connector for circular polarisationNo.||18047||18049|
We can work in both vertical and horizontal polarization; moreover, if we use an emphaser we would work in LHCP and RHCP polarization.
In a radio-link between the satellite and the ground station we need circular polarization because radio waves passing through the Earth’s ionosphere are likewise subject to Faraday effect. You can look up a better explanation in the book: Antenas, ediciones UPC, Cardama y otros. Tema 2: Propagación.
The following figure shows the radiation pattern of both antennas:
No, we show you some photos of our antennas: