10/24 GHz feed system
 |
 |
 |
 |
| Pic. 1 | Pic. 2 | Pic.3 | Pic. 4 |
Pic. 1 shows the 24 GHz feedhorn mounted above the 10 GHz feed on the 65cm offset dish. Attenuation in the flexwaveguide/90 degr. bend from the 24 GHz transverterbox behind the dish to the feedhorn is app. 1 dB, where 0,3 dB comes from the 90 degr. bend. The feedhorn is Art.Nr. 11813 from UKW-Berichte and it has 16 dBi gain.
Pic. 2 shows how i found the focuspoint on the
10 GHz feedhorn using a laser spirit level.
Pic. 3 shows how I found the 24 GHz focuspoint by elevating the dish 5.8 degr.
Pic. 4 shows the modified support for elevating the dish. The motor is a Danfoss gearmotor and it was used to control of valves in central heating systems. The motor has 2 endstop contacts adjusted to minimum 0 and maximum 10 degr. elevation at 10 GHz.
The idea for this concept came from discussions with Gerard, PA0BAT at the UKW-Tagung in Weinheim.
Updated 2014-08-25