Azimuth & elevation system for mobile use

1. Azimuth system

At higher frequencies and with bigger dishes -3dB beam width gets smaller and smaller. E.g. for 76GHz with a 60cm dish it is around 0.6. Therefore a stable azimuth system with fine adjustment is essential.


1st version:
Dish rotation was done manually by hand without any fine adjustment system.


2nd version:
Not stable enough and without azimuth scale. Coarse (0-360) and fine adjustment (+/- 5). One screw rotation is approx. 0.75.




3rd version:
With coarse (0-360) and fine adjustment (+/- 5). One screw rotation is approx. 0.50 and azimuth angle resolution is approx. 0.01. Now with an azimuth scale to read angle and it is very stable. Max. load should only be 50N (5 kg).








4th version:
The SEMR160-AR is the bigger brother of 3rd version with a diameter of 160 mm. Big advantage is that the load could be up to 390 N (max 39 kg), but it is heavier (2.2 kg).







2. Elevation system

At higher frequencies and with bigger dishes -3dB beam width gets smaller and smaller. E.g. for 76GHz with a 60cm dish it is approx. 0.6. Therefore a stable elevation system with fine adjustment is essential.


1st version:
Backslash was not small enough, not stable enough and elevation scale was only roughly.




2nd version:
Backslash was better but not small enough. It has a fine tuning screw with scale (0.1 accuracy).




3rd version:
Stable spindle system with digital tilt meter (0.1 accuracy). One spindle rotation is approx. 1.5 and therefore elevation angle resolution is down to 0.02.



3. Azimuth-elevation system

Old 2nd version for my tripod:
Resolution azimuth: 0.025
Resolution elevation: 0.1




Finished 3rd version for my tripod:
Resolution azimuth: 0.01, 0.45/screw rotation
Resolution elevation: 0.02, 1.5/screw rotation




Finished 4th version for my tripod:
Now for a heavier load

Resolution azimuth: 0.01, 0.45/screw rotation
Resolution elevation: 0.02, 1.5/screw rotation