Making a dish at home

D

deeptho

Specialist Contributor
My Satellite Setup
Wavefrontier T90, Laminas 120cm, 2 other dishes; tbs 5927, tbs6904, tbs6909x, tbs6903x, tbs5990, tbs6981,tbs5927
My Location
Europe
Some people have tried to make a dish at home, which requires a bit on ingenuity.
I found this video from someone trying to make some flat dish similar to an offset dish or a squarial.

Even though the design cannot work well in my opinion, he does get some signal on a satellite meter.


The reason it cannot work well is that the travel time of the waves to the LNB is not the same.
Therefore some signals will destructively interfere, e.g., whenever the difference in travel distance is an odd multiple of approximately
1.4cm for KU Band. Still the concept might work if the mirrors are not placed at equal distances but at well computed ones, but it
would also limit the bandwidth of the dish. It is still food for thought....

The same guy also has another system for making prime focus dishes. That one may actually work, but it requires some patience.
 
Yep, the second method works. Of course it would be wise to make raw bed from bricks or gravel with cement and plaster only last couple of centimeters very precisely, its give opportunity to start over with minimal cost/work if something goes wrong.

My suggestion is to make offset dish mold as this forgives more if some little mistakes are done during mold making. But still, the metal template must be precise and better use bearing joint, not that simple long bolt and nut combination.
 
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