Satellite dish types
- Thread starter johan
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My C band dish is prime focus, Ku dishes are offset focus. I've only seen cassegrain on really big commercial earth stations. And Gregorian maybe look at those threads here where a guy is experimenting with reflecting signals between multiple dishes. Pic related is my 8.5 ft C band dish
Don't let the Kitty get microwaved.......
Happiness is a warm .... kitty? lol.Don't let the Kitty get microwaved.......
Fried pussycat!Don't let the Kitty get microwaved.......
View: https://www.youtube.com/watch?v=2Ou9cg0dR9Y
I have the following types installed:
- Offset;
- Offset Gregorian;
- Offset Cassagrain;
- Prime-focus Gregorian;
- Prime-focus Cassagrain.
Do not have simple Prime-focus ATM, but it is not something very special.
- Offset;
- Offset Gregorian;
- Offset Cassagrain;
- Prime-focus Gregorian;
- Prime-focus Cassagrain.
Do not have simple Prime-focus ATM, but it is not something very special.
In Canada I use prime focus C-band and offset Ku reflectors, that is except right now I am using one offset dish for C-band but it's 2.4m diameter.
One of the prime focus dish reflector has a buttonhook like the image above, the rest have the LNBF supported by struts.
Local uplink center uses cassagrain reflectors, likely out of convenience, since the feedhorn can then be located very close to the transmitter and traveling wave amplifier behind the main reflector to minimize waveguide losses.
If you are far north the offset dishes work better because the snow slides right off.. bit of wax once a year helps too.
Suppose if someone gave me a big cassagrain dish I would have to put it to good use, maybe for 10GHz EME?
Prime focus gregorian... thought that was the same as a cassagrain. I might require some education here... or Rima can you supply a photo?
One of the prime focus dish reflector has a buttonhook like the image above, the rest have the LNBF supported by struts.
Local uplink center uses cassagrain reflectors, likely out of convenience, since the feedhorn can then be located very close to the transmitter and traveling wave amplifier behind the main reflector to minimize waveguide losses.
If you are far north the offset dishes work better because the snow slides right off.. bit of wax once a year helps too.
Suppose if someone gave me a big cassagrain dish I would have to put it to good use, maybe for 10GHz EME?
Prime focus gregorian... thought that was the same as a cassagrain. I might require some education here... or Rima can you supply a photo?
12' Button hook feed prime focus. Ku lnbf offset from center to get around the signal loss if it were aimed at dish center. Ku degree offset from C-band sats is 6 degrees east. Trial and error shows button hook hardware offset 45 degrees from true H-V provides more signal strength. Some boot waterproofing and a hair dryer in the fall keeps snow and sleet buildup to a minimum.
Memory serves me well. The cassegrain/gregorian feed commercial dishes from days past had a pressurized waveguide with a mylar window. From when LNA's were measured in degrees kelvin.
Memory serves me well. The cassegrain/gregorian feed commercial dishes from days past had a pressurized waveguide with a mylar window. From when LNA's were measured in degrees kelvin.
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The OP didn't post a picture so what is this nonsense about not letting the kitty get fried?Look at the picture
Guessing you have your defenses set too high. There is a picture.
From far away, they may look the same, both double reflection systems. But one has convex SUB, another one concave SUB.
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I still don't see a picture associated with the OPs first post. Immediately after that first post someone said don't let the kitty get fried. So why are you slamming me?
Slamming you? haha No, I was joking that you must have your ad-blocker or similar set too high.
Only other guess is you have the poster right after him, that posted the picture, blocked.
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