Feedsat's toys

  • Thread starter Thread starter Anonymous_1
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Aw, I see, it is purely theoretical exercise.... :) Theoretically, double-reflector satellite systems perform ~10% better than single-reflector ones. Do you have some experience also in practical satellite reception?
I just do not understand how the dimensions of the SUB can help you in your endeavor.
 
I suppose it would be off-topic to the topic of feedsat's thread.:D
Little experience like successfully installing a 60cm and a 90cm offset dish antenna.
I would try to establish a relationship between Sub and Main if it exist.
 
st2@88e said:
Nothing secret :) Not thinking to build anything.
Curious to know how dimension of sub-reflector increases with increase in dimension of main reflector (dish size) ? Is there any ratio between these two ?
I also want to know sub-reflector dimension of 3.8M Ku-Band Dual Optics Antenna (Series 1384 )
If you know please share here for all.:-clap
Click to expand...
The 1388 sub-reflector is a multi-construction where the backplate housing is bonded to the back of the parabola with an additional honeycomb filler. The assembly cannot be dismantled without damaging it.

The dimensions would be of no use in designing something along the same lines though I can confirm the main reflector has the same three dimensions as the 1383 model.
 
Where is this type of dish with double reflecror available?

Satellite Antenna SDP/16R Antenna Philips; Eindhoven |Radiomuseum.org

Satellite Antenna SDP/16R Antenna Philips; Eindhoven tubes international!; Miniwatt, build 1994, 1 pictures, Netherlands, schematics, tubes, semiconductors
www.radiomuseum.org www.radiomuseum.org
Philips dual reflector satellite dish antenna
How much improvement can I expect ?
 
rodscha said:
Where is this type of dish with double reflecror available?

Satellite Antenna SDP/16R Antenna Philips; Eindhoven |Radiomuseum.org

Satellite Antenna SDP/16R Antenna Philips; Eindhoven tubes international!; Miniwatt, build 1994, 1 pictures, Netherlands, schematics, tubes, semiconductors
www.radiomuseum.org www.radiomuseum.org
Philips dual reflector satellite dish antenna
How much improvement can I expect ?
Click to expand...
Specifications here.

Fibo Gregorian Dual Reflector Antenna Information

Fibo Gregorian Dual Reflector Antenna Information
www.satellite-calculations.com
 
that is,when Philips made good stuff! What do they sitill make today? a few bulbs?
 
I am not sure whether Fillips made those antennas at all. As far as I know, antennas were made in Norway by Fibo company, and they made them under different names, like Phillips, Delta Star, Fibo and maybe others. But I might be wrong here.
 
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