Anyone tried to make BIG dish at home?

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midozalouk

New Member
Messages
3
My Satellite Setup
1.8 meter stb
My Location
cairo
What about using like 3 dishes and connect the lnbs to the same wire
Instead of making pipes
Or even connect them with disec
Sorry if it seems stupid idea
 
ozumo

ozumo

Member
Messages
478
My Satellite Setup
4x zone 2, 3x channel master 90cm, 1x channel master 1.2m
My Location
South Durham
If it was as easy as that then we'd all be doing it. You'd need to combine the signals in such a way that the timing of the signal from each dish was perfectly identical, and that is way beyond the abilities of us hobbyists :)
 
M

midozalouk

New Member
Messages
3
My Satellite Setup
1.8 meter stb
My Location
cairo
What about using 2 large offset feed dishes
And using the georgian or cassegrian design to project it to LNB


Would that allows us to receive out of horizon satellite

Something like that
 

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ozumo

ozumo

Member
Messages
478
My Satellite Setup
4x zone 2, 3x channel master 90cm, 1x channel master 1.2m
My Location
South Durham
No, same reasons as post #542. What does "out of horizon" mean?
 
M

midozalouk

New Member
Messages
3
My Satellite Setup
1.8 meter stb
My Location
cairo
No, same reasons as post #542. What does "out of horizon" mean?
But it isn't the same sir?

I will using 2 satellite dishes to project to Single LNB at the same time? Out of horizon mean out of reception area or out of foot print
 
D

davemurgtroyd

Regular Member
Messages
1,253
Location
Oxford
My Satellite Setup
See signature
My Location
Oxford
But it isn't the same sir?

I will using 2 satellite dishes to project to Single LNB at the same time?
It is the same reaason -distance signal travels from reflecting surfaces (dishes) would have to be identical to the micron or signals would be out of phase (and time lagged)
 
ozumo

ozumo

Member
Messages
478
My Satellite Setup
4x zone 2, 3x channel master 90cm, 1x channel master 1.2m
My Location
South Durham
But it isn't the same sir?

I will using 2 satellite dishes to project to Single LNB at the same time? Out of horizon mean out of reception area or out of foot print
It is the same, the timing of the two signals when they reach the LNB will be ever so slightly different. It doesn't matter if the signals are being joined at the LNB or in a cable, if they aren't perfectly in sync there won't be any benefit, if anything there will be losses as the signals cancel each other out. Feel free to create such a set up, I'd love to be proved wrong.
 
A

a33

Specialised Contributor
Messages
702
My Satellite Setup
XSAT410
Rebox RE-9000
My Location
NL
Timing/distancing ("in phase") is one thing, another thing (I think even more important) is the feedhorn I guess.
A feedhorn expects an 'equal' field of signal, so to say, preferably with the highest density in the center.
So if you create more parabolic surface (by combining several offset dishes), but with holes in it; then from the holes you receive noise. (Unless you have a feedhorn with a shape, that matches the exact illumination by the parabolas.)
Adding a secondary mirror (cassegrain or gregorian) doesn't alter that.

So the effect is that you get more signal, AND more noise. So the S/N ratio result will likely be about the same as with just one offset dish, or maybe even worse.

When you want a bigger dish surface: Buy/make a bigger dish! All other solutions are troublesome, or maybe even worse....

Greetz,
A33
 
Channel Hopper

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Messages
30,346
My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK
What about using like 3 dishes and connect the lnbs to the same wire
Instead of making pipes
Or even connect them with disec
Sorry if it seems stupid idea

One of our forum members has a clover - 4 leaf - design dish, they use the image as their avatar.
 
Lexzie

Lexzie

Member
Messages
188
My Satellite Setup
Xtrend ET10000 DVB-C, S2, T and IPTV, VU+ Zero 4k, Xtrend ET9500
80 cm fixed dish (28.2E/23.5E/19.2E/13E)
120cm Channel Master offset dish with polarmount (42E-34.5W)
My Location
The Netherlands
One of our forum members has a clover - 4 leaf - design dish, they use the image as their avatar.
You forgot to mention that it gave no better results than one dish.
 
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