New Multifeed Setup

[stel883_]

Due to strong winds, i decided to convert my 2 motorized dishes, to fixed with multiple lnb's.

Gibertini OP125L - 13E 19.2E 23.5E, Gibertini 3 lnb holder



Gibertini OP100L - 39E 42E, Universal 3 lnb holder

 

[stel883_]

Here are some general signal readings.

Gibertini OP125L
13E, 19.2E, 23.5E



Gibertini OP100L
39E, 42E

 

[stel883_]

I would like to give a mention to @Serafeim and @satkingdom, who inspired me.
Thank you

 

[a33]

Nice dishes.
Do you have the rail for 13E 19.2E 23.5E exactly horizontal? For Vatika, 36.5N, 23.0E the rail skew would theoretically be +5 degrees (measured in the plane perpendicular to the viewing direction of the LN, so with the 13E LNB a bit higher.

For 39(Central) and 42E, the present rail skew seems to be about the theoretical -20 degrees, so that looks OK.

Greetz,
A33

 

[stel883_]

Yes, the rail is exactly horizontal, 19.2E is central satellite. I purchased the Gibertini 3 lnb holder first, and the Universal 3 lnb holder later, so i didn't have a chance to test, to see if the Universal holder would be placed differently.

 

[a33]

Yes, the rail is exactly horizontal, 19.2E is central satellite. I purchased the Gibertini 3 lnb holder first, and the Universal 3 lnb holder later, so i didn't have a chance to test, to see if the Universal holder would be placed differently.

OK, I understand.
Might it be possible to skew the rail a bit, by putting an extra spacer or so at one side of the rail?
Or skewing the dish as a whole (and the rail with it), might also have the extra skew effect.

Otherwise, thankfully 5 degrees skew is very near horizontal...

Greetz,
A33

 

[stel883_]

I hadn't thought, about the extra spacer of the rail, i don't think the dish can be skewed?

I will try with a Universal 2 lnb holder, on an extra lnb at 16E.
If that dosen't work i'll swap it for the Universal 3 lnb holder, from the Gibertini OP100L.

 

[stel883_]

I forgot, that i have only 3 lnb brackets on the Gibertini holder.
What about a spacer on the part, where it's attached on the end of the feedarms?

 

[a33]

What about a spacer on the part, where it's attached on the end of the feedarms?

That is what I had in mind. But that is of course only possible if there are bolt + nut connections. Is that the case?
Worth a try, then.

Skewing the dish: that would be skewing the pole, effectively. And the dish and the rail with it.
In fact, from theory: skewing the dish would be slightly better that skewing just the rail. But the effect is marginal.

Greetz,
A33

 

[stel883_]

Yes, there is nuts & bolts, i placed 2 washers on the feedarms, under the bracket, to the right.
It managed to work.



Here, are the new signal readings.
13E, 19E, 23.5E

 

[stel883_]

Thank you @a33

 

[stel883_]

I decided to try the Universal 3 lnb holder, it works well. I purchased the Gibertini 3 lnb holder from a local shop, i would have gone with a 4 lnb holder, but it wasn't available.
I did place a slim lnb at 16E with my hand, signal level was 15.5db. Anyway i'm still trying to figure out, which satellites i want in the future. By adding more Universal lnb holders.

 

[ALPER ULUDAG]

Posts bystel883 reminded me of a US Signal station in Nicosia, used on signal gathering.(Its been dismantled now, before I could take a pic).It had at least 20 LNBs on a giant rectangular offset dish.

 

[stel883_]

I combined both lnb holders, to get 16E finally, i will be getting a Universal 2 lnb holder for Gibertini OP100L dish.



Here are 2 readings at 16E

 

[ALPER ULUDAG]

Well done Stelios. I prefer to keep my motorized despite wind load since my interest ranges from 54E to 18W.

 

[stel883_]

I will be adding one more dish, in the future, for more satellites. There are 3 bolts already in place, for a triangular base.

 

[stel883_]

On my previous attempt, i was not satisfied enough, there was too much play in combining the 2 lnb holders.
I went back to the Universal 3 lnb holder, but i changed focal point, from 19E to 13E.



Here are the new readings. 7E, 13E, 16E

 

[stel883_]

I ordered a Universal 2 lnb holder and Golden Media 201+ Single lnb, but they sent me a Universal 3 lnb holder and a ALFASTAR A-10 Single lnb instead. It was from a greek online shop, anyway i decided to keep the products. The Universal 3 lnb holder was thinner than my other one, the steel part.

I gained an extra bracket from this, so i placed it on the Gibertini OP125L at 10E, and on the Gibertini OP100L, i put the remaining 2 brackets at 39E and 42E.

I will add pictures later on.

 

[stel883_]

Gibertini OP125L
7E, 10E, 13E, 16E



Gibertini OP100L
39E, 42E