Dish 78cm 4LNB

[eliosfederico]

Hi everyone.
I'm new on this forum and also quite new on the sat world. I recently bought a TRIAX dish 78cm with 4 LNB 13,19.2,23.5,28.5. I don't have any high quality satfinder and I used a cheap one and the satfinder in the dreambox for point the dish. The problem is that I get around 80% signal on Hotbird (Sky IT transponder), 92% on Astra 19.2., 75% on Astra 23.5 and also around 90% on Astra 28.5. Why on hotbird and astra 23.5 the signal is lover? Because of that, with heavy rain storms I can get some problems on that satellites. What can I do/check?

Here a photo of the dish:

Original size: http://i43.tinypic.com/21dg27t.jpg
Lnb photo: http://i43.tinypic.com/1z3qj9x.jpg

Thank you!

 

[csell]

Hi Eliosfederico.

I can't se where you live. The signal will some places be lower for some satellites.
But I don't expect that to be the problem. As I se your pictures have you not adjusted the screw
( the rotation of the LNB in the holder )

If you go to dishpointer.com and enter your address and select the satellites, one at a time,
will it show you how many degrees you have to turn the LNB clockwise or anticlokwise to get a good signal.

You have then to fine adjust it acording to your reading on the Dreambox.

Regards Carsten.

 

[mdt]

have you ajusted the skew on the lnb,s to max the signal as from the picture they all look to be at around zero degree,s.

regards mdt

 

[eliosfederico]

Hi,
If I rotate the lnb I get immediately no lock. So the skew have to be 0 or I get no signal.

 

[csell]

Hi,
If I rotate the lnb I get immediately no lock. So the skew have to be 0 or I get no signal.

That is not correct. May be you then have more than one problem.
Please go to Dishpointer.com and enter your address and select the satellites, one at a time and se the LNB Skew under the picture?

Carsten.

 

[eliosfederico]

That is not correct. May be you then have more than one problem.
Please go to Dishpointer.com and enter your address and select the satellites, one at a time and se the LNB Skew under the picture?

Carsten.

Hi,
On dishpointer.com I can select only 28.2, 19.2 and 13. But anyway it says dish skew 79.8°

 

[eliosfederico]

Maybe I wrong the position of the lnb's. I saw a photo of someone with my same configuration but he has 2 lnb then middle and then 2. I have 3 middle 1.

 

[csell]

Maybe I wrong the position of the lnb's. I saw a photo of someone with my same configuration but he has 2 lnb then middle and then 2. I have 3 middle 1.

Hi.

No your configuration is OK. Some years ago I installed a 75 cm disc with 3 midle and 2 in southeast of Spain. Where do you live?

Carsten.

 

[eliosfederico]

Hi.

No your configuration is OK. Some years ago I installed a 75 cm disc with 3 midle and 2 in southeast of Spain. Where do you live?

Carsten.

The Netherlands. The photo I saw from someone else was also here in The Netherlands. With that configuration 2 - 2 he had 100% on 19.2 and for the rest 84%

 

[csell]

Hi.

I checked the skew for Roterdam. The are all between -3.8° and -10.0° So I don't expect that to be the problem any more.

I used also a Triax Multiblock, but on a 75 cm non Triax Dish. I had 5 lnb's 19,2E, 13E, 7E, 0.8W and 7W. Of cause I had less signal from the outermost LNB's, but they was futher out than yours. And you are not complaining on the one to the left in the picture ( 28.2 ). You are complaining on the 1 and the one in the mittle of the 3. I wonder if you have tried to adjust the LNB back and forward in the holder?

Carsten.

 

[eliosfederico]

Hi.

I checked the skew for Roterdam. The are all between -3.8° and -10.0° So I don't expect that to be the problem any more.

I used also a Triax Multiblock, but on a 75 cm non Triax Dish. I had 5 lnb's 19,2E, 13E, 7E, 0.8W and 7W. Of cause I had less signal from the outermost LNB's, but they was futher out than yours. And you are not complaining on the one to the left in the picture ( 28.2 ). You are complaining on the 1 and the one in the mittle of the 3. I wonder if you have tried to adjust the LNB back and forward in the holder?

Carsten.

I did. Then I fixed them on the position that gave me the most signal. What actually made the signal stronger was to bend the rail down to the side of the 13E lnb. But now it reached the max it can bend so I don't know...

 

[csell]

Hi.

On the Picture I can't se if your Triax Multiblock is strait and level, it should not be level.

The Multiblock is mounted by a screw trough a small hole in one side of the aluminium profile.

On mine I had to twist the aluminium profile around to be able to turn it so it is high in one side and low in the other side.


I checked the elevation on Dishpointer for your 4 satellites:

Elevation for Spain: 43.7° - 41.3° - 39.2° - 36.7°

Elevation for Netherland: 30.1° - 29.0° - 28.0° - 26.6°

Your difference in elevation is only half of the difference in elevation for Spain so you only have to turn the Multiblock half as much as I did. But the Multiblock have to be turned down in one side and up in the other for best signal.

As I remember, did I do a lot of small ajustment in the days after I mounted it. I could not get everything adjusted as I wanted. I did a lot of small compromices. And suddently all 5 LNB worked.

Next month will there be a change of satellite at 28.2E. From Astra 1N to Astra 2E. The Astra 2E UK beam will be narrower. May be you will want to move the 28.2E LNB closer to the middle?

Carsten.

 

[teryl]

If I understand right your main converter is pointed for 13 east. You have to make 28,2 or 23,5 converter in the center and than set up the others.

 

[eliosfederico]

If I understand right your main converter is pointed for 13 east. You have to make 28,2 or 23,5 converter in the center and than set up the others.

In the middle there's the 19.2.

 

[csell]

Hi.

19.2E in the middle is OK, or if you want 28.2E closer to the middle due to the change of SAT then choose 23.5E in the middle.
When you start to readjust all 4 LNB then start with the one in the middle. When you then adjust the next LNB can you turn the multiblock up or down until the elevation is correct.

Carsten.

 

[eliosfederico]

Hi.

On the Picture I can't se if your Triax Multiblock is strait and level, it should not be level.

The Multiblock is mounted by a screw trough a small hole in one side of the aluminium profile.

On mine I had to twist the aluminium profile around to be able to turn it so it is high in one side and low in the other side.


I checked the elevation on Dishpointer for your 4 satellites:

Elevation for Spain: 43.7° - 41.3° - 39.2° - 36.7°

Elevation for Netherland: 30.1° - 29.0° - 28.0° - 26.6°

Your difference in elevation is only half of the difference in elevation for Spain so you only have to turn the Multiblock half as much as I did. But the Multiblock have to be turned down in one side and up in the other for best signal.

As I remember, did I do a lot of small ajustment in the days after I mounted it. I could not get everything adjusted as I wanted. I did a lot of small compromices. And suddently all 5 LNB worked.

Next month will there be a change of satellite at 28.2E. From Astra 1N to Astra 2E. The Astra 2E UK beam will be narrower. May be you will want to move the 28.2E LNB closer to the middle?

Carsten.

Hi Carsten,
What do you mean with change of satellite?
Today I will try to "play" with the rail and if that doesn't help I'll try to move the lnb's like I saw on another picture.

 

[csell]

Hi again.

There will come a change of satellite in November. The old ones have beams for England and the surroundig countries and other beams for Europe. The new one Astra 2E was launced two week ago and is for the moment moving to 43.5 east for testing.

After the testing will it be moved to 28.2 and the old one will be used on an another position. The new 2E has as its
cousin 2F a very narrow spot beam for England only. I don't know where in the Netherlands you live, but I am not sure
you will be able to recieve the Chanels aimed for England any more. Or at least you will receive a weaker signal.


One week ago there was an another change on frequencies due to a legal battle between SES Astra and Eutelsat

http://www.sat-universe.com/showthread.php?p=1070630#post1070630

But that are solved now and have notting to do with the comming change.

To Novenber quite a lot of people in Europe will loose many of the channels from 28.2 I don't know how it will affect you.

Carsten.

 

[eliosfederico]

Thank you for your clear explanation. I have right now high signal on 28.2 (around 95%) so I hope I'll not lose I'll post as soon as Ill finish working on the lnb's

 

[eliosfederico]

P.S.: Is there a software or a website where I can calculate the exact distance between the LNB's?

 

[csell]

Hi.

You can se it for some satellites in the Triax Multiblock manual, I am sorry, but Triax don't have it online any more. But don't you have a paper copy?

Carsten.