LNB , how to know is dead?

[Loquacious]

And from the side.

Sorry for not replying sooner. ( holiday).
Let's update you all.
I managed to have a strong signal at 19.2 ( 80%) and some 45% on the 13.2.
So , I have a feeling that I loose signal on the start of spring period as the tree in front are getting bigger as the years passed but I also think there are some issues on the dish itself as some picture below will show.
I will try again ( if the weather permits) change a bit manually following your instructions.
Many thanks

 

[Mickha]

Your dish is offset, which means that the trees would have to be extremely high, to interfere with your signal.
A prime focus dish points directly at the satellite, as it refects the signal, from the satellite, to the centre of the dish, an offset dish doesn't point at the satellite, as the satellite beam hits the dish, from a higher orbit, and reflects at an offset angle, to the LNB.

If you went on dishpointer.com, located where your dish was, and selected Hotbird 13E, from the satellite drop down box, then moved the green icon, to that position, and checked the show obstacle box, moving the red icon to the trees, it would show the approximate height, the obstacle had to be, to cause interference. You then need to take into account the height, of your dish, from the ground.

Have you tried 23.5E, and 28.2E, yet? Have you got any obstacles to 0.8W?

 

[Loquacious]

Your dish is offset, which means that the trees would have to be extremely high, to interfere with your signal.
A prime focus dish points directly at the satellite, as it refects the signal, from the satellite, to the centre of the dish, an offset dish doesn't point at the satellite, as the satellite beam hits the dish, from a higher orbit, and reflects at an offset angle, to the LNB.

If you went on dishpointer.com, located where your dish was, and selected Hotbird 13E, from the satellite drop down box, then moved the green icon, to that position, and checked the show obstacle box, moving the red icon to the trees, it would show the approximate height, the obstacle had to be, to cause interference. You then need to take into account the height, of your dish, from the ground.

Have you tried 23.5E, and 28.2E, yet? Have you got any obstacles to 0.8W?

Hello Mickha, as you can see in the dish pointer I have a tree . The height I don't really know precisely but I guess is about 3 metres above my dish ( the dish is 4 metres from the ground ) in total it probably is around 8/9 metres tree.

 

[Mickha]

Does the tree belong to you?
The problem with trees, apart from blocking satellite signals, are the roots, as they grow further then the height of the tree, and can cause a lot of damage.
How far is the tree, from your dish?

 

[deeptho]

Your dish is offset, which means that the trees would have to be extremely high, to interfere with your signal.

An offset dish has exactly the same limitations as any other dish. Your dish is
high up a pole, and that makes it less likely that it will be blocked by trees.

A prime focus dish points directly at the satellite, as it refects the signal, from the satellite, to the centre of the dish, an offset dish doesn't point at the satellite, as the satellite beam hits the dish, from a higher orbit, and reflects at an offset angle, to the LNB.

If an offset dish does not point at the satellite then it does not receive the satellite.

If you went on dishpointer.com, located where your dish was, and selected Hotbird 13E, from the satellite drop down box, then moved the green icon, to that position, and checked the show obstacle box, moving the red icon to the trees, it would show the approximate height, the obstacle had to be, to cause interference. You then need to take into account the height, of your dish, from the ground.

Have you tried 23.5E, and 28.2E, yet? Have you got any obstacles to 0.8W?

The tree seems to be missed by the green line and then it would be ok. If it is only 4 meter higher than the dish, then it can be a problem only if it is less than 6 m away from the dish (for 13E according to your dish pointer image)

 

[Loquacious]

The tree is 17 metres away from the dish and the signals at 13.0E is increasing as the leaves are following down.

 

[John]

A fairly easy thing to do re: the tree obstruction worry to establish if indeed the tree was having a blocking effect would be to rest a ladder a few metres to the side of the dish so you could ideally be at or near to the height of the dish - with the aid of a straight edge, a 12" ruler or something a bit longer, and with care whilst working at heights safely 'sight' through from the bottom of the dish to the top of the lnb and follow the sight line through so as to include the tree or tree top position to see if indeed it does block the line of sight to the satellite if at all. ... see quick sketch - nothing to scale
Also re: arc tracking, looking at your installation pictures , obtaining good and properly aligned bracket fixings on a tiled surface has always been a pain to acheive, is it an optical illusion but is your vertical mounting pole truely plumb ?.
Good luck and work safe.

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[Captain Jack]

A fairly easy thing to do re: the tree obstruction worry to establish if indeed the tree was having a blocking effect would be to rest a ladder a few metres to the side of the dish so you could ideally be at or near to the height of the dish - with the aid of a straight edge, a 12" ruler or something a bit longer, and with care whilst working at heights safely 'sight' through from the bottom of the dish to the top of the lnb and follow the sight line through so as to include the tree or tree top position to see if indeed it does block the line of sight to the satellite if at all. ... see quick sketch - nothing to scale
Also re: arc tracking, looking at your installation pictures , obtaining good and properly aligned bracket fixings on a tiled surface has always been a pain to acheive, is it an optical illusion but is your vertical mounting pole truely plumb ?.
Good luck and work safe.

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View attachment 152457

A true artist.

 

[John]

A true artist.

Me or Rolf Harris

 

[Loquacious]

A true artist.

Thanks for taking time to draw a similar version of my best up dish. I will do it in a safe way. I will let you know what is the results.

 

[Mickha]

Have you tried any other satellites yet?
Particularly 23.5E, 28.2E, and 0.8W?
Posting signal quality levels, of satellites that have no obstructions, will help in discovering if your dish is tracking the satellite arc correctly.

 

[a33]

When there is a sunny day, this post might be a hint of what to try:

LNB , how to know is dead?

Hello I retrieved our conversation when I was trying to set up my dish/ motor back in 2017. Ah yes. Then the 7 degrees on your dish elevation scale is wrong; it should be Bend angle (usually 30/35/40 degrees) MINUS 6.74 degrees. SG2100 has 30 degrees tilt in motor axis I believe, so in your...

www.satellites.co.uk

I haven't checked how much lower the sun is than the clarke belt at the moment, but it might (still) give an indication about the line of sight.

It is a pity, that this check has not been done two weeks earlier...

Greetz,
A33

 

[scopus]

Me or Rolf Harris

Now then, now then..

 

[Channel Hopper]

Now then, now then..

Not his signature, but was available as a primary URL very recently.

 

[Loquacious]

Have you tried any other satellites yet?
Particularly 23.5E, 28.2E, and 0.8W?
Posting signal quality levels, of satellites that have no obstructions, will help in discovering if your dish is tracking the satellite arc correctly.

Good morning Mickha, As the weather was horrendous down south in the last days also today, I couldn't manage to go up and make the changes suggested on this thread. I will see if the weather improves this afternoon and tomorrow for starting again.
Anyway, I tried not scan satellites that you suggested but only some has been scanned as you can see in some pictures. Thanks

 

[Loquacious]

Good morning Mickha, As the weather was horrendous down south in the last days also today, I couldn't manage to go up and make the changes suggested on this thread. I will see if the weather improves this afternoon and tomorrow for starting again.
Anyway, I tried not scan satellites that you suggested but only some has been scanned as you can see in some pictures. ThanksView attachment 152513

23.5e and 0.8 w have not any signals whatsoever. Nor any in the the West sources.

 

[Mickha]

What signal quality readings, do you have, on Channel 4?
It looks like you're only scanning 1 transponder.
Try manually scanning some other transponders, you can find the details on lyngsat:

https://www.lyngsat.com/Astra-2E-2F-2G.html

 

[Loquacious]

Those are the dish position in my side wall. The trees are loosing leaves and you can see the gaps between branches as in summer it's full.

 

[Mickha]

Those trees are great for privacy, and noise abatement, but not for satellite reception.
Add to that the damage the roots could do, or if they are toppled, during storms.
Does the council own them, or are they on private land?

 

[Loquacious]

Those trees are great for privacy, and noise abatement, but not for satellite reception.
Add to that the damage the roots could do, or if they are toppled, during storms.
Does the council own them, or are they on private land?

Private land . It does mean, if it continues to grow, I have to put the dish up to the roof ( which is not wise considering the weather conditions down here at the sea town.)...