Triax Multi LNB Holder

[iandoh]

Trying to configure one of these but not really sure which direction the dish is meant to be? Am I meant to put an LNB as close to the centre and then align the dish to that sat, then adjust the rest? Or do I point the dish at some central location and adjust the LNBs accordingly?

 

[ozumo]

The best way I found was to install a long neck LNB in the dish's original holder and then hang the whole bracket from that LNB (using one of the bracket's holders, the central mount thing isn't needed). Then align the dish as usual on a satellite, then align offset LNBs by skewing the bracket around the main LNB and moving them along the rail.

 

[RimaNTSS]

do I point the dish at some central location and adjust the LNBs accordingly?

I think it is more proper way to adjust. Just place one LNB dead-centered, point dish to satellite and afterwards adjust rest of the LNBs.

 

[iandoh]

ust place one LNB dead-centered, point dish to satel

So this is what I've been trying all day, 13E on the centre, 19e is on the far right. The problem I have is that when I try to adjust the 19e one and adjust the level on the bar, it ruins the signal on the other side and vice versa. I'm guessing there should be a compromise but it's either all signal on one side and none on the other.

 

[RimaNTSS]

No compromises.... when you adjust one LNB to the maximum signal it should stay at the same level, independent of what you do with other LNBs.

 

[LeBelge]

Am I meant to put an LNB as close to the centre and then align the dish to that sat, then adjust the rest?

Yes, this is the most correct way of doing it.
But I don't like that holder.
I prefer this one:



from here

https://www.amazon.de/-/en/PremiumX-Multifeed-adjustable-sidewards-multi-feed/dp/B0052AUSZK/?_encoding=UTF8&pd_rd_w=OIn6b&content-id=amzn1.sym.bbd68511-6819-46d4-a811-fd711ee0e36e&pf_rd_p=bbd68511-6819-46d4-a811-fd711ee0e36e&pf_rd_r=QQSCBTRMYP5S08QWGJ7A&pd_rd_wg=X2a2Q&pd_rd_r=6f7554af-c0e6-4395-8b1c-f379a99d38b0&ref_=pd_gw_ci_mcx_mr_hp_atf_m&th=1

how it works:

Advice Needed - Muti LNB Holder

Hi, I'm looking for a multi lnb holder, ideally I want to attach 5 lnbs to a 1.1m dish. I have seen the above. Does anyone know whether this one would require me to screw it on to the LNB arm? Alternatively, if anyone has a recommendation for one that I can purchase from/be shipped to the UK...

www.satellites.co.uk

 

[iandoh]

No compromises.... when you adjust one LNB to the maximum signal it should stay at the same level, independent of what you do with other LNBs.

But I have to move the bar mount in order to get a signal on the other LNBs on the other side

 

[RimaNTSS]

I have to move the bar mount

Move it once (give right scew) and do not change its position after.

 

[iandoh]

Move it once (give right scew) and do not change its position after.

Right but the problem with this is that I never get signal with one side if I do that... It's been driving me insane all day and I didn't think I'm doing it wrong but I can't work out the problem. The only way to get the signal to be good on one side is to make the other side bad

 

[RimaNTSS]

I prefer this one:

Or something like I made another day

The only way to get the signal to be good on one side is to make the other side bad

Yes, and no, there should be one position of the bar when signal on both sides is maximum. But, of course, it is much easier to adjust antenna when all LNBs can be adjusted independently, like on my picture.

 

[LeBelge]

But I have to move the bar mount in order to get a signal on the other LNBs on the other side

you need to achieve such an effect



but for the holder itself

=======

What are the 4 satellites
13°E - 19°E and the 2 others ?

 

[LeBelge]

Or something like I made another day View attachment 147880

If I see one ( like this ) for sale on amazon I will buy it.

 

[jeallen01]

I must admit that I came to the conclusion that the types with curved bars (per post # 6 or these) were best because they compensated for the differences in the distances between the LNBs and the dish face that happens with the ones with straight bars.

& definitely get ones that have the main LNB on the focus axis of the dish - when that's aligned correctly you have a good indication that you know which "centre" sat the dish is pointing at!

 

[ozumo]

So this is what I've been trying all day, 13E on the centre, 19e is on the far right. The problem I have is that when I try to adjust the 19e one and adjust the level on the bar, it ruins the signal on the other side and vice versa. I'm guessing there should be a compromise but it's either all signal on one side and none on the other.

I think, because the bar is pivoting below the main LNB, one side will be too high and the other too low. Reinstalling the dish's original LNB holder and hanging the bar from the main LNB yields better results for me with this type of multi-LNB rail.

 

[RimaNTSS]

the types with curved bars

Actually, one from post #10 also has curved bar But, in addition, each separate LNB-holder has possibility to be adjusted in all (I mean all, including closer/further from dish) directions. Plus, the bar itself also can be pivoted.

 

[a33]

Right but the problem with this is that I never get signal with one side if I do that... It's been driving me insane all day and I didn't think I'm doing it wrong but I can't work out the problem. The only way to get the signal to be good on one side is to make the other side bad

With a 'horizontally' straight rail, the trick is to set the multifeed rail skew 'perfect' for the two outer satellites (19E and 5E), and take the slight misalignment for 13E and 9E for granted.
Procedure, assuming you have set the proper distance between the LNB holders on the rail already:

1. Align dish for 13E, the (about) central satellite.
2. Set elevation of the dish a tiny tiny bit lower, already. (You may or may not do this step.)
3. Find 19E, by adjusting the rail skew. For your location, the rail skew would be about 10.5 degrees against the horizontal, when looking in the same direction as the LNBs.
4. Now check by adjusting the rail skew, if for finding 5E, you have to move the multifeed rail at the 5E LNB higher, or lower, to get good reception.
5. If higher, set dish elevation a bit lower. If lower, set dish elevation a bit higher.
6. Repeat steps 3-4-5, untill step 4 needs no adjustment. (Only then, the combination rail skew and dish elevation is set as it should.)
7. Recheck the distances between the LNB holders on the rail.

Does this help?

Greetz,
A33

 

[rolfw]

Have installed quite a few of these, a33 is right, adjust the skew/tilt of the bar first, at least to approximately correct, then use the central sat bracket in such a way that it overlaps the holder to be all but central to the boom, align on that and the rest should pretty much drop into place, you will still need to adjust skew on individual LNBs, but not by much. Unfortunately, I can't find any images of some of the four sat ones I've installed, but I visited one recently to replace an LNB and all was still perfectly aligned.

 

[a33]

I forgot step 8:

8. If (and only if!) the central satellite(s) now have worse reception than the outer satellites (by the changed elevation since step 1), you might want to set the dish elevation a tiny tiny bit higher again, to a compromise position between the elevation of step 1 and that of step 5. (This might be needed, when the central satellite(s) is weak.)

But I think this step might not be needed with 13E central; though I don't know its footprint in Estonia.

Greetz,
A33

 

[Trust]

Right but the problem with this is that I never get signal with one side if I do that... It's been driving me insane all day and I didn't think I'm doing it wrong but I can't work out the problem. The only way to get the signal to be good on one side is to make the other side bad

What size is that dish ?
I see 3 lnb’s close together , maybe you need one with a smaller feedhorn in the middle of them .

 

[iandoh]

With a 'horizontally' straight rail, the trick is to set the multifeed rail skew 'perfect' for the two outer satellites (19E and 5E), and take the slight misalignment for 13E and 9E for granted.
Procedure, assuming you have set the proper distance between the LNB holders on the rail already:

1. Align dish for 13E, the (about) central satellite.
2. Set elevation of the dish a tiny tiny bit lower, already. (You may or may not do this step.)
3. Find 19E, by adjusting the rail skew. For your location, the rail skew would be about 10.5 degrees against the horizontal, when looking in the same direction as the LNBs.
4. Now check by adjusting the rail skew, if for finding 5E, you have to move the multifeed rail at the 5E LNB higher, or lower, to get good reception.
5. If higher, set dish elevation a bit lower. If lower, set dish elevation a bit higher.
6. Repeat steps 3-4-5, untill step 4 needs no adjustment. (Only then, the combination rail skew and dish elevation is set as it should.)
7. Recheck the distances between the LNB holders on the rail.

Does this help?

Greetz,
A33

Hi again everyone,

I tried a few of the suggestions on here last night but none of them were working as I expected, then this morning I saw this post and thought I'd give it another go with the directions.
Nailed it. Realigning the dish at 13E with the LNB on the right side allowed me to get 19e and 13e with optimial signal, along with 10E/9E & 5E at the end.
Signal's great across the arc now and I've secured it with the screws it came with and tightened the dish up.

Some photos of the final setup
The top dish is at 28e
Bottom dish 19e/13e/10e/9e/5e