Horizontal dish.

[Choofie McSausage]

I need to move my dish because of tree growth blocking my signal. In the new location that I would like to put the dish it would be easier for me to have the pole horizontally, meaning that the LNB feed arm will be at the 3 o'clock position instead of at the bottom. Is this feasible?

 

[a33]

Hello Choofie,
Welcome to the forum!

Well yes, that is feasible.
But just as with a 'normally' mounted offset dish the signal comes from higher than the direction of the dish face,
the signal with a sideways (horizontally) mounted offset angle comes from more sideways than the direction of the dish face.

So it might be not easy, to find the correct azimuth for the dish.

Does this answer your question?

Greetz,
A33

 

[Terryl]

Depending on the design of the dish you could turn the dishes back side mounting bracket 90 degrees, (usually 4 bolts on the front of the dish) then it would be much easier to align the dish/LNB. This is only fees able if the mounting bracket holes are in a square pattern on the front side of the dish, can you post a photo of the front of the dish?

 

[Terryl]

Also mounting a dish sideways (90 degrees horizontal) may affect the polarity of the signals, they are horizontal and vertical polarity, the LNB may have to be turned 90 degrees to counter this problem, you would have to test this as turning it the wrong way would put the LNB 180 degrees out.

 

[Channel Hopper]

I need to move my dish because of tree growth blocking my signal. In the new location that I would like to put the dish it would be easier for me to have the pole horizontally, meaning that the LNB feed arm will be at the 3 o'clock position instead of at the bottom. Is this feasible?

Yes, I've done it plenty of times.

Mainly to move a dish around a corrner, but in some instances to lower the profile.

 

[Choofie McSausage]

Thanks for all the help. I'm going to give it a try and will tell you how I get on.

 

[a33]

Also mounting a dish sideways (90 degrees horizontal) may affect the polarity of the signals, they are horizontal and vertical polarity, the LNB may have to be turned 90 degrees to counter this problem, you would have to test this as turning it the wrong way would put the LNB 180 degrees out.

180 degrees out would be no problem of course. It is the 90 degrees wrong that would swap/mix-up the horizontal and vertical signals.

Apart from that: A skew of 0 degrees is always with the LNB cable downwards; no matter the orientation of the dish.

Greetz,
A33

 

[moonbase]

180 degrees out would be no problem of course. It is the 90 degrees wrong that would swap/mix-up the horizontal and vertical signals.

Apart from that: A skew of 0 degrees is always with the LNB cable downwards; no matter the orientation of the dish.

Greetz,
A33

In the case of the OP it sounds like he has an offset dish and possibly a Sky Zone 1/2 dish? I am not sure how much, if any, signal loss he would have by using the dish 90 degrees rotated from its intended orientation?
I suppose there might be a couple of factors coming into play, the difference between the height and the width of the dish and the type of LNBF in use? Has anyone ever tried a Sky Zone 1/2 dish 90 degrees rotated from normal?

In the case of a PF dish, it would not be impacted by whatever orientation the pole is.

 

[a33]

In the case of the OP it sounds like he has an offset dish and possibly a Sky Zone 1/2 dish? I am not sure how much, if any, signal loss he would have by using the dish 90 degrees rotated from its intended orientation?

For a normal (higher than wide) offset dish there would be no problem; that is what I meant to indicate. The LNB sees the dish (roughly) as a circle, no matter the dish's orientation.
[ A perfect circle, when aimed at the G-spot. A slightly elliptical circle, when aimed at the deepest point; which I believe is the better aiming point. ]

If it is indeed a wider than high offset dish, and it has a matched LNB feedhorn, there would be sort-of a problem.
With a normal feedhorn LNB, I don't see a real problem, considering the conclusion in this post:

Just Sharing This - Calculation of the focal length of an offset satellite dish antenna, Revisited

When you want to check or calculate the focal point position of your offset dish, the well known equation of John Legon (from his article Calculation of the focal length of an offset satellite dish antenna) might be handy. His formula for the focal length of a paraboloid offset dish is quite...

www.satellites.co.uk

A "normal" LNB would hardly see the outer parts of the greater width.

Greetz,
A33

 

[ozumo]

If it is indeed a wider than high offset dish, and it has a matched LNB feedhorn, there would be sort-of a problem.
With a normal feedhorn LNB, I don't see a real problem, considering the conclusion in this post:

Assuming it is a Sky Q wideband LNB then I don't think it matters if the dish & LNB is at 90° as the LNB has fixed horizontal & vertical outputs (no voltage or tone switching). The cables could just be swapped if the Q box doesn't automatically detect the polarities.

 

[Terryl]

With the signals 90 or 180 degrees out of normal, all you would have to do is turn the TV sideways or up-side-down...

 

[a33]

In the new location that I would like to put the dish it would be easier for me to have the pole horizontally, meaning that the LNB feed arm will be at the 3 o'clock position instead of at the bottom. Is this feasible?

Any progress?
Please report how it went, when possible with photos... :-)

Greetz,
A33

 

[Channel Hopper]

The o/p has not logged onto the site since November 8th.