HELP! Satellite signal reflections from wall interfering?

[jooper]

I'm currently trying to point my dish, however I'm coming across a stubborn problem. I keep getting incomplete transponders for 91W. The incomplete transponders are consistent even with new cable, different dish and LNB. They also are random (odd and even) and a larger number in the middle (e.g. TPs 10-14). I get approx. 19 transponders, and missing about 13.

On average my signal level is about 80-83, and quality is 98 stable. This is very consistent and does not jump around. I'm also quite sure the dish is pointed correctly and peaked to the best of my ability (the same dish can also get 101W, 110W, and 119W with incredible signal level and quality when repositioned).

I'm stumped - can anybody offer me some advice? The only thing different about pointing it to 91W is that the dish is approx. only 10-15deg away from being perpendicular to a large brick wall. Would I be getting reflections of the signal from the wall that would confuse the receiver? All other birds that require the dish to point away (lie almost parallel) of the wall work well.

P.S. I have confirmed all the satellite TP, frequency, symbol rate, and polarization settings with lyngsat and satcodx. Everything was triple checked.

No amount of tweaking dish pointing for the problem TPs would help.

Haven't changed the freq. though. I don't think that would have changed on the sat.

[jooper]

Forgot to mention that I am using an 18" offset dish. My location should be more favourable for 91W reception too compared to the others

[bobkat]

What kind of receiver are you using? I gather you are aiming at Nimiq 91; its a pretty strong bird so you should have no problem pulling it in. Having the dish perpendicular to a wall is not a problem - I have aligned dishes this way; I even sometimes have to "cheat" if the pan is too big so I lower the foot a bit and then compensate for elevation and skew - but that's irrelevant ... :roll:

Do you have no signal on these particular transponders or low signal? Are you sure you are on Nimiq 91 and not Nimiq 82? Nimiq 82 has only a certain number of transponders active.

Another thing to watch out for - especially when you mount the dish perpendicular to a wall - is that the roof soffit (overhang) does not block the signal. I've screwed up this way before and had to relocate the dish. Its tricky.

kat