Now I have altered the angle of the lnb so that it is now 90 degrees to the dish. I managed to get a lock onto the Astra 2d satellite, though the best I can get is 11% signal quality. A lot of fiddling about with the distance and skew of the lnb to the dish. I actually managed to get a number of channels with quite a good reception, though the reception is not consistent, as the lnb is not sitting firmly in place. I had to take one of the legs of the tripod mount away so that I could align the holder to sit 90 degrees to the dish!
A C120 flanged lnb and an adjustable c120 flanged feed horn is probably your best bet to illuminate the whole dish if it's a prime focus. |
Looks like I'm going to have to get one of those if I want to increase the signal strength. I can foresee a problem in how I set one of these up on the dish.
I mean the distances and angles have to be perfect. Any tips n tricks on how to set up a tripod mount for the lnb on the dish?
we use a laser in place of the LNB that fits the holders. |
I can see that would be very useful for alignment, but how do align the tripod mount so that the holder is perpendicular to the dish? How does one decide where to drill holes in the dish for the tripod mount? The spacings for the tripod mount on my dish are a bit suspect and don't look symetrical in relation to the distances between each leg and to the center point of the dish. A total home made bodge job!
Also with my dish, I assumed the focal length was 50cm, but I notice that the signal strength increased when I pushed the lnb nearer to the dish, though this would mean the lnb is not sitting at the focal point of the dish. The focal point would be at the neck of the lnb instead! So if the focal point is 50cm for my dish. Where should the lnb be in realation to the focal point? Just in front of the lnb, on the face of the lnb, just behind the lnb?
thanks again,
lloowen