does anyone know what type of dish this is?

[theblueirish]

can anyone help identifing this dish and lnb?

[snakie]

For me it looks like a homemade structure, fiberglass dish taken by another one used as mole, the back side is clearly homemade,even the polar mount.
The lnb could be any without the plastic cover,definately an offset one used on the prime focus.

[theblueirish]

thanks snakie,

i have to replace the lnb, dont want to buy the wrong one

[snakie]

well , for max efficiency you should use a flange one.
If you are interested for fringe reception also then use an invacom with 4 outputs, its more sensitive than the single one.
We use them in cyprus on 2.4 meter dishes for Astra 28.2 ;)

[folkie]

Sorry, I can't say what dish it is from your photo. It looks from the picture like a prime focus, that is that the feed is in line with the dish, unlike an offset where it is offset.

For a prime focus, the make of dish is not important. If the block connects via a C120 flange, then it is only necessary to change the LNB, keeping the original feed as it is. If they are combined, which that looks like, then for the best results, you need a prime focus lnb to match the f/D of your dish, and one to fit the same diameter clamp.

That is (The Focal length of the dish/the diameter). The focal length is the distance from middle of the dish to the focal point inside the feed. Some blocks mark it in a similar way that some cameras mark the focal point, but it is pretty rare. The D is the dishes diameter. You then go for as low a noise figure as you can afford.

Having a LNB with the wrong f/D does not stop it working, just makes it less efficient, as it either "illuminates" a smaller part of the dish, giving you effectivey a smaller dish size, or you get "spillover" which worsens your noise figure.

For offsets, most go for a standard f/D ratio, so the same blocks work on any size of dish, but they are really designed to work with offsets and not prime focus.

folkie