Prime Focus satellite Dishes

Prime focus dish illustration
(parabolic antenna) is a satellite antenna which is perfectly round. It is absolutely symmetric built and has a parabolic shape. The focal point is in the middle of the dish. That's why the LNB is mounted centrally at the focus, where it can collect all incoming signals. Such a satellite antenna is typically larger than 1.2 meters.

Look in the SatLex gallery for more pictures of Prime Focus dishes!
Advantages:

  • Because of its relatively large surface, the prime focus antenna is less sensitive to small directional deviations and there is a better chance of receiving signals outside the normal footprint. But on the other hand, because of the small beamwitdh (3dB) angle, the antenna has to be setup more accurate than a normal offset one.
Disdvantages:
  • Rain and snow can easily collect in the dish and could interfere with the signal.
  • Because of the LNB is mounted centrally, a lot of the incoming signals are blocked by the LNB on the way to the antenna surface. But if using only a Ku band feed, the shadow won't be that big as when using a C band feed.
Further forms of Prime Focus antennas are Mesh, Cassegrain and Gregory.
The Mesh dish is a special form of the Prime Focus Antenna. A Mesh dish is made up of some kind of reticule. Just like the normal PFA, a Mesh dish is being used for C band reception using an Egis rotor.
Look in the SatLex gallery for more pictures of Mesh dishes!
Itr 2010 stats at statscrop itr2010.
WSI WSI LNBF Collar KU2C3 for Prime Focus Dishes
Speakers (WSI)
  • Use it to mount an LNBF on a prime focus dish.
  • Good for holding KU or C-band LNBF in the focal point of the dish.
  • Accommodates LNBF neck sizes 25m and 40mm.

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