Post by Eric Johnston on Nov 27th, 2011 at 7:27pm
The good news is that you have found a satellite. Carefully measure and mark the angles so you can always get reliably back to this first found satellite. The other satellites are in a steeply sloping line up the sky. It is helpful to know this if you are not on AB1, but need to look at the next ones either way.
One important setting is the polarisation angle. This is the rotation of the LNB/BUC/Feed horn assembly in its yoke system in front of the antenna.
Read the information from your provider. It should say what is the name of your downlink polarisation - either Horizontal name or Vertical name.
Setting polarisation is two step process.
Step 1. Set the nominal named polarisation.
If name=vertical then turn the LNB/BUC/feed system so that the broad faces of the 2784H LNB rectangular input waveguide are on top and underneath.
like so:
Note that the half dipole pin inside the waveguide is Vertical. It does not matter up or down.
If name=horizontal then turn the LNB/BUC/feed system so that the broad faces of the 2784H LNB rectangular input waveguide are on either side.
like so:
Note that the half dipole pin inside the waveguide is Horizontal. It does not matter which side.
Step 2. Apply the polarisation adjustment angle.
See https://www.satsig.net/maps/satellite-tv-dish-pointing-caribbean.htm for your pointing and polarisation angles. Your polarisation adjustment amount is -80.5 deg. Minus means anticlockwise as viewed standing behind the dish and facing forwards toward the satellite in the sky.
In your case, you need to turn the feed system by an amount of 80.5 deg anti-clockwise, as viewed facing forwards towards the satellite in the sky.
If the application of the adjustment amount causes the LNB to hit the metal yoke base then start 180 deg the other way.
Best regards, Eric.
One important setting is the polarisation angle. This is the rotation of the LNB/BUC/Feed horn assembly in its yoke system in front of the antenna.
Read the information from your provider. It should say what is the name of your downlink polarisation - either Horizontal name or Vertical name.
Setting polarisation is two step process.
Step 1. Set the nominal named polarisation.
If name=vertical then turn the LNB/BUC/feed system so that the broad faces of the 2784H LNB rectangular input waveguide are on top and underneath.
like so:
Note that the half dipole pin inside the waveguide is Vertical. It does not matter up or down.
If name=horizontal then turn the LNB/BUC/feed system so that the broad faces of the 2784H LNB rectangular input waveguide are on either side.
like so:
Note that the half dipole pin inside the waveguide is Horizontal. It does not matter which side.
Step 2. Apply the polarisation adjustment angle.
See https://www.satsig.net/maps/satellite-tv-dish-pointing-caribbean.htm for your pointing and polarisation angles. Your polarisation adjustment amount is -80.5 deg. Minus means anticlockwise as viewed standing behind the dish and facing forwards toward the satellite in the sky.
In your case, you need to turn the feed system by an amount of 80.5 deg anti-clockwise, as viewed facing forwards towards the satellite in the sky.
If the application of the adjustment amount causes the LNB to hit the metal yoke base then start 180 deg the other way.
Best regards, Eric.