Post by Admin1 on Nov 25th, 2015 at 12:16pm
I think this is the C band Africa coverage from ABS-2 satellite, otherwise known as ST 3, Koreasat 8, Condosat 2 and located at 75 deg east orbit longitude.
Note linear polarisation. If you are using a circular polarisation feed you will have the OMT attached to the polariser at 45 deg. If you want to change such a system to linear polarisation, either remove the polariser or rotate the OMT by 45 deg so that the planes of linear polarisation in the OMT line up with the pins or slots in the polariser - so it is no longer 45 deg offset. The polariser then appears invisible. You will need to accurately rotate the feed system,+/- 1 deg, to minimise cross-pol interference.
Note linear polarisation. If you are using a circular polarisation feed you will have the OMT attached to the polariser at 45 deg. If you want to change such a system to linear polarisation, either remove the polariser or rotate the OMT by 45 deg so that the planes of linear polarisation in the OMT line up with the pins or slots in the polariser - so it is no longer 45 deg offset. The polariser then appears invisible. You will need to accurately rotate the feed system,+/- 1 deg, to minimise cross-pol interference.