In the Gold Coast the reception margin for Asia 5 on a 2.3m is above threshold. Is reception from any other TP stable ? say 3660 V or 4000H ? You may have a deaf tuner If non of the TP's are stable. If other TP come in good then incoming signal is poor.
If the the dish is motorized it may have not been set correctly. There're too few technician who know how to correctly set up H to H tracking.
Try another LNB,
Make sure there're no trees or other obstacles blocking the line of sight to the satellite.
Make sure the the LNB V/H orientation is correct.
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