Are you saying you can receive C-Band from IS19 OK?
Do you get Ku signal readings from IS19 on your sat meter?
JCSAT4B and IS19 are almost completely opposite pointing directions from your location, so it's not a fair comparison.
Perhaps your Ku signal path to IS19 is obstructed... does your Ku dish have a perfectly clear view to IS19?
According to the IS19 footprints on Satbeams, your area is only covered by the SW Pacific beam.
Which IS19 transponder/s are you trying to receive?
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