Firstly, 'roughly' in the right direction doesn't cut it. You must be 100% accurate with alignment.
IS19 is much lower to the horizon than the Optus sats, so with the dish on the ground, there may ne obstructions in the signal path.
Go to enter your address and select IS19. It shows your location using Google Earth.
Drag the marker to where your dish is.
It will show you an approximate direction to point the dish.
Optus satellites have a different LNB skew compared to other sats.
From Melbourne, the output connectors of your LNB for Optus sats are probably somewhere between the 6-7 o'clock position when viewed from the front of the dish.
For IS19 (and other non-Optus sats) the LNB position will be around the 5-6 o'clock position when viewed from the front of the dish.
Get the LNB skew roughly right before attempting to align the dish.
The mount for the dish also needs to be plumb, because if it isn't the dish and the LNB will tilt when you turn the dish, which will alter the receiving signal pattern and LNB skew.
TP 12557 V is encrypted.
You MUST watch a signal screen when performing alignment and skew adjustment.
Blindscan will not find anything until you have accurately aligned the dish.
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