[rainman]

it is not unusual for the dish elevation to be off by 5 degrees my 90 cm was also off remember the calculated angles is only a starting point. the easiest way to make sure of how far you are moving the motor on the pole is to mark your starting point after each 1/16th of inch adjustment allow 15 to 20 seconds for the receiver to see the change if you are using it as the signal meter. also helpful to have the receiver and small TV at the dish so you can monitor the changes. as keebs said very slow movement a 1/8th inch can loose signal.