Calibrating ILS

[mlee]

Hi, could anyone please tell me why you need to calibrate either side of the ILS?
Regards

[glum]

To make sure the bit in the middle is where it should be.

[i am a bee too]

on the ground with a test set your checking the 90 and 180 hz signal which are the left right up down dots plus which is important the fail flags

[EI-MICK]

150HZ,sorry for being pedantic

[i am a bee too]

Sorry typo. You are correct.