PHASE SHIFTER. THIS APPARATUS ENABLES THE USER TO ADJUST THE ANTENNA BEAM UP AND DOWN ELECTRICALLY IN ORDER TO STEER THE SIGNAL IN A PARTICULAR DIRECTION. IT IS SPECIALLY DESIGNED AND IS CRITICAL TO THE TILT FUNCTIONALITY OF THE ANTENNA. THE PHASE SHIFTER IS MADE UP OF THE FOLLOWING COMPONENTS: AN ALUMINIUM HOUSING, FIRE RATED (FR4) PCB, PTFE DIELECTRICS AND CABLES.

GIR 1 & 6. NOTE 2(b) TO SECTION XVI. THE TEXT TO CODES 8517 & 8517 70. THE HSEN TO HEADING 8517.