ETS-Lindgren 2171B Boresight Antenna Tower - Manual (Page 45)

Additional Installation and Adjustments | 45
Install Non-Boresight Links and Level Carrier (2171B Only)
Never operate the Model 2171B with boresight and non-boresight links installed at the same time.
I NSTALL N ON -B ORESIGHT L INKS
If installed, remove boresight links.
Install non-boresight links in the non-boresight
locations on the carrier.
To adjust the horizontal level up or down, loosen
the inner middle knob and then rotate the outer
middle knob. Retighten inner knob to set
L EVEL C ARRIER
Place a level gauge on the mounting section of the carrier. Tighten all knobs on the non-boresight links. Do not overtighten.