Furuno FR-2115-B Installation Manual page 10

1.1.2 Assembling the antenna unit
The antenna unit consists of the antenna radiator and the antenna unit chassis, and they are
packed separately. Fasten the antenna radiator to the antenna unit chassis as follows:
1. For the XN20AF, XN24AF, attach two guide pins to the underside of the antenna radiator.
2. Remove the waveguide cap from the radiator bracket. The cap may be discarded.
3. Coat the waveguide flange with anticorrosive sealant as shown in Figure 1-1.
Hole for
a guide pin
Figure 1-1 Coating the waveguide flange with anticorrosive sealant
4. Coat fixing holes for the antenna radiator with anticorrosive sealant.
5. Grease the O-ring and set it to the O-ring groove of the radiator flange.
6. Set the antenna radiator to the radiator bracket.
7. For the XN20AF, XN24AF, coat hex bolts (M8X40, slotted washer-head, 8 pcs.) with
anticorrosive sealant and use them to loosely fasten the antenna radiator to the antenna unit
chassis. For the XN12AF, coat hex bolts, flat washers and spring washers with anticorrosive
sealant and use them to loosely fasten the antenna radiator to the antenna unit chassis.
8. For the XN20AF, XN24AF, remove two guide pins (inserted at step 1).
9. Tighten the bolts loosely fastened at step 7.
10 mm O-ring
5 mm
CAUTION
Be sure to remove the guide pins.
Injury may result if the guide pins loosen
and fall.
1-2
Anticorrosive sealant
Hole for
a guide pin