The BN mount is a saddle clamp that is adjustable in azimuth and tilt. The tilt should be set to zero degrees and the azimuth to the required direction.
Note
Note: The hardware supplied for pole mounting and adjustment have a pre-applied anti-seize, dry film coating. There is no need to apply anti-seize lubricant to these fasteners.
Note
The hardware supplied for pole mounting and adjustment have a pre-applied anti-seize, dry film coating. There is no need to apply anti-seize lubricant to these fasteners. The maximum load on the lifting eye is 100 lbs. (45 Kg).
Measure the pole diameter to determine which length of M8 bolt to use to hold the BN bracket to the pole.
Note
The pole diameter listed below is Outside Diameter (O.D.) and not Nominal Diameter (N.D.)
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Use (4) M8 1.25 x 80 mm bolts for poles 60.3 mm – 101.6 mm (2 3/8” – 3 ½”).
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Use (4) M8 1.25 x 120 mm bolts for poles 101.6 mm – 127 mm (3 ½” – 5”).
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Measure Pole Diameter (95mm in this example)
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Install the BN bracket on the pole.
Note
There are slots for the bolt heads on both the bracket and the clamp.
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Insert the bolts on the right side of the clamp and thread on the nuts.
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Insert the bolts on the right side of the bracket and thread on the nuts.
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Gradually engage (4) bolts ensuring clamp halves stay parallel to each other and are spaced evenly on either side of the clamp.
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With the clamp in the final position, torque 4 bolts with incremental steps at approximately 40%, 70%, and 100% of full torque rating while ensuring the brackets stay parallel.
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Following the torque sequence 1-2-3-4 shown below, torque all bolts to values of approximately 40% (6 N-m/ 4.4 lb.-ft).
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Continue with the same sequence for all bolts at approximately 70% (10 N-m/ 7.4 lb.-ft).
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Repeat the torque sequence for all bolts until each bolt is stabilized at 15 N-m/ 11 lb.-ft).
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When installing the BN bracket to the pole before attaching the BN to the bracket (recommended), register the tilt adjustment to the upper limit. This ensures that the flange ears where the BN will be attached are aligned properly. Snug the tilt-adjustment bolts enough to hold bracket ears firmly while mounting the BN.
Figure 6: Twisted Brack Ears
Figure 7: Aligned Ears in High-Tilt Position
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Install 2 M8 x 25mm bolts with wedge lock washers in the top holes on the back of the BN as shown below. Partially thread the bolts into the chassis halfway (~12mm). This will provide a sufficient gap for the bolt heads and washer to slide into the top slots on the bracket ears.
The BN must be slid into the top slots on the bracket ears using these two bolts.
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Slide the BN into the top slots in the bracket ears using the partially-installed bolts from Step 1. Ensure that the wedge lock washers are on the outside of the bracket and not between the BN and the bracket.
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Install 2 M8 x 25 mm bolts with wedge lock washers in the two remaining lower slots one the bracket ears. Ensure that the wedge lock washers are on the outside of the bracket and NOT between the BN and the bracket.
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Torque all 4 of these bolts using the same torque sequence demonstrated earlier.
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With the clamp in the final position, torque the 4 bolts with incremental steps at approximately 40%, 70%, and 100% of full torque rating.
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Following the torque sequence shown, torque all bolts to values of approximately 40% (6 N-m/ 4.4 lb.-ft).
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Continue with the same sequence for all bolts at approximately 70% (10 N-m/ 7.4 lb.-ft).
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Repeat the torque sequence for all bolts until each bolt is stabilized at 15 N-m/ 11 lb.-ft.
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The BN has a 90-degree field of view. The azimuth should be adjusted as appropriate to the network design.
Note
The azimuth must be set and torqued before the tilt. If done in reverse, there is a good chance that the torque setting for the tilt will not be accurate. This can cause the mount to lose tilt adjustment after some temperature cycles or vibration. In turn, this will cause a tower climb and/or service disruptions.
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Adjust the azimuth by loosening 3 bolts on top of the bracket assembly as seen below. Torque the 3 M8 x 180mm in a gradual triangular pattern.
Note
The total adjustable azimuth is 60 degrees.
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Following a clockwise torque sequence, torque all bolts to values of approximately 40% (6 N-m/ 4.4 lb.-ft).
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Continue with the same sequence for all bolts at approximately 70% (10 N-m/ 7.4 lb.-ft).
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Repeat the torque sequence for all bolts until each bolt is stabilized at 15 N-m/ 11 lb.-ft.
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Adjust the tilt only after the azimuth has been adjusted.
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Adjust the tilt to the desired angle using a digital level with < 0.2-deg accuracy.
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Torque the 3 M8 x 180mm in a gradual triangular pattern.
Note
The total adjustable tilt is ±20 degrees.
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Torque the bolts in a clockwise pattern.
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Torque all bolts to values of approximately 40% (6 N-m/ 4.4 lb.-ft).
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Continue with the same sequence for all bolts at approximately 70% (10 N-m/ 7.4 lb.-ft).
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Repeat the torque sequence for all bolts until each bolt is stabilized at 15 N-m/ 11 lb.-ft.
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