Nortel Networks BTRCTR2400-T Benutzerhandbuch

1-10   BTR 2400 Release 1.1

411-1333-200   Preliminary   July 1998

Installation is performed in three separate operations:

•

adjusting antenna polarity

•

installing the tower equipment

•

installing the indoor equipment

The polarity of the transmit and receive signals at the antenna are separated 
by 90

°

. Polarity reversal is accomplished by separating the antenna from the 

radio and rotating 180

°

, as shown in Figures 1-8 and 1-9. Horizontal and 

vertical polarity are marked on the antenna. 

Adjust the BTR antenna’s polarity as follows:

Ensure that you adjust polarity at the base station prior to mounting the 
BTR 2400 to the pole.

Remember that you need to adjust the polarity and alignment of the 
associated CTR 2400s if you adjust the BTR 2400’s polarity and 
alignment.

1. Remove the eight (8) socket head cap screws (# 8-32 UNC) on the 

antenna flange. There are four on top and four on the bottom of the 
antenna flange. Remove the lock and flat washers. See Figures 1-3,          
1-4, 1-15 and 1-16.

2. Gently remove the antenna and turn it 180°.

3. Align the antenna with the two dowel pins that act as an index.

4. Place the flat washer against the antenna flange, followed by the lock 

washer and then the screw.

5. Use an Allen wrench # 8 to hard tighten the socket head cap screw to a 

maximum of 28 inch-pounds torque. 

6. Complete steps 4 and 5 for all eight socket head cap screws.

7. Ensure that the screw is inserted at the top of the antenna to prevent water 

entering the antenna. However, loosen it halfway. The bottom screw is 
removed to allow condensation to drain from the antenna. See Figure 1-3.