User's Manual

605-0000-595 Subscriber Terminal Installation and Commissioning

Installing the IF Unit for External Antenna

Use this procedure to install the IF unit when attaching an external antenna (usually not

supplied by Airspan). These antennas are used when a) additional gain is required to

increase system range. or b) improved isolation to interference is required by narrowing

antenna beamwidths. The mounting pole is not an Airspan supplied item and the pole should

be manufactured to suit local requirements. Before installing the antenna check that the

proposed position meets the site selection guidelines.

Country Specific Requirements

USA: In the USA the antenna shall be installed in accordance with articles 725, 800, 810 and

820 of the National Electrical Code

Canada: In Canada the antenna shall be installed in accordance with section 54 of the

Canadian Electrical Code

External antenna specific requirements

Impedance = 50ohms

Outdoor unit connector type = N-type

VSWR (max) =1.5:1

Signal power (max) = 200mw

The IF unit mounting kit comprises:

IF Unit

Item Quantity

Pole Bracket 1

M6 x 50mm Bolts 4

M6 Coiled Washer 4

M6 Plain Washer 4

Rubber Boot 2

Cable Tie 3

IF Unit Positioning and Securing.

STEP PROCEDURE

1. Confirm the position of the antenna ensuring that there is no obstruction in front and

to either side.

2. When multiple STs are deployed at the same site the recommended minimum

spacing between each antenna is 1 metre.

3. The antenna mounting pole should be fixed so that antenna panning can take place

in the horizontal plane and check that line of sight with CT antenna does not breach

the deployment rules. The antenna mounting pole is locally provided and should be

38mm or 1.5" in diameter. The pole should be fixed according to the pole

manufacturers’ instructions.

4. Note: Leave adequate clearance around the antenna assembly to allow for the full

adjustment range when aligning the antenna.

5. Secure the IF unit to the mounting bracket using the pole bracket secured by four

M6*50mm hex head set screws, 6mm flat, and 6mm coiled washers as shown in the

figure below. Tighten the set screws to a torque of 1.75Nm