User guide

Align Antennas

3-7

The RSSI connector provides an output voltage between 0 and 3.28 VDC that is

proportional to the received radio signal strength. The higher the voltage reading,

the stronger the signal. The radio signal from the remote antenna can be seen to

have a strong central main lobe and smaller side lobes. The object of the alignment

process is to set the antenna so that it is receiving the strongest signal from the

central main lobe.

To align the antennas in the link using the RSSI output voltage, start with one

antenna fixed and then perform the following procedure on the other antenna:

1. Remove the RSSI connector cover and connect a voltmeter using a cable with

a male BNC connector (not included).

Main Lobe

Maximum

Horizontal Scan

Vertical Scan

RSSI

Voltage

Side Lobe

Maximum

RSSI Voltage

Remote

Antenna

Maximum Signal Strength Position

for Horizontal Alignment

Maximum Signal

Strength Position for

Vertical Alignment

Voltmeter

RSSI BNC

Connection