Advantech ADAM-4550 user manual Antenna Installation

2.8 Antenna Installation

Indoor communication distance is about 300 to 550 ft. using a standard 2 dB antenna. Howev- er, actual distance depends on environmental conditions as well as antenna type and position- ing.

Longer communication distances can be achieved by using an antenna with a higher gain. A table of communication ranges as a function of differing combinations of antennas (at the source and receiving ends) is displayed below.

Antenna	24 dB	18 dB	11 dB omni-
Gain at	directional	directional	directional
either end
24 dB	10 Km	5 Km	2 Km
directional
18 dB	5 Km	2.5 Km	1 Km
directional
11 dB omni-	2 Km	1 Km	0.5 Km
directional

Note : 1. While using directional antennas, care should be taken to install and adjust the anten- na‘s direction according to the instructions of the antenna’s manufacturer. Please see the example specification for an external 24 dBi an- tenna at appendix A.

2.A user’s license may be required to use a directional antenna. Please consult your local authority for local regulations.

3.We strongly recommend that you install ADAM-4550 as near as possible to its antenna. Where the antenna has to be located at a dis- tance from the ADAM, special RF cable is re- quired. Please see the example cable connec- tion arrangement in appendix B.

4.Omnidirectional antennas should be used when the ADAM-4550 communicates with more than one other ADAM-4550 unit located in dif- ferent directions.

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