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RF Products Crestron Best Practices

Site Survey Tasks

NOTE: Wi-Spy 2.4x is used as the site survey tool for the examples in this section.

In addition, a site survey on the 2.4 GHz band is demonstrated because it often has

many more problems than any other band. If your tool supports 5.8 GHz, you can

perform the same site survey tasks as performed on the 2.4 GHz band.

To perform a site survey:

1. Shut down all Crestron RF devices to prevent them from being detected and

interpreted as outside interference.

2. Place the detecting equipment in a location where the wireless equipment is

to be used.

3. Take a reading that is at least five minutes long to capture enough data.

During the reading, turn on all electrical equipment in the vicinity,

including TVs and any microwave ovens (make sure you put something in

the microwave oven first!). Also, if there are cordless phones present, call

the lines and pick up the phones to activate them. Most cordless phone

interference is created when the phones ring and the lines are active.

4. If the wireless equipment is to be used in a room greater than 1,000 square

feet, repeat steps 2 and 3 in various locations within the room.

5. If the wireless equipment is to be used in multiple rooms, repeat steps 1

through 4 in each room.

When the reading has completed, Chanalyzer shows the results in a clean and easy-

to-read view of the signal over the entire 2.4 GHz band as shown in the following

example.

Sample Chanalyzer Capture of RF Interference

In the graph above, the range of wireless signals is roughly -110 dBm up to -20 dBm

(-20 dBm indicates a very strong signal). A good rule of thumb to follow is that if

almost all of the signal is below -80 dBm, the channel is good.

8 • Best Practices – RF Products Reference Guide – DOC. 6689C

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Crestron CNRFGWX Especificações Página 12