User's Manual

AR24027 Operator’s Manual (rev A)
- 28 -
Once a potential receive channel has been identified using the spectrum analysis tool, a “timing
analysis” may also be used to confirm that the selected channel is indeed clear. The command:
>time-analysis channel=xx input=a-antenna dwell=xx
instructs the radio to dwell on the specified channel for the specified amount of time. After taking
several samples the radio displays the signal level detected in that channel over time.
4.3.5 Output Power Limits (FCC)
The Federal Communications Commission (FCC) regulations limit the maximum Effective Isotropic
Radiated Power (EIRP) for spread spectrum systems operating in the 2.4 GHz band. Close to the band
edges, the output power must be limited to avoid spilling over into the FCC protected band from
2.4835 GHz to 2.500 GHz. The table below takes these considerations into account and shows the
maximum allowed output power for the various antennas
Maximum Output Power (dBm)
Channel Frequency Antenna Gain
(MHz) 9 dBi 18 dBi 24 dBi
3 2406.0 23
4 2408.0 23
5 2410.0 23
6 2412.0 23
7 2414.0 23
8 to 30 23
31 2462.0 23
32 2464.0 23
33 2466.0 23
34 2468.0 22
35 2470.0 21
36 2472.0 20
37 2474.0 10
4.3.6 Output Power Limits (CE)
The European Telecommunications Standards Institute (ETSI) regulations impose a limit of 20 dBm
as the maximum Effective Isotropic Radiated Power (EIRP) for direct sequence spread spectrum
systems operating in the 2.4 GHz band. The installer must reduce the output power of the AR24027
so that this limit is not exceeded. The antenna gain, cable and connector losses must be taken into
account when computing the maximum output power.