User Manual

8
Max Antenna Gain / Output Power
NOTE:
All of the Locus Inc. approved antennas meet this Point -to-Point antenna gain / output
power emissions requirement. For a list of the antennas approved by Locus, Inc. for use
with its OverAir Solutions OS2400 module, see See “MANUFACTURER -APPROVED
ANTENNAS” on page 14.
The FCC transmitter power limit for this type of radio is 30 dBm (or 1 watt). In addition,
to ensure safety, the output of this module is limited to 250mW. To meet the FCC
requirements for emissions, the following restrictions on antenna gain must be adhered
to when establishing a radio network.
Point-Multipoint network:
max power 250 mW / max antenna gain 12 dBi
?? The transmitter power reference for a Point -Multipoint network is 30 dBm (1 watt) of
output power with a maximum antenna gain of 6 dBi.
?? For each 1 dB decrease of output power below this reference point, the antenna
gain can increase by 1 dB.
?? The OS2400 radio module has a maximum output power of 250 mW or 24 dBm.
Therefore, the maximum allowable antenna gain at full output power is 12 dBi in a
Point-Multipoint application.
(30dBm -24dBm) + 6dBi = 12dBi
Point-Point network:
max power 250 mW / max antenna gain 24 dBi
?? The transmitter power reference for a Point -to-Point network is 30dBm (1 watt) of
output power with an antenna gain of 6dBi. F or each 1 dB decrease in output
power below this reference point, the antenna gain can increase by 3 dB.
?? With the OS2400 radio module’s maximum output power of 250 mW, the maximum
allowable antenna gain is 24 dBi in a Point -to-Point application.
(30dBm - 24dBm) + (6dBi * 3) = 24dB