High Power Product Antennas
Tropos 5210 MetroMesh Router Installation Guide
59
Attenuation with External Antennas
If external antennas are used, it is necessary to adjust the transmit power attenuation to provide
the correct power level for the router. Use the following formula to compute the required
attenuation level:
Attenuation setting = Antenna gain (dBi) - 7.4 dBi - Cable loss
The attenuation setting cannot be negative; therefore, a positive attenuation setting is only
required if the antenna gain is greater than 7.4dBi.
Table 15
shows the proper attenuation
settings, assuming that low-loss cable is used (1dBi). The attenuation should be rounded to the
nearest half-integer value.
Table 15 Gain and Attenuation
Model Number Antenna Gain
Tx Attenuation
Setting (dB):
Peak
Conducted
Power
EIRP
AN074077
7.4dBi, omni
0
28dBm
35.4dBm
AN074088
7.4dBi, omni
0
28dBm
35.4dBm
AN100022
9.9dBi, omni
2
26dBm
35.9dBm
AN120022
12.0dBi, directional
4
24dBm
36.0dBm