High Power Product Antennas
Tropos Mobile Router Installation Guide
21
High Power Product Antennas
The information in this section applies to the following Tropos router model:
43102100—Tropos mobile router for FCC markets (802.11b/g 2.4 GHz)
Table 8
lists antenna configurations.
Note
CANADA ONLY:
This device has been designed to operate with the antennas listed in
Table 8
, and
having a maximum gain of 12dBi. Antennas not included in this list or having a gain greater than 12dBi
are strictly prohibited for use with this device. The required antenna impedance is 50 ohms.
To reduce potential radio interference to other users, the antenna type and its gain should be so
chosen that the Effective Isotropic Radiated Power (EIRP) is not more than that permitted for
successful communication.
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 formulas to compute the required
attenuation level:
Gain’ (dBi) = Antenna Gain (dBi) - Cable Loss (dB)
802.11b/g:
Table 8 802.11b/g Antenna Configurations (2400-2483 MHz)
Antenna
Ordering Number
Measured
Cond. Avg.
Power (dBm)
Tx
Attenuation
Software
Setting (dB)
Approximate
EIRP (dBm)
7.4dBi omni, unit mounted
AN074090
AN074091
AN074095
28.6
0
36
5.0dBi omni antenna, external
mounting
AN050024
AN050090
AN050091
AN050095
28.6
0
33.6
Tx Antenna Setting (dB) =
0
Gain’ - 7
if Gain’ < 7 dBi
if Gain’ > 7dBi
