© 2019 Garderos GmbH
18/23
tx-power max = 20dBm – (-0.3dB + 4dBi + 0dB) = 16.3dBm
Calculate maximum TX-power as described above and round down the value. Set
the TX-power on the router to that value to stay in the regulatory limits (16dBm in the
example above).
6.2.2 Safety distance
The router’s antennas should be installed in such a way that they are not accessible
for unauthorized persons. The following tables show the minimum safety distance
based on the harmonized EU standards EN 50385:2017 and EN 50383:2010, taking
into account the reference values of the Council recommendations 1999/519/EG:
Calculate the output power on the antenna from the configured TX-power on the
router and the total antenna gain:
Output power = Configured tx-power + Total antenna gain
Output power for the example above:
Output power = 16dBm + (-0.3dB + 4dBi + 0dB) = 19.7dBm
Round up the value (20dBm) and select the safety distance from the table below.
2.4GHz
5.5GHz
Output power
Safety dist.
Output power
Safety dist.
18dBi
2.2cm
18dBi
2.2cm
20dBi
2.8cm
20dBi
2.8cm
22dBi
3.6cm
22dBi
3.6cm
24dBi
4.5cm
24dBi
4.5cm
26dBi
5.7cm
26dBi
5.7cm
28dBi
7.2cm
28dBi
7.2cm
The default value for tx-power is set to 20dBm. If an antenna
with gain is used, the value must be set to a value from the
table above, to comply with the regulatory limitations. It is the
operator’s responsibility to comply with the regulatory
limitations.
