Chapter 4: Legal and regulatory information
Compliance with safety standards
Page 4-23
Table 138 Minimum safe distances for PTP 670 at maximum transmitter power
Antenna
P (W)
(*1)
G
(*2)
S (W/m
2
)
d (m)
(*3)
Parabolic 6 ft (38.1 dBi)
0.635
5248.1
10
5.15
Parabolic 4 ft (35.3 dBi)
0.635
3388.4
10
3.73
Flat plate 2 ft (28.5 dBi)
0.635
575.4
10
1.71
Integrated (21.0 dBi)
0.635
125.9
10
0.80
Sectorized (17.0 dBi)
0.635
40.7
10
0.45
Omni (13.0 dBi)
0.635
16.2
10
0.29
(*1) P: maximum average transmit power capability of the radio (Watt)
capacité de puissance d'émission moyenne maximale de la radio (Watt)
(*2) G: total transmit gain as a factor, converted from dB, including 0.9 dB cable loss for
connectorised antennas
gain total d'émission, converti à partir de la valeur en dB prenant en compte une perte de
0.9 dB correspondant aux câbles de connexion nécessaire pour les antennes externes
(*3) d: minimum distance from the antenna (meters)
distance minimale de source ponctuelle (en mètres)
Note
Gain of antenna in dBi = 10*log(G).
The regulations require that the power used for the calculations is the maximum
power in the transmit burst subject to allowance for source-based time-averaging.
Remarque
Gain de l'antenne en dBi = 10*log(G).
Les règlements exigent que la puissance utilisée pour les calculs soit la puissance
maximale de la rafale de transmission soumis à une réduction pour prendre en
compte le rapport cyclique pour les signaux modulés dans le temps.
Minimum separation distances for other transmitter powers, antenna
gains and power densities
The minimum separation distances can be calculated for any transmit power or antenna gain
using the formula provided in
In many deployments, the antenna gains will be lower than the maximum listed in
and the transmitter power will be reduced to comply with applicable regulations; in such cases,
the minimum separation distances will be significantly reduced compared with the results in
