ESTeem 195C, Руководство пользователя, Страница: 62 / 75

APPENDIX D
FCC/DOC INFORMATION
Revised: 15 Feb 2017 APX D-2 ESTeem Models 195MHC
Max Power Density Calculation
(Numerical power gain divided by the spherical area around the separation distance)
Pd = (P * N) / ( 4 * Pi * D² )
Example: The 195M has a maximum conducted output power close to 7 Watts. The highest gain antenna EST currently
offers for use with this modem is specified with a gain factor of 8 dBd ( 10.15 dBi ). Therefore, ignoring cable and connector
losses, the maximum power density for the specified minimum safe separation distance of 170 cm (uncontrolled
environments):
Pd = (7000 * 10.351 ) / ( 4 * 3.14 * 170 * 170) = 0.198 mW/cm² = 1.98 W/m²
Please contact EST technical support if you need assistance with calculations for various power levels, antennas and minimum
safe separation distances.
Terms
P = RF Power milliwatts
Gi = Antenna gain relative to isotropic = Gd + 2.15
Gd = Antenna gain relative to dipole = Gi ‐ 2.15
N = Numerical gain of antenna
D = Distance in centimeters
Pd = Power density in mW/cm²
North American Power Density Limits
FCC Part 47 Section 1.1309 Limits (Controlled Environments / Occupational Exposure)
150 ‐ 220 MHz (195M & 195H) 1 mW/cm²
450 MHz (195C) 1.5 mW/cm²
FCC Part 47 Section 1.1309 Limits (General Population / Uncontrolled exposure)
150 ‐ 220 MHz (195M & 195H) 0.2 mW/cm²
450 MHz (195C) 0.3 mW/cm²
Canadian Safety Code 6 Limits (Controlled Environments)
150 ‐ 174 MHz (195M) 10 W/m²
450 MHz (195C) 15 W/m²
Canadian
Safety Code 6 Limits (Uncontrolled Environments)
150 ‐ 174 MHz (195M) 2 W/m²
450 MHz (195C) 3 W/m²