10. Safety, environment, licensing
10.1. Frequency
The radio modem must be operated only in accordance with the valid frequency license issued by na-
tional frequency authority and all radio parameters have to be set exactly as listed.
Important
Use of frequencies between 406.0 and 406.1 MHz is worldwide-allocated only for Interna-
tional Satellite Search and Rescue System. These frequencies are used for distress beacons
and are incessantly monitored by the ground and satellite Cospas-Sarsat system. Other
use of these frequencies is forbidden.
10.2. Safety distance
Safety distances with respect to the US health limits of the electromagnetic field intensity
are in Minimum Safety Distance tables below, calculated for different antennas and
RipEX power levels. The distances were calculated according to EN 50 385 and
EN 50 383 and apply to the far-field region only. Whenever the result is comparable or
smaller than the actual size of the respective antenna, the field intensity is even smaller
than the far-field based calculation and the safety limit is never exceeded. For the output
power 0.2 W or lower the safety limit is not exceeded at any distance and any of the
antennas.
The minimal safe distance is typically ensured by the antenna position on a mast. When special install-
ation is required, the conditions of the standard EN 50385: 2002 have to be met. The distance between
the persons and antenna shown in the table bellow comply with all applicable standards for human
exposure of general public to RF electromagnetic fields.
Tab. 10.1: Minimum Safety Distance 160 MHz
160 MHz/2 m band – 10 W RF power
Dist. where the FCC limits are met for
Gain G
[–]
Gain G
[dBi]
Antenna description
Antenna
code
General Population
/ Controlled Expos-
ure [cm]
General Population
/ Uncontrolled Ex-
posure [cm]
90
190
2.9
4.6
single dipole
OV160.1
120
270
5.8
7.6
stacked double dipole
OV160.2
130
280
6.3
8.0
3 element directional Yagi
SA160.3
210
460
17.8
12.5
5 element directional Yagi
SA160.5
160 MHz/2 m band – 5 W RF power
Dist. where the FCC limits are met for
Gain G
[–]
Gain G
[dBi]
Antenna description
Antenna
code
General Population
/ Controlled Expos-
ure [cm]
General Population
/ Uncontrolled Ex-
posure [cm]
60
140
2.9
4.6
single dipole
OV160.1
RipEX Radio modem & Router – © RACOM s.r.o.
210
Safety, environment, licensing
Summary of Contents for RipEX
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