Maintenance Guide
Cobham Wireless
idDAS Installation and Maintenance Guide 00109GU Rev. 2.0
Page | IX
Equation for minimum distance for multiple bands:
R
Worst case scenario when all bands are active.
ANTENNA
GAIN
14dBi
11dBi
8dBi
5dBi
R- MINIMUM
DISTANCE
524.37 cm
371.22 cm
262.80 cm
186.05 cm
Minimum distances for multiple bands for several antennas
EMEA Standards
Safety:
EN 60950
-1
EN 60825
-1
EN 50385
General
General
General
EMC
EN 301 489
-1
EN 301
-489-5
EN 301 489-50
General
UHF/
TETRA
Cellular
Radio
EN 303 609
EN 302 561
EN 301 908
-1
EN 301 908
-11
EN 301 908-15
GSM
UHF
/TETRA
General 4G
3G
4G
Exposure to Electromagnetic Fields
Cobham Wireless Repeaters emit Radio Frequency signals which when connected to an antenna will produce an
electromagnetic field. The International Commission for Non- Ionising Radiation Protection (ICNIRP)have issued
guidelines that recommend the reference levels, which if adhered to, will provide maximum protection from adverse
health effects that may be caused by exposure to such fields
This equipment when correctly installed and commissioned will be fully compliant with the ICNIRP reference levels.
ICNIRP produce two sets of reference levels, one for occupational exposure and one for general public exposure. The
definition given of occupational exposure reference levels is that the individuals exposed will be aware of the potential
hazards, be trained to recognize such hazards and be able to take corrective action if required. This might apply to
trained RF engineers or antenna system installers but typically this equipment will be used in environments where
persons not specifically trained will be exposed to electromagnetic fields generated by the equipment. Therefore it is
recommended that when using this equipment the reference levels for exposure to the general public are used.
The reference levels are based on the Specific Energy Absorption Rate (SAR) that determines the heating effect a person
may experience as a result of exposure to electromagnetic fields. The heating effect varies with the radio frequency as
the SAR varies depending on the frequencies used.
The reference levels relevant to the frequencies used in this equipment are reproduced below:
The reference levels relevant to the frequencies used in this equipment are reproduced below:
FREQUENCY
RANGE
E-FIELD
STRENGTH
(V M
-1
)
H-FIELD
STRENGTH
(V M
-1
)
B-FIELD
(
μ
T)
EQUIVALENT PLANE
WAVE POWER DENSITY
S
EQ
(WM
-2
)
10
– 400 MHz 28 0.073 0.092 2
400
– 2,000 MHz
1.375
f
1/2
0.0037
f
1/2
0.0046
f
1/2
f/
200
2
– 300 GHz 61 0.16 0.20 10