EN-19
Recommended separation distances between portable and mobile RF communications equipment and the device.
The device is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customers or user can
help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications equipment
(transmitters) and the device as recommended below, according to the maximum output power of the communications equipment.
Rated maximum output power
of the transmitter (W)
Separation distance according to frequency of transmitter (m)
150 kHz to 80MHz
d
=1.2
P
80 MHz to 800 MHz
d
=1.2
P
800 MHz to 2.5 GHz
d
=2.3
P
0.01
0.12
0.12
0.23
0.1
0.38
0.38
0.73
1
1.2
1.2
2.3
10
3.8
3.8
7.3
100
12
12
23
For transmitters rated at a maximum output power not listed above, the recommended separation distance
d
in meters (m) can be estimated using
the equation applicable to the frequency of the transmitter. Where
P
is the maximum output power rating of the transmitter in watts (W) according to
the transmitter manufacturer.
Remarks 1: At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
Remarks 2: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures,
objects and people.
Field strengths from fixed RF transmitters as determined by an electromagnetic site survey
a)
, should be less
than the compliance level in each frequency range
b)
.
Interference may occur in the vicinity of equipment marked with the following symbol:
Note a) Field strength from fixed transmitters such as base stations for radio (cellular/cordless) telephone and land mobile radios, amateur radio,
AM and FM radio broadcast and TV broadcast cannot be predicted theoretically with accuracy. To assess the electromagnetic environment due to
fixed RF transmitters an electromagnetic site survey should be considered. If the measured field strength in the location in which the device is used
exceeds the applicable RF compliance level above the device should be observed to verify normal operation. If abnormal performance is observed,
additional measures may be necessary, such as re-orienting or relocating the device.
b) Over the frequency range 150 kHz and 80 MHz, field strengths should be less than 3V/m.
Table 1
– Test specifications for Enclosure port immunity to RF wireless communications equipment
Test
frequency
(MHz)
Band
(MHz)
Communication
service
Modulation
Maximum
power
(W)
Separation
distance
(m)
Immunity
test level
(V/m)
Compliance
(Compliance
level)
385
380 - 390
TETRA400
Pulse modulation
18 Hz
1.8
0.3
27
27
450
430 - 470
GMRS 460
FRS 460
Frequency modulation
※
±5 kHz deviation
1 kHz sine
2
0.3
28
28
710
704 - 787
LTE Band 13, 17
Pulse modulation
217 Hz
0.2
0.3
9
9
745
780
810
800 - 960
GSM 800/900 ,
TETRA 800,
iDEN 820 , CDMA
850, LTE Band 5
Pulse modulation
18 Hz
2
0.3
28
28
870
930
1720
1700 - 1990
GSM 1800, CDMA
1900, GSM 1900
DECT, LTE Band 1, 3,
4, 25, UMTS
Pulse modulation
217 Hz
2
0.3
28
28
1845
1970
2450
2400 - 2570
Bluetooth, WLAN
802.11 b/g/n, RFID
2450 LTE Band 7
Pulse modulation
217 Hz
2
0.3
28
28
5240
5100 - 5800
WLAN 802.11 a/n
Pulse modulation
217 Hz
0.2
0.3
9
9
5500
5785
※
As an alternative to frequency modulation, 50 % pulse modulation at 18 Hz may be used because while it does not represent actual modulation, it
would be worst case.
