15
a. Field strengths from fixed transmitters, such as base stations for radio
(cellular/cordless) telephones 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
this device is used exceeds the applicable RF compliance level above,
this device should be observed to verify normal operation. If abnormal
performance is observed, additional measures may be necessary, such
as re-orienting or relocating this device.
b.
than 3V/m.
Recommended separation distance between portable and mobile RF
communications equipment and the device
This device is intended for use in an electromagnetic in which radiated RF disturbances
are controlled. The customer or the user of this device help prevent electromagnetic
interference by maintaining a minimum distance between portable and mobile RF
communications equipment (transmitters) and this device as recommended below,
according to the maximum output power of the communications equipment.
Rated maximum
output power of
transmitter
W
Separation distance according to frequency of transmitter
M
150 kHz to 80 MHz
d =
80 MHz to 800 MHz
d =
800 MHz to 2.5 GHz
d =
0.01
N/A
0.12
0.23
0.1
N/A
0.38
0.73
1
N/A
1.2
2.3
10
N/A
3.8
7.3
100
N/A
12
23
For transmitters rated at a maximum output power not listed above, the recommended
separation distanced 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.
NOTE 1: At 80 MHz and 800 MHz, the separation distance for the higher frequency range
applies.
NOTE 2: These guidelines may not apply in all situations. Electromagnetic propagation is
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