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55
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 the SBC
21
is
used exceeds the applicable RF compliance level above, the SBC
21
should be observed to verify normal operation. If abnormal performance is
observed, additional measures may be necessary, such as re-orienting or relocating the SBC
21
.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Table 4
For ME EQUIPMENT and ME SYSTEMS that are not LIFE-SUPPORTING
Recommended separation distances between portable and mobile RF communications equipment and the SBC21
The SBC
21
is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or the user of the
SBC
21
can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications equip-
ment (transmitters) and the SBC
21
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 =
3.5
V
1
80 MHz to 800 MHz
d =
3.5
E
1
800 MHz to 2.5 GHz
d =
7
E
1
0,01 0.117 0.1167 0.2334
0,1 0.370 0.3689 0.7378
1 1.170 1.1667 2.3334
10 3.700 3.6893 7.3786
100 11.7 11.6667 23.3334
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in meters (m) can be determined
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 affected by absorption and reflection from structures,
objects and people.
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