20
watts (W) according to the
transmitter manufacturer and
d
is
the recommended separation
distance in meters (m).
Fields 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 1 At 80 MHz and 800 MHz, 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.
a
Field strengths from fixed transmitters, such as base stations for radio (cellular /
cordless) telephones and land mobile radios, amateur radios, 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 Smoke Check is used exceeds the applicable RF compliance
level above, the Smoke Check should be observed to verify normal operation. If
abnormal performance is observed, additional measures may be necessary, such as
re-orientating or relocating the Smoke Check
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3
V / m
Recommended separation distances between portable and mobile RF
communications equipment and the Smoke Check
The Smoke Check is intended for use in an electromagnetic environment in which
radiated RF disturbances are controlled. The customer or the user of the Smoke
Check can help prevent electromagnetic interference by maintaining a minimum
distance between portable and mobile RF communications equipment (transmitters)
and the Smoke Check as recommended below, according to the maximum output
power of the communications equipment.
Rated Maximum
Output Power of
Transmitter in
Watts (W)
Separation Distance in Meters (m) according to
Frequency of Transmitter
150 KHz to 80
MHz
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
23.3
Summary of Contents for SmokeCheck
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