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 theoreti-
cally with accuracy. To assess the electromagnetic environment due to fixed RF transmitters, an electroma-
gnetic site survey should be considered. If the measured field strength in the location in which the model
TL55 is used exceeds the applicable RF compliance level above, the model TL55 should be observed to
verify normal operation. If abnormal performance is observed, additional measures may be necessary, such
as reorienting or relocating the model TL55.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3V/m.
Table 4: Recommended separation distances between portable and mobile RF communications
equipment and the model TL55
Recommended separation distances between
portable and mobile RF communications equipment and the model TL55
The model TL55 is intended for use in electromagnetic environment in which radiated RF disturbances is
controlled. The customer or the user of the model TL55 can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment (transmitters)
and the model TL55 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
1.2 P
80 MHz to 800 MHz
1.2 P
800 MHz to 2,5 GHz
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) accordable 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 absorpti-
on and reflection from structures, objects and people.
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