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12 | 04.10.2021 | Page 45
Whereby P is the maximum
nominal output of the
respective transmitter
specified by the manufacturer
in Watts (W), and d is the
recommended safety distance
in meters (m).
The field strength of
stationary RF transmitters,
which is definable via
electromagnetic site survey a,
should be below the
compliance level of the
individual frequency ranges b.
Disturbances are possible near
devices which bear the symbol
below.
Note: These guide values may not apply to all situations. Spreading of electromagnetic
waves is also influenced by absorption and reflection via buildings, items, persons, and
animals.
a. The field strength of stationary transmitters (e.g. base stations of mobile phones
(mobile/cordless) and mobile land mobile radios, amateur radio stations, AM and FM
radio, and TV transmitters), cannot be theoretically calculated in advance. To identify
the electromagnetic environment with regard to stationary RF transmitters, an
electromagnetic site survey should be considered. If the field strength identified at the
location at which the device is used exceeds the RF compliance level specified above, the
device should be closely observed. It may be necessary to take additional measures
(e.g. changing the alignment or transposition of the device).
b. Across the frequency range of 150 kHz to 80 MHz, the field strength should be less
than 3 V/m.
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