49
calculated from the equation applicable
to the frequency of the transmitter.
Recommended separation distance
P
12
d
1
=
E
80MHz to 800 MHz
P
23
d
1
=
E
800 MHz to 2.5 GHz
Where P is the maximum output power
rating of the transmitter in watts (W) and
d is the recommended separation
distance in meters (m).
b
Field strengths from fixed RF
transmitters, as determined by an
electromagnetic site survey
c
, should be
less than the compliance level in each
frequency range
d
. 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. The ISM (industrial, scientific, and medical) bands between 150 kHz and 80
MHz are 6.765 MHz to6.795 MHz; 13.553 MHz to 13.567 MHz; 26.957 MHz
to 27.283 MHz; and 40.66 MHz to 40.70 MHz.
b. The compliance levels in the ISM frequency bands between 150 kHz and 80
MHz and in the frequency range 80 MHz to 2.5 GHz are intended to decrease
the likelihood that mobile or portable communications equipment could cause
interference if it is inadvertently brought into patient areas. For this reason, an
additional factor of 10/3 is used in calculating the recommended separation
distance for transmitters in these frequency ranges.
