TruNode
®
Gamma Probe System User Manual
26
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
TruNode® Gamma Probe System is used exceeds the applicable RF compliance level above,
the TruNode® Gamma Probe System should be observed to verify normal operation. If
abnormal performance is observed, additional measures may be necessary, such as reorienting
or relocating the TruNode® Gamma Probe System.
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 TruNode® Gamma
Probe System
The TruNode® Gamma Probe System is intended for use in an electromagnetic
environment in which radiated RF disturbances
are controlled. The customer or the user of the TruNode® Gamma Probe System can
help prevent electromagnetic interference
by maintaining a minimum distance between portable and mobile RF communications
equipment (transmitters) and the TruNode® Gamma Probe System 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 = 1.2
P
80 MHz to 800
MHz
d = 1.2
P
800 MHz to 2.7 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
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) 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.
