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 re-orienting 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
= 0,58
√
P
80 MHz to 800 MHz
d
= 1,2
√
P
800 MHz to 2,5 GHz
d = 2,3 √P
0,01
0,058
0,12
0,23
0,1
0,18
0,37
0,74
1
0,58
1,2
2,3
10
1,8
3,7
7,4
100
5,8
12
23
For transmitters rated at a maximum output power not listed above, the recommended
separation distance
d
in metres (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.
