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Recommended separation distances between portable and mobile RF communications equipment and CORE 500 Digital Stethoscope
The CORE 500 Digital Stethoscope is intended for use in the electromagnetic environment in which radiated RF disturbances are controlled. The user of the CORE 500 Digital
Stethoscope can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and
the CORE 500 Digital Stethoscope 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 2.5 GHz
d = 2.3 √P
0.01 0.12 0.12 0.23
0.1 0.37 0.37 0.74
1 1.2 1.2 2.3
10 3.7 3.7 7.4
100 12 12 23
For transmitters rated at a maximum output power not listed above, the recommended separation distance d is meters (m) can be estimated using the equation applicable to the
frequency of the transmitter, where P is the maximum 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 aected by absorption and reflection from structures, objects and people.
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