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 is affected by absorption and
reflection from structures, objects and people.
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 address 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 Eko Electronic
Stethoscope System is used exceeds the applicable RF compliance level
above, the Eko Electronic Stethoscope 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 Eko Electronic
Stethoscope 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 Eko Electronic Stethoscope
System
The Eko Electronic Stethoscope System is intended for use in the
electromagnetic environment in which radiated RF disturbances are
controlled. The user of the Eko Electronic Stethoscope System can help
prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications equipment (transmitters)
and the Eko Electronic Stethoscope 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 2.5 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 affected by absorption and reflection from structures, objects and people.
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