Warranty

© 2019 GV Concepts, Inc.
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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 strength 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 doctorgram
Electronic Stethoscope I is used exceeds the applicable RF compliance
level above, the doctorgram Electronic Stethoscope I should be
observed to verify normal operation. If abnormal performance is observed,
additional measures may be necessary, such as re-orienting or
relocating the doctorgram Electronic Stethoscope I.
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 doctorgram Electronic Stethoscope I
The doctorgram Electronic Stethoscope I is intended for use in the
electromagnetic environment in which radiated RF disturbances are
controlled. The user of the doctorgram Electronic Stethoscope I can help
prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications equipment (transmitters)
and the doctorgram Electronic Stethoscope I 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
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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.