User's Manual

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LBL-0151 | User Supplemental Information, Effective: xxXXX2013
7
Extended-Use PATCH 
affected by absorption and reflection from structures, objects and people.
a
Field strengths from fixed transmitte
r
s, 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
Proteus Patch is used exceeds the applicable RF compliance level above, the Proteus
Patch should be observed to verify normal operation. If abnormal performance is
observed, additional measures may be necessary, such as re-orienting or relocating the
Proteus Patch.
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 Proteus Patch
The Proteus Patch is intended for use in an electromagnetic environment in which
radiated RF disturbances are controlled. The customer or the user of the Patch can help
prevent electromagnetic interference by maintaining a minimum distance between
portable and mobile RF communications equipment (transmitters) and the Proteus Patch
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
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 Not applicable 0.1 0.23
0.1 Not applicable 0.4 0.74
1 Not applicable 1.2 2.3
10 Not applicable 3.7 7.4
100 Not applicable 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.
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