User's Manual Part 2

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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. Electromag-
netic propagation is affected by absorption and reflection from struc-
tures, 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 pre-
dicted theoretically with accuracy. To assess the electromagnetic envi-
ronment due to fixed RF transmitters, an electromagnetic site survey
should be considered. If the measured field strength in the location in
which the COM-DEX is used exceeds the applicable RF compliance level
above, the COM-DEX should be observed to verify normal operation. If
abnormal performance is observed, additional measures may be neces-
sary, such as re-orienting or re-locating the COM-DEX.
b. Over the frequency range 150 kHz to 80 MHz, field strengths should
be less than 3 V/m.
Recommended separation distances
Recommended separation distances between portable and mobile RF
communication equipment and the COM-DEX.
The COM-DEX is intended for use in the electromagnetic environment in
which RF disturbances are controlled. The customer or the user of the
COM-DEX can help prevent electromagnetic interference by maintaining
a minimum distance between portable and mobile RF communications
equipment (transmitters) and the COM-DEX as recommended below,
according to the maximum output power of the communications equip-
ment.
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 0.38 0.38 0.73
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