and TV broadcast cannot be predicted theoretically with accuracy. To assess the elec-
tromagnetic environment due to fixed RF transmitters, an electromagnetic site survey
should be considered. If the measured field strength in the location in which the
4508 is used exceeds the applicable RF compliance level above, the 4508 should be
observed to verify normal operation. If abnormal performance is observed, additional
measures may be necessary, such as re-orienting or relocating the 4508.
b
:
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than
[V1] V/m.
For ME EQUIPMENT and ME SYSTEMS that are not LIFE-SUPPORTING
Recommended separation distances between
portable and mobile RF communications equipment and the 4508
The 4508 is intended for use in an electromagnetic environment in which radiated RF
disturbances are controlled. The customer or the user of the 4508 can help prevent
electromagnetic interference by maintaining a minimum distance between portable
and mobile RF communications equipment (transmitters) and the 4508 as recom-
mended 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
0.38
0.38
0.73
1
1.2
1.2
2.3
10
3.8
3.8
7.3
100
12
12
23
For transmitters rated at a maximum output power not listed above, the
recommended separation distance d in meters (m) can be determined 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 propagati-
on is affected by absorption and reflection from structures, objects and people.
