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HID-2138 User Manual
TABLE4
RECOMMENDED SEPARATION DISTANCES BETWEEN PORTABLE AND MOBILE
The system is intended for use in an electromagnetic environment in which radiated RF
disturbance are controlled. The customer or the user of system can help prevent
electromagnetic interference by maintaining a minimum distance between portable and
mobile RF communication equipment (transmitters) and system as recommended below,
according to the maximum output power of the communication equipment.
Rated Maximum
Output power of
Transmitter
(W)
0.01
0.1
1
10
100
For transmitters at a maximum output power not listed above, the recommended
separation distanced 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.
If system image distortion occurs, it may be necessary to position system further from
sources of conducted RF noise or to install external power source filter to minimize RF noise
to an acceptable level.
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.
HID-2138 Quick Reference Guide
RF COMMUNICATION DEVICE AND SYSTEM
Separation Distance According to Frequency of Transmitter
150kHz -80MHz
0.35
1.11
3.50
11.07
35.00
(m)
80MHz-800MHz
0.12
0.37
1.17
3.69
11.67
800MHz-2.5GHz
0.23
0.74
2.34
7.38
23.34
59
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