Koden MDC-2200 series, Руководство по установке

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MDC-2200/2500 Series Preface
0092625002-00 1
Preface
[Precaution for safety issues]
Precaution for operation
• Caution about rotating antenna:
The radar antenna may start rotating without notice. Please keep away from the antenna for your
safety.
• Caution about health risks caused by radio wave:
Powerful electromagnetic waves are emitted from the antenna during operation. These waves can
cause ill effects on human bodies when exposed to continuous irradiation.
International criteria
Though the international regulation states that the electromagnetic waves with a high-frequency
power density of not more than 100 W/m
2
do not have an ill effect on human bodies, medical
devices such as a pace makers are sensitive to electromagnetic waves with minute electric power
and their behavior may become unstable. In any event, any person with such a device must keep
away from electromagnetic sources.
Specified power density and distance from antennas (according to the
provision as specified in IEC 60945)
Transmission power / antenna length 100 W/m
2
10 W/m
2
4kW / 3 feet antenna 0.9 m 2.85 m
4kW / 4 feet antenna 1.01 m 3.2 m
6kW / 4 feet antenna 1.09 m 3.46 m
6kW / 6 feet antenna 1.3 m 4.10 m
12kW / 4 feet antenna 1.55 m 4.89 m
12kW / 6 feet antenna 1.84 m 5.81 m
25kW / 6 feet antenna 2.82 m 8.91 m
25kW / 9 feet antenna 3.35 m 10.6 m
Japan domestic criteria
In Japan, this criteria "radio-wave protection recommendation" was issued from the Ministry of
Internal Affairs and Communications in 1997.
In the recommendation, for frequencies of 3GHz or more, such as radar system, the allowable
electrical power that enters into eyes most restricted. According to it, in a generic environment
(when living without knowing to be exposed to it) 2 mW/m
2
or less (mean value for 6 minutes) is
considered as a safe value.
Figure 0-1 and 0-2 show examples in which the safety criteria are applied to radar Antenna unit
RB719A (25kW, 6ft).