28
Conducted RF
GB/T 17626.6
Radiated RF
GB/T 17626.3
3 Vrms
150 kHz～80 MHz
3 V/m
80 MHz～2.5 GHz
3 Vrms
3 V/m
Portable and mobile RF communications
equipment should be used no closer
to any part of DA-20, including cables, than the recommended
separation distance calculated from the equation applicable to
the frequency of the transmitter.
Recommended separation distance
Where P is the maxi mum output power rating of the transmitter
in watts (W) according to the transmitter manufacturer and d is
the recommended separation distance in meters (m).Field
strengths from fixed RF transmitters, as determined by an
electromagnetic site survey,
a
should be less than the
compliance level in each frequency range.
b
NOTE 1 - At 80 MHz and 800 MHz, 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.
a. Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephone 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
theDA-20 is used exceeds the applicable RF compliance level above, DA-20 should be observed to verify normal operation. If abnormal
performance is observed, additional measures may be necessary, such as reorienting or relocating DA-20.
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
GHz
MHz
p
E
d
MHz
MHz
p
E
d
p
V
d
5
.
2
800
1
7
80
80
1
5
.
3
1
5
.
3
～
～
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