Vita-Course Technologies Co. Ltd. DISCOVERY ユーザーズマニュアル
RF
radiatio
n
GB/T
17626.3
2,5 GHz
The field strength of the fixed RF transmitter is
determined by the electromagnetic field survey a, and
in each frequency range the B should be lower than
the level required.
Interference may occur near the equipment that
marks the following symbols.
determined by the electromagnetic field survey a, and
in each frequency range the B should be lower than
the level required.
Interference may occur near the equipment that
marks the following symbols.
Note 1：On the 80MHz and 800MHz, formulas of higher frequency bands are employed.
Note 2：The guidance may not apply to all the situations because electromagnetic transmission is
influenced by the absorption and reflection of buildings, objects, and the human body.
a The field strength of the fixed transmitter, such as wireless (cellular / cordless) telephone, the
Note 2：The guidance may not apply to all the situations because electromagnetic transmission is
influenced by the absorption and reflection of buildings, objects, and the human body.
a The field strength of the fixed transmitter, such as wireless (cellular / cordless) telephone, the
base station of ground mobile radio, amateur radio, AM as well as FM radio and television
broadcasting, cannot be theoretically predicted. In order to evaluate the electromagnetic
environment of a fixed RF transmitter, the investigation of electromagnetic field should be
conducted. If the field strength of the device is higher than the RF level of the above-mentioned
application, the equipment shall be observed to verify its normal operation. If abnormal
performance is observed, supplementary measures may be necessary, including reorientation or
repositioning of the equipment.
broadcasting, cannot be theoretically predicted. In order to evaluate the electromagnetic
environment of a fixed RF transmitter, the investigation of electromagnetic field should be
conducted. If the field strength of the device is higher than the RF level of the above-mentioned
application, the equipment shall be observed to verify its normal operation. If abnormal
performance is observed, supplementary measures may be necessary, including reorientation or
repositioning of the equipment.
b In the whole frequency range of 150 kHz to 80 MHz, the field strength should be less than 3 V/m.
Recommended isolation distance between portable and mobile RF communications devices and
Discovery 1
The device is expected to be used in a controlled electromagnetic environment where radiated RF
is disturbed. On the basis of the maximum output power of communication equipment, purchasers or
users of Discovery 1 can maintain the minimum distance between Discovery 1 and portable and mobile
RF communication equipment (transmitter) and accordingly prevent electromagnetic interference.
users of Discovery 1 can maintain the minimum distance between Discovery 1 and portable and mobile
RF communication equipment (transmitter) and accordingly prevent electromagnetic interference.
Rated maximum
output power of
output power of
transmitter /W
Isolation distance corresponding to different frequencies of transmitter
150 kHz ～ 80 MHz
d =
P
2
.
1
80 MHz ～ 800 MHz
d =
P
2
.
1
800 MHz～ 2,5 GHz
d =
P
3
.
2
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