Citizen CH-657 Instruction Manual page 29

Guidance and manufacturer's declaration - electromagnetic immunity
The [CH-657] is intended for use in the electromagnetic environment specified below. The
customer or the user of the [CH-657] should assure that it is used in such an environment.
Immunity to Test
proximity fields Frequncy
from RF wireless (MHz)
communications
385
equipment IEC
61000-4-3
450
710
745
780
810
870
930
1720
1845
1970
2450
5240
5500
5785
NOTE If necessary to achieve the IMMUNITY TEST LEVEL, the distance between the
transmitting antenna and the [CH-657] may be reduced to 1 m. The 1 m test distance is
permitted by IEC 61000-4-3.
a). For some services, only the uplink frequencies are included.
b). The carrier shall be modulated using a 50 % duty cycle square wave signal.
c). As an alternative to FM modulation, 50 % pulse modulation at 18 Hz may be used because
while it does not represent actual modulation, it would be worst case.
Band a) Service a)
(MHz)
380-390 TETRA 400
430-470 GMRS 460,
FRS 460
704-787 LTE Band
13, 17
800-960 GSM 800/900,
TETRA 800,
iDEN 820,
CDMA 850,
LTE Band 5
1700- GSM 1800;
1900 CDMA 1900;
GSM 1900;
DECT;
LTE Band 1, 3,
4, 25; UMTS
2400- Bluetooth,
2570 WLAN,
802.11 b/g/n,
RFID 2450,
LTE Band 7
5100- WLAN 802.11
5800 a/n
- Eng 29 -
Modulation Maximum
b) power
(W)
Pulse 1.8
modulation
b) 18 Hz
FM c) 2
± 5 kHz
deviation
1 kHz sine
Pulse 0.2
modulation
b) 217 Hz
Pulse 2
modulation
b) 18 Hz
Pulse 2
modulation
b) 217 Hz
Pulse 2
modulation
b) 217 Hz
Pulse 0.2
modulation
b) 217 Hz
Distance IMMUNITY
(m) TEST LEVEL
(V/m)
0.3 27
0.3 28
0.3 9
0.3 28
0.3 28
0.3 28
0.3 9