ETEKCITY B22 User Manual page 40

EN
The device is intended for use in the electromagnetic environment specified below. The customer or the user of the device, should assure that it
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.
The MANUFACTURER should consider reducing the minimum separation distance, based on RISK MANAGEMENT, and using higher IMMUNITY
TEST LEVELS that are appropriate for the reduced minimum separation distance. Minimum separation distances for higher IMMUNITY TEST
LEVELS shall be calculated using the following equation:
Where P is the maximum power in W, d is the minimum separation distance in m, and E is the IMMUNITY
TEST LEVEL in V/m.
40
Guidance and manufacturer's declaration - electromagnetic immunity
is used in such an environment.