NORTHSTAR ECHO USER’S MANUAL
© 2018 JTECH Medical MN065_N
40
Recommended separation distances between portable and mobile
RF communications equipment and the Echo Devices
The Echo Devices are intended for use in an electromagnetic environment in which radiated
RF disturbances are controlled. The customer or the user of the Echo Devices can help prevent
electromagnetic interference by maintaining a minimum distance between portable and mobile
RF communications equipment (transmitters) and the Echo Devices as recommended below,
according to the maximum output power of the communications equipment.
Rated maximum output
power of transmitter
W
Separation distance according to frequency of
transmitter m
150 kHz to 80 MHz
d=1.2√P
80 MHz to 800
MHz
d=1.2√P
800 MHz to 2.5 GHz
d=2.3√P
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
For transmitters rated at a maximum output power not listed above, the recommended
separation distance
d
in meters (m) can be estimated using the equation applicable to the
frequency of the transmitter, where
P
is the maximum output power rating of the transmitter
in watts (W) according to the transmitter manufacturer.
NOTE 1 At 80 MHz and 800 MHz, the separation distance for 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.
Transmitter and Receiver Specifications
Bandwidth
2.4GHz
Modulation
DSSS
ERP
0 dBm
