NorthEast Monitoring, Inc. NEMM019-Rev-O
Page 33 of 35
DR200/HE & DR300 Operator’s Manual
Appendices: Appendix D: EMC Information
Recommended separation distances between portable and mobile RF communications equipment
and the Northeast Monitoring DR200/HE and DR300 Digital Recorder
The Northeast Monitoring DR200/HE and DR300 Digital Recorders are intended for use in the
electromagnetic environment in which radiated RF disturbances are controlled. The customer of the user
of the recorder can help prevent electromagnetic interference by maintaining a minimum distance between
portable and mobile RF communications equipment (transmitters) and the recorder 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 metres (m) can be estimated using the equation 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.
