A&D TM-2440 Instruction Manual page 93

Recommended separation distances
The recorder is intended for use in an electromagnetic environment in
which radiated RF disturbances are controlled. Electromagnetic
interference can be prevented by maintaining a minimum distance
between portable or 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)
150 kHz to 80 MHz
d
0.01
0.1
1
10
100
For transmitters rated at a maximum output power not listed above,
the recommended separation distance
estimated using the equation applicable to the frequency of the
transmitter. Where
transmitter in watts (W) according to the transmitter manufacturer.
Recommended separation distance
according to frequency of transmitter (m)
= 1.2
0.12
0.38
1.2
3.8
12
P
is the maximum output power rating of the
80 MHz to 800 MHz
d
= 1.2
0.12
0.38
1.2
3.8
12
d
in meters (m) can be
75
d
800 MHz to 2.5 GHz
d
= 2.3
0.23
0.73
2.3
7.3
23