Dexcom G4 User Manual page 127

Recommended Separation Distances Between Portable and Mobile RF
Communications Equipment and the Receiver
The receiver is intended for use in an electromagnetic environment in which
radiated RF disturbances are controlled. The customer or the user of the
receiver can help prevent electromagnetic interference by maintaining a
minimum distance between portable and mobile RF communications equipment
(transmitters) and the receiver as recommended below, according to the
maximum output power of the communications equipment.
Rated Separation Distance
maximum According to Frequency of Transmitter (m)
Output Power of
150 kHz to 80 MHz
Transmitter (W)
d = 1.2 √
0.01 0.12
0.1 0.38
1 1.2
10 3.8
100 12
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.
80 MHz to 800 MHz
d = 1.2 √
P P
0.12
0.38
1.2
3.8
12
800 MHz to 2.5 GHz
d = 2.3 √
P
0.23
0.73
2.3
7.3
23
Dexcom G4 User's Guide | 127