Appendix B: Electromagnetic Compatibility
Recommended Separation Distance between Portable and Mobile RF Communications Equipment and the Warmer
B-4 Service Manual
Note 3: Electromagnetic propagation is affected by absorption and reflection from structures, objects, and
people.
Note a: Field strengths from fixed transmitters such as base stations for radio, cellular/cordless telephones
and land mobile radios, amateur radios, AM and FM radio broadcasts and TV broadcasts cannot be
predicted theoretically with accuracy. To assess the electromagnetic environment due to fixed RF
transmitters, an electromagnetic site survey should be considered. If the measured field strength in
the location in which the Giraffe/Panda Warmer unit is used exceeds the applicable RF compliance
level above, the unit should be observed to verify normal operation. If abnormal performance is
observed, additional measures may be necessary, such as re-orienting or relocating the Giraffe/
Panda Warmer.
Note b: Over the frequency range 150 KHz to 80 MHz field strengths should be less than 3 V/m.
B.5 Recommended Separation Distance between Portable and Mobile RF
Communications Equipment and the Warmer
The Giraffe/Panda Warmer is intended for use in an electromagnetic environment in which radiated RF
disturbances are controlled. The customer or the user of the Giraffe/Panda Warmer can help prevent
electromagnetic interference by maintaining a minimum distance between portable and mobile RF
communications equipment (transmitters) and the Giraffe/Panda Warmer as recommended below,
according to the maximum output power of the communications equipment.
Note: At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
Note: These guidelines may not apply in all situations. Electromagnetic propagation is affected by
absorption and reflection from structures, objects and people.
Rated maximum
output power of
transmitter (W)
Separation distance in meters (m) according to frequency of transmitter
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
1.0 1.2 1.2 2.3
10.0 3.8 3.8 7.3
100.0 12.0 12.0 23.0
For transmitters rated at a maximum output power not listed above, the recommended separation
distance (d) in meters (m) can be determined 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.
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