Philips DigiTrak XT Instructions For Use Manual page 43

ADDITIONAL NOTES
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 broadcast and TV broadcast
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 DigiTrak XT recorder is used exceeds the applicable RF
compliance level above, the DigiTrak XT recorder should be observed to verify normal operation. If
abnormal performance is observed, additional measures may be necessary, such as reorienting or
relocating the DigiTrak XT recorder.
B Over the frequency range 150 kHz to 80 MHz, field strengths should be less than [3] V/m.
Table A-4. Recommended Separation Distances Between Portable and Mobile RF
Communications Equipment and the DigiTrak XT recorder: for equipment and
systems that are not life-supporting
The DigiTrak XT recorder is intended for use in the electromagnetic environment in which
radiated RF disturbances are controlled. The customer or the user of the DigiTrak XT
recorder can help to prevent electromagnetic interference by maintaining a minimum
distance between portable and mobile RF communications equipment (transmitters) and the
DigiTrak XT recorder as recommended below, according to the maximum output power of
the communications equipment.
Rated Maximum Output
Power of Transmitter W
0.01
0.1
1
10
100
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 the absorption and reflection from structures, objects, and people.
Separation Distance According to Frequency of
Transmitter (m)
150 KHz to 80 MHz to
80 MHz 800 MHz
D = 1.2vP D = 1.2vP
.12 .12
.38 .38
1.2 1.2
3.8 3.8
12.0 12.0
DigiTrak XT Recorder Instructions for Use
Electromagnetic Compatibility (EMC)
800 MHz to 2.5
GHz
2.3vP
.23
.73
2.3
7.3
23.0
A-5