Topcom BD-4601 User's Guide download pdf (Page 69)

Field strengths from fixed RF transmitters, as

determined by an electromagnetic site survey,

should be less than the compliance level in

each frequency range.

Interference may occur in the vicinity of

equipment marked with the following symbol:

NOTE 1 At 80 MHz and 800 MHz, 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.

Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land

mobile radios, amateur radio, 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 device is used exceeds the

applicable RF compliance level above, the deivce should be observed to verify normal operation. If abnormal

performance is observed, additional measures may be necessary, such as reorienting or relocating the device.

Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.

Recommended separation distances between

portable and mobile RF communications equipment and the device

The device is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled.

The customer or the user of the device can help prevent electromagnetic interference by maintaining a minimum

distance between portable and mobile RF communications equipment (transmitters) and the deivce as recommended

below, according to the maximum output power of the communication

s equipment.

Rated maximum output

power of transmitter

Separation distance according to frequency of transmitter

150 kHz to 80 MHz

Not applicable

80 MHz to 800 MHz

d = 1,2

800 MHz to 2,5 GHz

d = 2,3

0,01

Not applicable 0,12 0,23

0,1

Not applicable

0,38

0,73

Not applicable

1,2

2,3

Not applicable

3,8

7,3

100

Not applicable

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 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.

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Topcom BD-4601 User's Guide Page 69

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