7 Maintenance
7.5 Trouble Shooting
Page 80
Art. no.: 0-48-0013 Rev. m
FRED easy
7.5.4 Measures to prevent electromagnetic interferences
Further measures to prevent electromagnetic interferences:
The user can take the following measures to prevent electromagnetic interferences:
• Increase distance to the source of interference
• Turn the device to change the angle of radiation.
• Only use original accessories.
“Non-ionic electromagnetic radiation"
The user can help avoid electromagnetic disturbances by keeping the minimum dis-
tance between portable and mobile HF telecommunication devices (transmitters) and
the FRED easy®. The distance depends on the output performance of the communi-
cation device as indicated below.
HF source Transmitter fre-
quency
[MHz]
Power P
[W]
Distance d
[m]
Radio telephone (microcellular) CT1+, CT2, CT3 885-887 0.010 0.23
Cordless DECT telephone, WLAN, UMTS phone 1880-2500 0.25 1.17
Mobile phone USA 850/1900 0.6 1.8
Mobile phone
- GSM900,
- GSM850, NMT900, DCS 1800
900
850,900,1800
2
1
3.3
2.3
Walkie-talkie (rescue service, police, fire bri-
gade, service)
81-470 5 2.6
Mobile telephone system (rescue service, po-
lice, fire brigade)
81-470 100 11.7
It can be deducted from the table that portable HF telecommunication devices must
not be used within a radius of 3 m from the FRED easy® and its cables.
For more detailed information, please refer to page 85.
If the devices are used in the vicinity of power networks operating at a frequency of 16.7
Hz (railway systems in some countries), the 16.7 Hz filter must be activated via the con-
figuration software before use. The filter is by default activated.
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