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ARF868 Radio Modems - Guide utilisateur / User guide version V2.2.3
1.9.2 Positioning of the modems
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Install the modem at a minimum height of 2m and not against the face, ideally offset by 20 cm (5 to 10 cm minimum).
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The RS232 cable should not exceed 15m in length and must be shielded.
FR
EN
1.9.3 Positioning of the aerial
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In the event of use of a modem fitted with a TNC base for a remote aerial, we recommend using our range of aerials (Cf catalogue of
Stand-alone products available on our web site,).
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The aerial should be installed in a free field, at least 10 cm away from any conducting material. There should be no metal obstacle within a
range of less than one metre.
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Install the 2 aerials in view of each other.
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If the modem is installed in an electrical cabinet, the aerial should be installed outside. The same applies if the modem is placed inside a
building and it needs to communicate with a modem positioned outside.
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The co-axial cable should be as short as possible (memo: cable of 25m => 6db of attenuation => range divided by 2)
Antenna
1.9.4 Positioning of power and serial cables
To ensure optimal operation of ARF868 modems, it is essential to ensure that the power and serial communication cables are properly connect-
ed and positioned.
Improper positioning of the cables can significantly reduce the performance of modems.
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The cables must be securely attached to the modem
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The cables must be kept away from the antenna
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The cables should not be coiled or tangled
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The cables should be positioned vertically in the modem
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The cables must not be excessive length
20cm
100cm
100cm
Antenna
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