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Installation/De-installation
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– E65C – CU-P40, P41, P42 – User Manual
CU-P4x
-85 dBm
Cable 10 m: -15 dB
-80 dBm (good)
CU-P4x
-65 dBm
Cable 3 m: -4.5 dB
-89.5 dBm (sufficient)
Building structure: -20 dB
Fig. 4.8
Example inside placement of the antenna
In this case a sufficient reception field strength results for the antenna with
3 m cable placed inside the building as well as for the antenna with 10 m
cable placed outside the building. It is therefore advisable to use the
cheaper inside placement of the antenna under these circumstances.
The reception field strength effectively present at the communication unit
CU-P4x can be verified with the LEDs (see section 4.4.3) or more precisely
with the MAP Service Tool.
4.4.3
Choosing the most suitable antenna position in GPRS mode
Field strength indication with .MAP110
1.
In the command tree select the dlms Execute Command "Enable Field
Strength Indication".
2.
Now, the LEDs TX and RX display the field strength according to the
following table.
Reception level
Field strength level
RX
TX
Level 1 (inadequate)
<
–99 dBm
off
off
Level 2 (sufficient)
–99 dBm ... –90 dBm
off
on
Level 3 (good)
–89 dBm ... –80 dBm
on
off
Level 4 (very good)
>
–80 dBm
on
on
3.
In the command tree select the Diagnostic Command "CU GSM Instal-
lation Support" to display the current field strength at the antenna.
