Note:
Practical example:
GSM level
Position
-67dBm
Reference measurement outside the shaft
-103 dBm
Measurement at a depth of 1.20 m
-95dBm
Vertically on the edge of the shaft at a depth of approx. 15 cm
-83dBm
Centre of the shaft, horizontal on the steel fitting
-89dBm
Antenna turned by 90°
-78dBm
Centre of the shaft, vertical
-75dBm
Plastic pipe used instead of steel fitting
7.4.3.2 Possibilities for improving the signal quality
l
Drill a duct for the antenna into the concrete ring on the shaft to bypass the steel cover
l
Insert the antenna extension in an existing ventilation or supply pipe
l
Use special types of antennas (Note that the use of antennas not approved by the manufacturer with
devices that are Ex approved will render this approval invalid)
7.4.3.3 Procedure for determining the optimum position of the antenna
1. Install the myDatalogNANO as described in chapter "Installing the myDatalogNANO " on page 39.
During this process, also observe the notes regarding the influences on the signal quality (see "Typical
influences on the signal quality" on page 49).
2. Initiate ALOHA transmission mode (see "ALOHA transmission mode" on page 32).
3. Wait until it is indicated in the list of measurement instruments that the device is in ALOHA transmission
mode. This is indicated by a speech bubble with the "Aloha" inscription.
4. Check the incoming data in the ALOHA data window of the myDatanet server, which can be accessed
by clicking on the speech bubble with the "Aloha" inscription (see "myDatanet Server Manual "
805002). Particular attention must be paid to the internal"GSM level" measurement value. Change the
position of the antenna to obtain the best possible signal quality.
Note:
A security stock of 15dBm is highly recommended.
50
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