Microtronics myDatalogNANOamr, User Manual

Page: 36 / 125

1. If you need an antenna extension, connect this to the antenna first.
2. Connect the antenna extension or antenna directly to the antenna cable of the
myDatalogNANOamr (see "Overview" on page 16).
Important note: Do not apply too much force when tightening the antenna. Do not use
any tools to tighten the antenna or antenna extension; only tighten it manually.
The following step is not mandatory.
3. Check whether the connection to the myDataweb has worked correctly (see "Testing
communication with the device" on page 43).
7.4.3 Optimum antenna positioning for assembly in a shaft
7.4.3.1 Influences on the signal quality
Steel cover up to -30dBm
Concrete cover approx. -10dBm
Environmental influences up to -15dBm
Installation height of the antenna approx. -5dBm/depth of 15 cm
Vertical/horizontal alignment approx. -10dBm
Horizontal alignment up to -15dBm
Centre/edge of the shaft approx. -10dBm
Other influences Transmission power of the network operator
Signal losses compared to the reference measurement
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
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