M ET E K
M ic r o R a i n R a d a r M R R - 2
10
10.2010 Valid for MRR Service Version ≥ 5.2.0.9
4.2
Description of the Components
4.2.1 Parabolic Dish
The antenna is used for the transmission of the RADAR signals and the re-
ceiving of backscattered signals. It is designed as an offset parabolic dish (1).
Its largest diameter is 70 cm, the beam width is 2°. Due to the offset-design of
the parabolic dish rainwater can drain off.
For antenna mounting the tube socket (10) (inner Ø = 49.4 mm, out-
er Ø = 54.4 mm) is to be plugged onto a pole with an outer diameter of max.
49 mm. The socket is fastened with an M10 screw (10 mm Ø).
Connect a ground wire to this screw which serves as a surge protector.
The pivot (9) is factory-adjusted, so that vertical orientation of the mounting
tube socket results in a vertical orientation of the antenna beam. (Ignore the
scale on the pivot).
The parabolic dish must not be moved in its pivot (9), because this would
cause beam deviations from vertical and would result in erroneous
measurements.
The transmitting and receiving properties of the antenna affect the radar cali-
bration. Therefore the reflector surface should be clean (e.g. free from leaves
or wet snow). For the same reason any mechanical deformation of the para-
bolic dish must be avoided. If nevertheless obvious deformation occurred, the
reflector must be replaced.
4.2.2 Antenna Heating (Option)
+
Figure 2: Antenna Heating
The back side of the reflector is optionally equipped with a heating coil. It is
covered and sealed with a molded lid (11) which provides also extra stability
for the reflector. The energy consumption increases with decreasing tempera-
tures and amounts to maximum 500 W. The heating is activated when the
temperature falls below a threshold which can be adjusted in the heating-
junction box (13). The heating coil works with 230 VAC voltage supply and
needs an extra power cable which is connected to (1).
4.2.3 RADAR Control and Processing Device and Transceiver
