User Manual for David30 GNSS Receiver v2.0
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is installed in the rover station bracket.
1) Large amount of heat would be generated when the radio is in transmission.
When the radio is working, please do not place the radio in poor ventilated
box, wrap or cover any item on the surface of the radio.
2) In an environment with a high temperature of more than 40 °C or intense
sunlight, the surface of the radio would be hot when it is transmitting at high
power. It may cause scald if the surface of the machine is touched directly.
Please pay special attention.
6.6.3 Antenna Installation
Whether the antenna is properly installed and erected would seriously affect
the transmission distance of the radio, hence the correct connection and
installation of the antenna is of high importance.
1) It is strictly forbidden to use a damaged antenna. The output impedance of
the antenna interface of this radio is 50 ohms. Please use antennas and
feeders with input impedance of 50±2 ohms and VSWR less than 1.5.
Using an antenna that is not strictly matched with this radio would result in
a shortened transmission distance for the radio, and it is possible to
damage the radio if the mismatch is particularly serious.
2) The original antenna of this radio is strictly matched with this radio, and the
performance meets the requirements of this radio. The original antenna of
this radio would better play the performance of this radio.
3) Under normal circumstances, the height of the antenna installed from the
ground would significantly increase the transmission distance and improve
the transmission effect.
4) Carefully check the connection of the antenna, feeder, connector and the
components of the radio to ensure well contact and reliable connection
between the antenna and the connector of the radio.