Datawell BV RX-C4, Руководство пользователя

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Possible error sources and solutions:

Error: The transmitter does not work anymore.
Solution: check batteries and replace batteries when they are dead, if the batteries are all
right: contact our service department.

Error: The crystal has changed frequency too much. This can happen because of ageing,
or when the buoy has been handled too rough, e.g. when a ship has come into collision
with the buoy.
Solution: Retune the RX-C4 receiver.
A.2 Buoy transmit antenna
The transmit antenna is the interface between the buoy transmitter and the physical channel,
namely the atmosphere.
Technical details:
A vertically polarized quarter wavelength whip with a gain of 2 dBi is used as a transmitting
antenna for the Waverider- and Directional Waverider buoys, except for the DWR-G 0.4m.
The seawater around the buoy (or another artificial ground plane) is an important part of the
antennas counterpoise and is therefore absolutely necessary for the buoy’s transmission system
in order to radiate its power efficiently. In other words, a buoy without a high conductance
groundplane such as normal soil
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will have a severely limited range.
The transmit antenna is of an omni-directional type because the rotation of the buoy is
undetermined with respect to the receiving station.
Possible error sources and solutions:

Error: the antenna has been damaged.
Solution: replace the antenna.

Error: When the buoy transmits signals but it does not manage to get the range it might
be caused by a corroded antenna connector in the antenna insert of the buoy.
Solution: replace the antenna and / or the hatchcover of the buoy.
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Normal soil is a very bad groundplane!