Datawell 45100, Руководство пользователя

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4.3 Changing the reception frequency
The RX-D2 is delivered with a factory-installed receiver crystal. This receiver crystal can be
exchanged to allow reception of other frequencies within the specified frequency range (
see
chapter 6 ).
When the frequency of the receiver needs to be changed, the recommended procedure is to send
the RX-D2 back to Datawell for exchanging of the crystal and subsequent realignment of the
receiver. Please contact Datawell sales for more information.
4.3.1 Crystal exchange procedure
Although Datawell recommends to send the RX-D2 back to Datawell when the frequency needs
to be changed, the crystal exchange procedure can be carried out locally by following the
procedure below. However, the crystal exchange procedure should only be carried out by
qualified personnel.

Check crystal and mixing mode
The frequency of the receiver crystal must be either 9MHz higher or 9MHz lower than the
frequency being received. This is called ‘HIGH’ or ‘LOW’ mixing. The mixing mode
depends on the frequency band of the receiver. To check if the receiver is using high or low
mixing see
paragraph 4.2 .

Disconnect power
For safety reasons, first remove power by disconnecting the power cable and all other
cabling from the receiver.

Disassemble the receiver
The crystal is accessible from the underside of the receiver. To get access to the crystal,
only the bottom plate of the receiver needs to be removed. The bottom plate is fixed by
four flat screws.

Exchange receiver crystal
The receiver crystal is located on the left-hand side of the main PCB, see figure 4.4 . The
crystal is secured to the socket using a rubber band. Make sure this rubber band is securing
the new crystal properly. The crystal has no polarity (e.g. it can be inserted either way).

Realign the receiver
The receiver needs to be realigned after a crystal change. Follow the realignment procedure
as described in
paragraph 4.2.1 .

Reassemble the receiver
Reassemble the receiver by fixing the bottom plate using the four flat screws.
4.4 W@ves21 and SeaSaw21
The recommended software packages for use with the RX-D2 are the Datawell W@ves21 and
SeaSaw21 software packages. These software packages manage the interpretation and analysis
of the received data.
Refer to the documentation on W@ves21 and/or SeaSaw21 for more information.