20
4.2.3 Speaker
The speaker is used to get an audible indication of the signal quality. A 1500 Hz frequency-
modulated beat-note should be heard against a clean background (none or clean noise without
any sign of interference or noise bursts).
The speaker can be switched on and off by pressing the “▲ ” button
NOTE:
If the signal is heard clearly through the speaker but the receiver fails to
synchronize, check if the receiver mode is set correctly (see
paragraph 4.1.3
4.3 Using the web interface
The RX-C4 has an embedded web interface available at TCP/IP port 80. The embedded web
interface allows remote monitoring and configuration of the RX-C4 receiver.
To use the web interface, the RX-C4 must be properly configured (see
paragraph 4.1.4
) and
connected to a LAN (see
paragraph 3.4
To access the web server from a computer, enter the following address in the address bar of the
web browser:
http://<RX-C4 IP address>
For example, when the RX-C4 IP address is the default of 192.168.0.101:
http://192.168.0.101
Figure 4.8. RX-C4 web interface home page.
This will bring up the RX-C4 web interface home page as shown in figure 4.8. The home page
shows the current receiver status and the current server status (see
paragraph 4.4)
. The menu on
the right gives access to the “settings” page and the “about” page.
The frequency correction value is a measure of the frequency deviation of the buoy transmitter.
The frame error rate gives an indication of the signal quality. A value of 0% indicates that all
vectors are decoded without any errors; signal quality is perfect. A value of 99% indicates that
almost every vector contains errors; signal quality is bad.
