Procedure
#4: Installing and Configuring the DVB-S2 Receiver
Note: The S300 Receiver Instructions referred to below are from version
1.00 of the Novra S300 Receiver User Manual.
- Purchase your DVB-S2 receiver from www.novra.com (model
S300).
- Physical Connection - Complete the instructions in section 3 of the S300
Receiver Instructions. For the initial setup you will need to use a computer
running Microsoft Windows. Once the DVB-S2 receiver has been configured you
will no longer need the Windows computer.
- IP configuration - Complete the instructions in section 4.1.1 of
the S300 Receiver Instructions. We connected our DVB-S2 receiver to a Windows
computer via a crossover cable and used the settings listed below and in
steps 4 and 5.
- In the Network window of the DVB-S2
configuration utility, we used the following settings, as they match
the previous recommended settings for the S75 receiver, eliminating
the need to change network settings on the NOAAPORT ingest computer.
If you are using a custom network address for your ingest computer
(not 192.168.1.3), adjust the receiver IP and default gateway addresses
accordingly.
- Receiver IP Address: 192.168.1.10
- Subnet Mask: 255.255.255.0
- Default Gateway: 192.168.1.3
- Enable IGMP Filtering: unchecked
- Status Destination Port: 0x1974
- Status Destination IP: 255.255.255.255
- Satellite Configuration - section 4.1.2 of S300 Receiver Instructions. Note:
The values in steps B through H are subject to change dependent upon NWS
actions.
- Click on the Satellite button in the S300 Management
Console, and the Satellite window should appear.
- Check the Automatic checkbox in the Symbol
Rate field.
- Enter 1154.15 into the RF Freq. field.
- Set MODCOD to 2/3 8PSK.
- Set Band (Tone) to High.
- Set Search Mode to DVB-S2.
- Check Enable box for Input Stream
ID Filter and enter
13 for the ISI.
- Set Polarization to Horizontal / Left.
- The LNB Power settings depend on your LNB. The NWS
uses self-powered LNBs so they set LNB Power to Off.
At SSEC our LNBs are not self-powered so LNB Power is
set to On. If you are unsure which setting to use, consult
your LNB receiver manual, or, if you have an existing S75 receiver, check
its configuration settings.
- Click the Apply button.
- Conditional Access Module Configuration - section 4.1.3 of S300 Receiver
Instructions
- Click on the CAM button in the S300 Management
Console and the Conditional Access Module window
should appear.
- Enter 101 into the Prog # field
and click on the ADD button.
- Repeat step B with the values; 102, 103,
104, and 105.
- Click the Apply button.
- The main window of the S300 Management Console should now include
the settings listed below.
-
Sym. Rate: 15.120 Mbps (Auto)
Carr. Freq.: 1154.0 (actual frequency is 1154.15,
but the display apparently rounds down)
MODCOD: 2/3 8PSK
If you have signal lock you should also see the following:
PER: (should be very small, near zero)
Uncorrectables: (also very small, preferably zero)
After completing the steps above, the Status, Signal and Data indicators
should be green, and the Selected device should
show IP: 192.168.1.10 (or your custom IP address).
If so, continue to step 7 below.
- Disconnect the DVB-S2 receiver from the Windows computer.
- Connect the DVB-S2 receiver to the NOAAPORT ingest computer.
Steps 9 and 10 below are for modifying a dynamic kernel tuning parameter
on the NOAAPORT ingest computer to allow the operating system to better
handle the bursts of data typical with the NOAAPORT DVB-S2 signal.
These particular instructions are for Red Hat Enterprise Linux.
For other operating systems, or more information about the issue, see the
12 May 2011 post to the Unidata ldm-users mailing list .
- Login to the NOAAPORT ingest computer as user root and
run the command below.
Type: sysctl -w net.ipv4.ipfrag_max_dist=0
- Edit file /etc/sysctl.conf and add the line below to the bottom of the
file.
net.ipv4.ipfrag_max_dist = 0
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