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What is demodulator Channel 16 used for and how I configure it?

The LD2 firmware stores a list of the geo-stationary satellites which are used to deliver the VERIPOS correction data. It also stores the associated frequencies and data rates.

The user can normally select a satellite simply by choosing its name from a list.

Channel 16 is included to allow the user to manually enter satellite parameters. This is only necessary if changes are made to the satellite constellation after the firmware is issued.

Configure Satellite Parameters in Channel 16

Repeatedly press the *Page* key until the screen below is displayed:

Press *Enter* key to display the screen below:

Press *Enter* key and then the *Page* key. This will display the screen below:

Press *Enter* key and then the *Page* key. This will display the screen below:

Press the *Enter* key to access the first screen in this sub menu.

This is the Channel 16 Edit screen, which allows the user to enter the name of the beam e.g. XXVE as shown below:

This is the Channel 16 Edit screen, which allows the user to enter the name of the beam
25E expressed in Roman numerals - numbers are not available 

Press the *Enter* key again and the first character of the name is highlighted. Use the *Toggle* key to step through the letters of the alphabet. When the correct character is display, press the *Enter* key which steps on to the next letter. The maximum length of the name is restricted to 8 characters.

After the eighth letter, or blanks have been entered, press the *Enter* key the display moves on to the Frequency selection display shown below:

press the *Enter* key the display moves on to the Frequency selection display

Press the *Enter* key again and the first number of the frequency is highlighted. Using the *Toggle* and *Enter* keys as before, set the required new frequency. (The example shows a frequency of 1537460000Hz.)

After the last number, has been set, press the *Enter* key.  The display moves on to the Data Rate display shown below:

The display moves on to the Data Rate display

Press the *Enter* key again to move the cursor to the right of “Data Rate:”

If necessary, press the *Toggle* key to select the required data rate. (The rate is normally 1200bps).

Press the *Enter* key to confirm the choice.

Press the *Page* key repeatedly to return to the main menu.

This completes the entry of the satellite information into Channel 16. It is now necessary to select this channel:

Select Channel 16

Begin at the main menu using the *Page* key toggle through the menu until Configuration screen is displayed:

Press *Enter* key to access the next menu level this will display the screen below:

Press *Enter* key to access the next menu level this will display the screen below:

Press *Enter* again to access the downlink channel table:

Now Press the *Toggle* key to step through the available downlink beams until Channel 16 (XXVE) is displayed then press *Enter*. This will move the cursor to the right hand side of the screen and the letter "N" will be displayed:

This will move the cursor to the right hand side of the screen and the letter "N" will be displayed

Press the *Toggle* key to change the character from an "N" to a "Y", followed by the *Enter* key to confirm the change.

This will change the selected beam to Channel 16. The screen will now display:

This will change the selected beam to Channel 16. The screen will now display

The “>” indicates that this beam is selected.

Note:

  1. After a few seconds, the “Sync” indicator should illuminate to confirm that the demodulator is locked to the satellite.
  2. It is good practice to check the signal level from the Status/Demodulator menu.
  3. Once new beam has been selected it may take up to 20 minutes for a new station list to populate.
  4. After waiting for the station list to populate, the user should configure port P2 and/or P4 to enable the required reference stations. (Configure/Serial Ports)

 

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