Product specifications

CDM-710 Broadcast Satellite Modem Revision 10
Front Panel Operation MN/CDM710.IOM
Select the demodulation type using the ◄ ► arrow keys. The User should then press ENTER.
If the Mode selected is DVB-S, then the menu is ‘read only’ and the cursor rests under QPSK. If
the Mode is DVB-DSNG, the allowable modes are selectable depending upon the equipment
options purchased.
In DVB-S2 mode the menu is ‘status only’ and the type of modulation is determined automatically.
Prior to synchronization of the Rx path, the cursor may reside in any position. After synchronization
(Rx Traffic LED is Green), re-enter the Type menu to update the display and the cursor rests under
the modulation type.
If Rx Demod: Æ Inv is selected:
Rx Spectrum:
Automatically Detected
This menu is ‘read only’. The demodulator automatically resolves frequency inversion. Normal
or Inverted is not reported in the demodulation.
Press
ENTER or CLEAR to return to the previous menu.
If Rx Demod: Æ Acq is selected:
Demod Acquisition Range:
+/-010 kHz (cbE)
The value entered here determines the amount of frequency uncertainty the demodulator will
search over in order to find and lock to an incoming carrier.
Edit the demodulator acquisition search range value by selecting the digit to be edited, using the
◄ ► arrow keys. The value of the digit is then changed using the
▲ ▼ arrow keys. The range
varies from ±001 kHz to ±100 kHz. The User should then press
ENTER.
If Rx Demod: Æ
α is selected:
RX (α) Rolloff %: 20 25
35 (E)
Select the Rolloff (α) setting using the ◄ ► arrow keys. The default setting is 20%. Whenever
the Mode is changed, (α) reverts to 20%, but (α) can be modified to 25% or 35% from this
menu. The User should then press
ENTER.
The rolloff or α dictates how fast the spectral edges of the carrier are attenuated beyond the 3 dB
bandwidth. With 20% rolloff the edge falls off more quickly than with 25% and 35%.
5–20