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CDM-710G High-Speed Satellite Modem
Front Panel Operation
(CONFIG:) Rx
Data: DEMOD unlocked
Sym: 017.379483 Msps
If the Rx Path is not locked, the message should as shown in the above example. To change the
Symbol Rate, use the
change the value of the digit, then press
The Data Rate digits also change as the Symbol Rate values are edited. The value of the Data Rate
depends upon the code rate, modulation type. When programming a new Symbol Rate (or indirectly
a Data Rate) the value is not accepted unless it is within a valid range.
Note: G.703 Interface Data Rate is fixed. The user must enter the correct Symbol Rate.
See the tables under the (CONFIG:) Tx
Rates.
'Demod unlocked'
correct Data Rate appears in the display and the demodulator has automatically resolved the
modulation type, code rate, pilots ON/OFF, FEC frame length, spectral inversion, etc. from the
DVB-S2 carrier.
The Symbol Rate is calculated using the equation
The following example illustrates the Symbol Rate as calculated for 8PSK 3/4 and E3:
Refer to Tables 6-1 and 6-2 for Symbol Rate / Data Rate Range tablature.
(CONFIG:) Rx
RX Freq: 0140.0000 MHz
Edit the RX IF Frequency. Use the
arrow keys to change the value of the digit, then press
Note the following:
70/140 MHz
L-Band
IMPORTANT
SymRate
(E)
arrow keys to select the digit to be edited. Use the
ENTER.
appears while the Rx path is not synchronized. After synchronization the
SR
= Symbol Rate;
DR
= Data Rate;
SE
= Spectral Efficiency.
SR
= 34.368/2.22814 = 15.424524 Msps
Freq
(
▲ ▼ E)
The ranges of frequencies are from 52 to 88 MHz and from 104 to 176 MHz with a
resolution of 100 Hz.
The range is 950 to 1950 MHz with 100 Hz resolution.
The bandwidth of the modulated carrier MUST stay within the IF
frequency range, or the frequency is not accepted.
SymRate menu for the valid range of Symbol/Data
SR = DR/SE
arrow keys to select the digit to be edited. Use the
ENTER.
6–20
Revision 1
MN-CDM710G
arrow keys to
, where:
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