CDM-625 Advanced Satellite Modem
Revision 1
Front Panel Operation
MN-0000036 (Ref MN/CDM625.IOM)
5.4.4.2
Config: Rx
Æ
Freq (Frequency)
Rx-IF Frequency: 0050.0000 MHz
(
34v
)
Select each digit of the frequency to be edited using the
◄
►
arrow keys. Edit the value of the
digit using the
▲
▼
arrow keys. When editing is complete, press
ENTER
. The available
frequency ranges are:
•
50 - 180 MHz, and
•
950-1950 MHz (L-band) – FAST option
The resolution is 100Hz.
If an LNB LO-frequency has been configured using the ODU menus, then this menu will show a
second line of information (the example shown here uses low-sided mix):
Rx-IF Frequency: 1200.0000 MHz
(LO:12500 MHz Sat:13700.0000 MHz) (
34v
)
As the IF frequency is edited, the Satellite frequency is updated accordingly.
Satellite Frequency = LO +/- IF frequency, where the sign is determined by the LO mix parameter:
•
High-sided mix [-] (includes a spectral inversion)
•
Low-sided mix [+].
5.4.4.3
CONFIG: Rx
Æ
FEC
Decoder=Vit (None,Vit,TCM,TPC,LDPC)
Reed-Solomon=Off (Off,On)
(
34v
)
Select the parameter to edit –
Decoder
or
Reed-Solomon
– using the
◄
►
arrow keys, then
press
ENTER
.
The Decoder options are shown in the parentheses. Scroll through the options using the
▲
▼
arrow keys, then press
ENTER
. The choices are:
•
None (uncoded)
•
Viterbi
•
TCM (Trellis Coded Modulation) – 8-PSK Rate 2/3 only
(FAST option)
•
TPC (Turbo)
(Hardware option)
•
LDPC (
Hardware option
)
Note:
The options of TPC or LDPC decoding are displayed only if a TPC/LDPC Codec is installed.
5–17
