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CDM-Qx Satellite Modem
Front Panel Operation
as shown below, to include the calculated Receive RF frequency of the modem/BUC
combination:
Rx IF Freq:1156.3456 MHz
RF=12156.3456
As the Rx IF frequency is edited, the RF frequency will automatically be updated.
(Config%Rx%Acq) – DEMOD ACQUISITION RANGE
Demod Acquisition Range:
+/- 32 kHz
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.
The range varies from ± 1 kHz to ± 32 kHz for 70/140 IF, ± 1 kHz to ±(symbol rate/2) up
to ±200 kHz for L-Band. For symbol rates < 64 ksps, it will be ± (symbol rate/2). For
L-Band, Acquisition Range < 625 ksps = ± 32 kHz, ≥ 625 ksps = ± 200 kHz.
Edit the acquisition search range of the demodulator (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 value by selecting the digit to be edited, using the
! " arrow keys. The value of the digit is then changed using the #$ arrow keys, then
pressing
(Config%Rx%Descram) - DESCRAMBLER
Descrambling: Default-On
IESS-315-On Off
Options are:
Default-On
IESS-315-On
Off
As before, the options are displayed all of the time, but the ◄ ► arrow keys will force
the cursor to skip past an unavailable choice.
IMPORTANT
(◄ ► ▲ ▼ ENT)
.
ENTER
The appropriate descrambler type is automatically selected.
This only applies when Turbo is installed and has been selected as the FEC type.
No descrambling.
The default descrambler types are:
Viterbi, no framing:
Viterbi, EDMAC frame:
Viterbi + RS or TCM/RS:
TPC:
▲ ▼ ENT)
(
(◄ ► ENT)
ITU V.35 (Intelsat variant)
Comtech proprietary, frame synchronized
Per IESS-308, frame synchronized
Comtech proprietary, frame synchronized
5–25
Revision 6
MN/CDMQx.IOM
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