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CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier®
Front Panel Operation
5.4.3.6
CONFIG: Rx
Demod Acquisition Range:
+/- 32 kHz
For the Receive Demodualtion Acquisition Range, 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 range by first using the
digit is then changed using the
Note the following:
•
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.
5.4.3.7
CONFIG: Rx
Descrambling: Default-On
IESS-315-On
To set the Receive Descrambling mode, select Default-On, IESS-315-On, or Off using the
arrow keys, then press
Default-On
IESS-315-On
Off
Descrambler Selection Notes
As noted previously, all options are displayed all of the time, but the ◄ ► arrow keys will force
the cursor to skip past an unavailable choice.
IMPORTANT
Acq
arrow keys to select the digit to be edited; the value of the
arrow keys. Press
Descram
Off
(◄ ►,ENT)
. Note the following:
ENTER
The appropriate scrambler type is automatically selected
This only applies when Turbo is installed and has been selected as the FEC type
No scrambling
The default descrambler types are as follows:
Viterbi, no framing:
Viterbi, EDMAC frame:
Viterbi + R-S or TCM/R-S:
TPC:
(▲ ▼ ENT)
when done.
ENTER
ITU V.35 (Intelsat variant)
Comtech proprietary, frame synchronized
Per IESS-308, frame synchronized
Comtech proprietary, frame synchronized
5–25
Revision 7
MN/CDMQX.IOM
◄ ►
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