Comtech EF Data CDM-710, Installation And Operation Manual

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CDM-710 Broadcast Satellite Modem Revision 11
Front Panel Operation MN/CDM710.IOM
5–21
(CONFIG: Rx) Dem
Æ
IQ-TP
Rx IQ TPs (J2-11,J2-3):
Pre-EQ Post-EQ (
E)
This selection determines whether the IQ test point located on the Alarm Connector samples the
IQ signal
before
or
after
the Adaptive Equalizer. J2-11 and J2-3 refer to the Alarms Connector
pins to which an oscilloscope is connected, for the purpose of monitoring I and Q.
Select Pre-Eq or Post-Eq using the W X arrow keys, then press
ENTER
.
(CONFIG: Rx) Dem
Æ
Pilot (DVB-S2 mode only)
Rx Demodulation Pilot:
O ff On ( E)
This screen is ‘
status only
’ as the demodulator automatically determines if the pilots are
Off
or
On
.
Press
ENTER
or
CLEAR
to return to the previous menu.
(CONFIG: Rx) Dem
Æ
Scr (Descrambler)( DVB-S2 mode only)
Rx Descrambling Index:
Gold-n = 000000 (
▲ ▼ E)
The Gold-n Index indicates the Physical Layer spreading sequence number.
To edit the index, use the
W X
arrow keys to select the digit to be edited, then use the
ST
arrow keys to change the value of that digit. The index can be set from 000000 to 262,141 – the
default setting is all 0 s. Press
ENTER
when done.
(CONFIG: Rx) Code
Code Rate: 1/2 3/5 2/3
3/4 4/5 5/6 7/8 8/9 9/10
Refer to the Data Rate menu for valid code rates. The cursor only lands on valid code rates
depending upon the mode and purchased options. If the Mode is set to DVB-S2, this screen is
‘
status only
’ and the demodulator automatically resolves the code rate.
Prior to synchronization of the Rx path, the cursor may reside in any position.
IMPORTANT
•
All possible choices are presented at all times.
•
If an option is not installed (either Hardware or FAST) or is not valid, or if a
code rate is not available for the Mode selected, the
◄ ► arrow keys will
force the cursor to skip past the unavailable choice.
Select the code rate by using the ◄ ► arrow keys, then press
ENTER
.