Comtech EF Data CDM-710G, Installation And Operation Manual

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CDM-710G High-Speed Satellite Modem Revision 1
Front Panel Operation MN-CDM710G
6–19
If Rx Demod: Æ Eq is selected:
Rx Adaptive Equalizer:
Off On
( E)
The adaptive equalizer helps correct for linear distortion in the rest of the link. Linear distortion
includes amplitude and phase that would occur due to imperfect filtering effects, but it does not
include distortion due to non linear amplifiers. Select operation as
Off or On using the
W X
arrow
keys, then press
ENTER
.
If Rx Demod: Æ IQ-TP is selected:
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 pins on the Alarm
Connector that an oscilloscope is connected to monitor I and Q. Select
Pre-Eq or Post-Eq using
the
W X
arrow keys, then press
ENTER
.
If Rx Demod: Æ Pilot is selected:
Rx Demodulation Pilot:
Off
O n ( E)
This menu is
read-only
, as the demodulator automatically determines if the pilots are
On
or
Off
. Press
ENTER
or
CLEAR
to return to the previous menu.
If Rx Demod: Æ Scr (Descrambler ) is selected:
Rx Descrambling Index:
Gold-n = 000000 (
▲ ▼ E)
The Gold-n Index indicates the Physical Layer spreading sequence number, and can be set from 0 to
262,141 . The default setting is all 0 s.
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 the digit. Press
ENTER
when done.
(CONFIG:) Rx
Æ
Code
Code Rate: 1/2 3/5 2/3
3/4 4/5 5/6 7/8 8/9 9/10
This menu is
read-only,
as the demodulator automatically resolves the code rate. Press
ENTER
or
CLEAR
to return to the previous menu.