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CDM-700 High Speed Satellite Modem
Front Panel Operation
If Tx Output State
Rx–Tx
Inhibit (RTI)
IMPORTANT
If Tx Power
IMPORTANT
Tx Impedance (Ohms):
(
This menu is displayed only when the 70/140 MHz modulator is installed.
70/140 MHz
L-Band
Tx:
Scram
Tx Scrambling: Default-On
Off
Options are:
Default-On
Off
The options are displayed all of the time, but the ◄ ► arrow keys will force the cursor to skip
past an unavailable choice. Press
Rx-Tx_Inhibit is selected:
Prevents the Tx carrier from being transmitted, until the demodulator is locked.
To avoid the Tx Carrier from being turned Off when the demodulator loses
lock for a very short period of time, the demodulator must be unlocked
continuously for period of 10 seconds before the Tx carrier is inhibited. This
time interval is fixed.
With this feature enabled it will not affect the internal IF Loopback
feature. HOWEVER – if an external IF Loopback is attempted
(connecting an external cable from the Tx IF output to the Rx IF input),
then this feature will not function (the Tx carrier cannot turn On until
the demodulator is locked, and the demodulator cannot lock because
the Tx output is Off). The result is that the demodulator will not lock,
and the Tx carrier will not turn On.
USE THE RTI FEATURE WITH EXTREME CARE.
Imped is selected:
The Imped(ance) selection is only available when the 70/140 MHz
Modulator card is installed.
E)
Select 50 or 75Ω, using the
Not Applicable.
The proprietary scrambler is selected.
No Scrambling.
ENTER
50
75
◄ ►
arrow keys.
(
E)
.
6–16
Revision 5
MN/CDM700.IOM
Press
ENTER.
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