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CDM-600L Satellite Modem
Front Panel Operation
IMPORTANT
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 a period of 10
seconds before the transmit carrier is inhibited. This time interval is fixed and the user
cannot change it.
IMPORTANT
Select each digit of the Tx frequency to be edited using the [←] [→] arrow keys. Edit the
value of the digit using the [↑] [↓] arrow keys. When editing is complete, press ENTER.
Note that the range is from 950 to 1950 MHz.
SPECTRUM INVERT should normally be in the OFF position. When in the ON
position, for all FEC types except BPSK, the Tx spectrum is inverted (which is the same as
reversing the direction of phase rotation in the modulator). In BPSK, the time-order of bits
out of the FEC encoder is reversed, to make the modem compatible with certain other
manufacturer's modems.
CONFIG: TX: POWER
OUTPUT POWER: MODE= MANUAL (MANUAL,AUPC)
OUTPUT POWER LEVEL = –10.0 dBm
If in Manual, and BUC Leveling is Off, select the parameter to edit using the [←] [→]
arrow keys.
Edit the output level mode, either MANUAL or AUPC, using the [↑] [↓] arrow keys.
Select each digit of the TX Power Level using the [←] [→] arrow keys. Edit the value of
the digit using the [↑] [↓] arrow keys. When editing is complete, press ENTER.
If AUPC mode is selected, the lower line changes:
Note: EDMAC, ESC++ or D&I++ framing must be enabled for AUPC to function.
OUTPUT POWER:
TARGET-EbNo/RANGE
RTI means RECEIVE/TRANSMIT INHIBIT. When selected, it will
prevent the TX carrier from being transmitted, until the demodulator is
locked.
Having this feature enabled does not affect the internal IF loopback
feature. But, be aware that if an external IF loopback is attempted
(connecting an external cable from the Tx IF output to the Rx IF input),
then this will not work! (The Tx carrier cannot turn on until the demod is
locked, and the demod cannot lock, because the Tx output is off. The net
result is that the demod will not lock, and the Tx carrier will not turn on.
USE THE RTI FEATURE WITH EXTREME CARE!
MODE = AUPC (MANUAL,AUPC)
ALARM/ACTION
6–9
Revision 2
MN/CDM600L.IOM
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