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CDM-570/570L Satellite Modem with Optional IP Module Revision 4
Front Panel Operation MN/CDM570L.IOM
6–11
6.6 (CONFIG) ALL
The user is presented, in a sequential fashion, with every configuration option that is part
of the individual configuration menus.
6.7 (CONFIG) TX (Transmit)
Select FEC, Mod, Code, Data, Frq, On/Off, Pwr, Scram, Clk or Inv using the ◄ ►
arrow keys, then press ENTER. The user will then be taken to a further sub-menu. Each
of these choices is described briefly in the table below:
FEC
(Forward Error Correction) This sub-menu permits the user to select the
method of FEC used for transmission (Viterbi, TPC, etc). FEC type
takes the highest configuration priority.
Mod
(Modulation) This sub-menu permits the user to select the modulation
type used for transmission (BPSK, QPSK, 8-PSK, etc.). The choice of
modulation will depend on the FEC type chosen.
Code
(FEC Code Rate) This sub-menu permits the user to select the FEC Code
Rate used for transmission (Rate 1/2, Rate 3/4, etc.). The choice of Code
Rate will depend on both the FEC type and Modulation selected.
Data
(Data Rate) This sub-menu permits the user to select the transmit data
rate, in steps of 1 bps. The choice of data rate will depend on the FEC
type, Modulation, and Code Rate selected.
Frq
(Frequency) This sub-menu permits the user to select the transmit
frequency, in steps of 100Hz.
CDM-570L range: 950 MHz to 1950 MHz
CDM-570 range: 50 to 90 MHz and 100 to 180 MHz
On/Off
This sub-menu permits user to control the output state of the transmit
carrier.
Pwr
(Output Power level) This sub-menu permits the user to control the
output level of transmit carrier, either manually, or using the AUPC
(Automatic Uplink Power Control) feature.
Scram
(Scrambler) This sub-menu permits the user to select whether or not data
scrambling is used.
Clk
(Clock Source) This sub-menu permits the user to select the clock source
for transmission. This can be from the CDM-570L’s high stability
internal source, from an external source, or from the distant-end of the
satellite link (loop timed).
Inv
(Inversion) This sub-menu permits the user to invert the sense of the
transmitted spectrum, or to invert the sense of the transmitted baseband
data.
Tx:FEC Mod Code Data Frq
On/Off Pwr Scram Clk Inv