Comtech EF Data CDM-570 - Manual (Page 106)

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Front Panel Operation MN/CDM570L.IOM
5–20
5.2.2.1.3.10 (CONFIG: Tx) Inv (Inversion Functions)
Tx Inversion functions:
Spectrum Data (◄ ►,ENT)
Use the
◄ ► arrow keys to select Spectrum or Data, and then press ENTER.
(CONFIG: Tx) Tx Inversion functions: Spectrum
Tx Spectrum: Normal
Inverted (◄ ►,ENTER)
Use the
◄ ► arrow keys to select Normal or Inverted, and then press ENTER.
(CONFIG: Tx) Tx Inversion functions: Data
Tx Data Sense: Normal
Inverted (◄ ►,ENTER)
Use the
◄ ► arrow keys to select Normal or Inverted, and then press ENTER.
5.2.2.1.4 CONFIG: Rx (Receive)
Rx:FEC Dem Code Data Frq
Acq Descram Buf Inv EbNo
Use the
◄ ► arrow keys to select FEC, Dem, Code, Data, Frq, Acq, Descram, Buf, Inv, or
EbNo, and then press ENTER.
The submenu selections are summarized as follows:
Selection Sect. Description
FEC 5.2.2.1.4.1
(Forward Error Correction) Used to select the method of FEC used for
reception (Viterbi, TPC, etc.). FEC type takes the highest configuration priority.
Dem 5.2.2.1.4.2
(Demodulation) Used to select the modulation type used for reception (BPSK,
QPSK, 8-PSK, etc.). The choice of demodulation will depend on the FEC type
chosen.
Code 5.2.2.1.4.3
(FEC Code Rate) Used to select the FEC Code Rate used for reception (Rate
1/2, Rate 3/4, etc.). The choice of Code Rate will depend on both the FEC type
and Demodulation selected.
Data 5.2.2.1.4.4
(Data Rate) Used to select the receive data rate, in steps of 1 bps. The choice of
data rate will depend on the FEC type, Demodulation, and Code Rate selected.
Frq 5.2.2.1.4.5
(Frequency) Used to select the transmit frequency, in steps of 100Hz.
• CDM-570L range: 950 MHz to 2000 MHz
•
CDM-570 range: 50 to 90 MHz and 100 to 180 MHz
Acq 5.2.2.1.4.6
(Acquisition) Used to determine the amount of frequency uncertainty the
demodulator will search over in order to find and lock to an incoming carrier.