Comtech EF Data SDM-100A - Manual (Page 74)

Operation SDM-100A Satellite Modem
3–40 Rev. 0
Modulator Type Transmit Filter Type Select.
Allows operator to select INTELSAT Open, CSC Closed, FDC
Closed, or EFD Closed network filtering.
Encoder Type Select Viterbi or Sequential encoder type.
If the Sequential encoder firmware is not installed, the modem will
double beep, and not allow the selection change.
TX BPSK Ordering Select Standard or Non-standard TX BPSK ordering.
The normal operation is Standard TX BPSK ordering. If the
Receiver will not lock, selecting non-standard will invert the TX
BPSK ordering. In BPSK operation, this feature determines the
order of MUXing of the I and Q data.
Mod Spectrum Select Normal or Invert.
Programmable vector rotation. Allows the operator to select
Normal or Inverted (INVERT) for spectrum reversal of the I and Q
baseband channels.