Comtech EF Data SNM-1000 - Manual (Page 130)

SNM-1000 Node Control Modem Revision 3
Theory of Operation MN/SNM1000.IOM
4–12
ambiguities of the incoming data. When the decoder generates a lock signal, the
demodulator stops sweeping. If the signal level is within the operating range of the
demodulator, the modem declares lock.
Notes:
1. After the demodulator is locked, BER and frequency offset monitoring are
available via the remote interface.
2. For QPSK applications, the demodulator has the ability to lock to a carrier that
has gone through a spectral inversion.
4.3.2 Demodulator Specifications
Refer to Chapter 1 for specifications.