Premier Mounts specifications CDM-600 Satellite Modem Revision Offset Qpsk Operation

CDM-600 Satellite Modem	Revision 7
Offset QPSK Operation	MN/CDM600.IOM

The two consequences of this are:

1.Acquisition may be longer, especially at low data rates.

2.The acquisition threshold is higher than for normal QPSK, although the demodulator will maintain lock down to its normal levels. For Firmware Versions prior to 1.3.1, the acquisition thresholds are as follows:

7.0dB Eb/No for Rate 1/2

5.2dB Eb/No for Rate 3/4

4.8dB Eb/No for Rate 7/8

4.0dB Eb/No for Uncoded operation (No FEC)

Firmware Versions of 1.3.1, or higher, have improved these figures by approximately 2-3 dB.

8–2