Viterbi Decoder/Demod Card As/0949 (Figure 6-8) - Comtech EF Data SDM-309B Installation And Operation Manual

SDM-309B Satellite Modem

6.1.4.4 Viterbi Decoder/Demod Card AS/0949 (Figure 6-8)

TPG
TP1
TP2
TP3
TPG
TP4
TP5
TP6
TP7
TPG
MN/U-SDM309B Rev. #
Ground Test Point.
Decoder Data. Data out of the decoder.
Decoder Clock. Clock out of the decoder.
Sync Error. Approximate raw error rate. Random TTL pulses. One pulse for every I
channel or Q channel error.
Ground Test Point.
I Channel Data. Result of the hard decision interface.
50% duty cycle random TTL data.
Symbol Clock. Result of the symbol clock recovery loop in the demod processor
Section.
Q Channel Data. Result of the hard decision interface.
50% duty cycle random TTL data.
Data Clock VCO. 8 MHz to 18 MHz TTL master clock for data clock generation.
Ground Test Point.
Figure 6-8
Maintenance
6-6–11