Theory of Operation
SDM-9000 Satellite Modem
5–12
Rev. 4
I and Q
Nyquist Filter
Daughter-
board
Σ
A/D
A/D
Commutator,
Rate
Exchange,
Depuncture,
Ambiguity
Resolver,
Decoder
Order Detect
Soft
Decision
LUT
(SRAM)
Viterbi
Decoder
Viterbi
Decoder
Viterbi
Decoder
8-PSK Parallel
to Serial,
3 x 3 Barrel
Shifter,
x3 Parallel
Differential
Decoder,
Extended E
b
/N
0
Monitor
Digital Delay Line
3-Bit x 526 Deep
TTL
to
ECL
Clock Loop
Costas Loop
AOC/AGC
1/2 DDS
1/2 DDS
DAC
DAC
To RF Demod
PLL
( x 8 )
÷
2
I-OFFSET
Q-OFFSET
AGC
SYNTHREF
DATCLK/3
Local
M&C
To Host
M&C
20MHZREF
I
Q
From
RF Demod
To
Interface
DATCLK/3
DATA
3
6
6
6
2
3
Σ
PLL
SYMBCK
DIVIDER
(
÷
2,4,8,16)
13
I Channel
Offset
Control
OUT OF SYNC
3
3
3
SCLK
2/3 SCLK
EN13
AMB
Figure 5-4. Demodulator Block Diagram
Summary of Contents for SDM-9000
Page 2: ......
Page 5: ...8 Mbit s w IDR Figure 1 7 16QAM BER Performance Curves with Reed Solomon Filename T_ERRATA 3...
Page 8: ......
Page 27: ...SDM 9000 Satellite Modem Introduction Rev 4 1 5 Figure 1 3 SDM 9000 Block Diagram...
Page 42: ...Introduction SDM 9000 Satellite Modem 1 20 Rev 4 This page is intentionally left blank...
Page 64: ...Configuration SDM 9000 Satellite Modem 3 6 Rev 4 JP1 Figure 3 4 Interface PCB AS 3971...
Page 65: ...SDM 9000 Satellite Modem Configuration Rev 4 3 7 Figure 3 5 Interface PCB AS 4477...
Page 66: ...Configuration SDM 9000 Satellite Modem 3 8 Rev 4 JP1 JP6 JP7 Figure 3 6 Interface PCB AS 5618...
Page 70: ...Configuration SDM 9000 Satellite Modem 3 12 Rev 4 Figure 3 7 Nyquist Filter Installation...
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Page 87: ...SDM 9000 Satellite Modem Operation Rev 4 4 13 This page is intentionally left blank...
Page 104: ...SDM 9000 Satellite Modem Operation Rev 4 4 31 This page is intentionally left blank...
Page 107: ...Operation SDM 9000 Satellite Modem 4 34 Rev 4 This page is intentionally left blank...
Page 124: ...SDM 9000 Satellite Modem Operation Rev 4 4 51 Figure 4 17 RF Loopback Figure 4 18 IF Loopback...
Page 150: ...Theory of Operation SDM 9000 Satellite Modem 5 22 Rev 4 Figure 5 6 Interface Block Diagram...
Page 158: ...Theory of Operation SDM 9000 Satellite Modem 5 30 Rev 4 This page is intentionally left blank...
Page 186: ...Maintenance SDM 9000 Satellite Modem 6 28 Rev 4 This page is intentionally left blank...
Page 218: ...Options SDM 9000 Satellite Modem A 32 Rev 4 This page is intentionally left blank...
Page 242: ...Remote Control Operation SDM 9000 Satellite Modem B 24 Rev 4 ref SE_ command...
Page 254: ...Glossary SDM 9000 Satellite Modem g 6 Rev 4 This page is intentionally left blank...
Page 256: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...