Atec DDS200 User Manual
Appendix A: Specifications
This section contains the specifications for the DDS200 Digital Demodulation
System. All specifications are guaranteed unless labeled “typical.” Typical
specifications are provided for your convenience and are not guaranteed.
Specifications labeled with the n symbol are checked in the Performance Test
(PT) procedure in the service manual.
NOTE. Performance requirements are valid provided that the instruments are
operating within environmental parameters and have warmed up for at least one
hour.
T able A–1: Electrical Specifications
Characteristics Requirements Supplemental information
Overvoltage category CA T II
RF Input Connector: front-panel female type BNC
Frequency range 47 to 862 MHz
n
Level 100 V to 700 mV
Accuracy , typical " 3 dB
Impedance, typical 75
Return loss
n
Channel bandwidth, typical 8 MHz
IF Input
Level, typical 10 to 100 mV
Impedance, typical 50
Return loss (33 to 40 MHz)
n
IF Output
Level, typical 45 mV (93 dBuV)
Impedance, typical 50
Frequency, typical 36 MHz
Demodulator
Modulation modes
n
Pulse response roll-off factors 0.15, 0.20, 0.25,
1
Operation at 4, 128, and 256 QAM is not specified.
1
y 12 dB
(80 to 100 dBuV)
y 20 dB
4, 16, 32, 64, 128,
256 QAM
0.30
DDS200 Digital Demodulation System User Manual
A–1
Appendix A: Specifications
T able A–1: Electrical Specifications (cont.)
Characteristics Supplemental informationRequirements
Insertion loss (64 QAM)
Symbol rate, typical 1.5 to 7.0 MBaud When setting the symbol rate value, the accuracy should be to three
Symbol rate 6.9 MBaud
n
Equalizer Self adapting, selectable with freeze mode
Reed-Solomon decoder 204, 188 byte t=8, selectable
Bit error rate display range 10-3 to 10
Interleaving Forney , L=12
Energy dispersal IESS 309 to DVB specification
Internal Noise Generator (Option
B5)
Signal/Noise ratio, typical 12 to 62 dB
Resolution 0.1 dB
Filter selection Automatic conversion and correct setting of S/N ratio based on
Outputs
Parallel MPEG2 transport
stream
Standard LVDS (188 or 204 bytes), DVB-A010
Source impedance, typical 100
DC component, typical 1.25 V
Signal amplitude, typical 247 mV to 454 mV
Transmission link length
(Max)
Serial MPEG2 transport stream Connector: rear-panel female type BNC
Standard ASI
Source impedance, typical 75
DC component, typical 0 V
Signal amplitude, typical 0.9 V
Transmission rate, typical 270 Mbit/s Fixed
QAM serial data
(before Reed-Solomon)
Source impedance, typical 75
QAM serial clock output Connector: rear-panel female type BNC
Source impedance,
typical
1.5 dB
decimal places
-10
selected filter.
Connector: rear-panel 25-pin
Approximately 5 meters
p-p
Connector: rear-panel female type BNC
75
A–2
DDS200 Digital Demodulation System User Manual
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