Comtech EF Data C5 - Manual (Page 87)

C5/K1/K3 Integrated Satellite Terminal System Specifications
Rev. 0 2–53
2.7.2.2 IDU Receive Specification
Refer to Table 2-32 for IDU receive specifications.
Table 2-32. IDU Receive Specifications
Parameters Specifications
IF Input Frequency Range 950 to 1450 MHz, in 100 Hz steps
IF Input Level
Desired Signal -135 dBm +10 log (Symbol Rate) minimum
-85 dBm +10 log (Symbol Rate) maximum
IF Input Composite Power:
Symbol Rate
> = 64 ks/s
< = 64 ks/s
Absolute Maximum
+40 dBc with respect to RX signal
+50 dBc with respect to RX signal
-5 dBm
IF Input Impedance 50
! % 10%
IF Input Return Loss
(950 to 1700 MHz) > = 10 dB at 50
!
RX-AUX Output Nominal 0 dB gain from IF Input
% 3 dB
Baseband Filtering EFData Closed, Comstream Closed, Fairchild Closed
Demodulation Coherent QPSK or BPSK
Acquisition Range 0 kHz to 70 kHz, programmable in 100 Hz increments, range is
rounded to nearest multiple of the opening symbol rate
Symbol Rate Range (variable) 4.8 to 2500 ks/s
Data Rate Range (variable)
QPSK
BPSK 4.8 to 4375 kbit/s, in 1.0 bit/s steps
2.4 to 1250 kbit/s, in 1 bit/s steps
Forward Error Correction Viterbi K = 7, 1/2, 3/4, 7/8 rate
Optional: Sequential K = 36, 1/2, 3/4, 7/8 rate
Optional: Reed-Solomon IESS 308/309 Concatenated 225.205 T = 10
Bit Error Rate:
Viterbi 1/2 Rate
Viterbi 1/2 Rate (with Reed-
Solomon) 1 x 10 -8 for Eb/N0 7.2 dB
1 x 10 -10 for Eb/N0 5.0 dB
Ambiguity Resolution Method Differential Decoder
Descrambling CCITT V.35 IESS modified, CCITT V.35 (EFD or CSC Closed), FDC,
2
15 -1 SYNC