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Table 8-5. TDRSS KaSA Return 225 MHz Service Signal Parameters
DG2 (notes 1, 3)
Parameter (Note 2) Description (Note 2)
Transmit carrier frequency (Hz) (note 4) F2
Carrier (F2) reference (Hz)
DG2 Noncoherent Customer platform oscillator
Data modulation (notes 1, 3) BPSK, SQPSK, or QPSK (refer to Appendix B
and Table 8-6)
Data format NRZ-L, NRZ-M, NRZ-S
Data rate restrictions
DG2
Total (notes 1, 2) 1 kbps - 300 Mbps
I channel 1 kbps - 150 Mbps
Q channel 1 kbps - 150 Mbps
I channel power
Q channel power
restrictions
Single data source-alternate I/Q bits 1:1
Single data source-alternate I/Q encoded
symbols
Revision 10 8-15 450-SNUG
1:1
Single data source-single data channel NA
Dual data sources 1:1
Notes:
1. Customer platform data configurations, including specific data rate restrictions for coding and
formatting, are defined in Table 8-6 for TDRSS KaSA return service (refer also to Appendix B).
Unless otherwise stated, the data rate restrictions given in this table assume uncoded and NRZ
formatted signals.
2. Unless otherwise noted, all data rate values are to be interpreted as data bit rates, and not as
data symbol rates.
3. Data rates and modulation schemes are based upon support through the KaSAR 225 MHz SN
ground terminal receivers. Other data rates and modulation schemes are possible through the
Ka-band 225 MHz and 650 MHz bandwidth IF services. Please refer to paragraph 8.3.6 and
contact GSFC Code 450 for further information.
4. The center frequency, f o , of the customer platform transmitter must be defined by the customer
MOC in its service specification code to an integral multiple of 10 Hz.