Comtech-ef-data SDM-300A User Manual download pdf (Page 379)

100

101

SDM-300A Satellite Modem Revision 6

Specifications MN/SDM300A.IOM

19–23

19.7 Acquisition Time

Refer to Table 19-20for acquisition time.

Table 19-20. Acquisition Time

Viterbi

6 dB E

with ± 35 kHz Frequency Uncertainty

Code Rate Data Rate T

acq

P(t < T

acq

)

1/2 < 9.6 kbps < 10 sec 95%

1/2

≥ 9.6 < 64 kbps

< 5 sec 95%

1/2

≥ 64 < 190 kbps

< 1 sec 95%

1/2

≥ 190 < 512 kbps

< 10 sec 95%

1/2

≥ 512 < 1000 kbps

< 2.5 sec 95%

1/2

≥ 1 < 2.5 Mbps

< 1 sec 95%

Sequential

6 dB E

with ± 35 kHz Frequency Uncertainty

Code Rate Data Rate T

acq

P(t < T

acq

)

1/2 2.4 < 4.8 kbps < 20 sec 95%

1/2

≥ 4.8 < 9.6 kbps

< 10 sec 95%

1/2

≥ 9.6 < 64 kbps

< 5 sec 95%

1/2

≥ 64 < 190 kbps

< 1 sec 95%

1/2

≥ 190 < 512 kbps

< 17 sec 95%

1/2

≥ 512 < 1000 kbps

< 2.5 sec 95%

1/2

≥ 1 < 2.5 Mbps

< 1 sec 95%

19.7.1 Receive IF Carrier Acquisition Range

The modem locks automatically to a correctly formatted carrier, which is within ± 35 kHz of

the displayed receive frequency. The operator can adjust the following:

Acquisition Range 0 to 70 kHz (in 1 Hz steps)

Center of the Acquisition Range -35 to +35 kHz (in 1 Hz steps)

19.7.2 Receive IF Carrier Reacquisition

The modem is programmed to delay the acquisition process upon loss of lock. This will

miniminize the acquisition time for a brief loss of the carrier. This delay can be programmed

from 0 to 999 seconds in 1-second steps.

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