Channel Spacing/Adjacent Carrier Performance; Acquisition Time; Acquisition Probability; Receive If Carrier Acquisition Range - Comtech EF Data SNM-1001L Installation And Operation Manual

SNM-1001L Satellite Modem
Burst Mode Modulator Operation
C.4.11

Channel Spacing/Adjacent Carrier Performance

The modem bit error performance will be degraded less than 0.5 dB with the following receive
IF signal:
•
•
•
C.4.12

Acquisition Time

C.4.13

Acquisition Probability

C.4.14

Receive IF Carrier Acquisition Range

1. The modem will automatically lock to a correctly formatted carrier, which is within 4
2. The operator can adjust the acquisition range from 0 to 4 kHz, in 1 Hz steps.
3. The operator can adjust the center of the acquisition range from 0 to 8 kHz, in 1 Hz
Two like-modulated carriers spaced 1.3 times the symbol rate from the receive
frequency, and/or 1.2 times the acquisition range, whichever is larger.
Each adjacent carrier up to 10 dBc higher in power than the desired carrier.
A single adjacent carrier spaced 1.4 times the symbol rate, up to +20 dBc.
6 dB E b /N 0 with ± 4 kHz Frequency Uncertainty
Code Rate Data Rate
1/2 19.2 kbps
1/2 57.6
with ± 4 kHz Frequency Uncertainty
E b /N 0 Data Rate
6 dB 19.2 kbps
8 dB 19.2 kbps
6 dB 57.6 kbps
8 dB 57.6 kbps
kHz of the displayed receive frequency.
steps.
Viterbi
T acq P(t < T acq )
< 30 msec 93%
<11 sec 93%
Viterbi
T acq P(t < T acq )
< 30 msec 93%
< 30 msec 99%
<11 sec 93%
< 11 sec 99%
C–10
Revision 1
MN/SNM1001L.OM