User Manual Part 1

CIRCUIT ANALYSIS
MM101271V1 R2A 47
7.6.4.2 4800 Baud Narrow Band
This HSD filter circuit consists of operational amplifier U5C followed by operational
amplifier U5D. The output of U5D, Pin 14 is applied to the input of 8:1 MUX U7, Pin 5
(N02). This HSD amplifier filter output can be monitored at TP5.
Table 11 - 4800 Baud NB Filter Response
FREQUENCY RESPONSE
500 Hz 0 dB (ref)
10 Hz 0 dB ± 1 dB
1500 Hz 0 dB ± 1dB
3000 Hz -2 dB ± 1dB
3500 Hz -3 dB ± 1dB
10000 Hz <-20 dB
7.6.4.3 9600 Baud Wide Band ETSI
This HSD filter circuit consists of operational amplifier U10B followed by operational
amplifier U10A. The output of U10A, Pin 1 is applied to the input of 8:1 MUX U7, Pin 6
(N03). This HSD amplifier filter output can be monitored at TP6.
Table 12 - 9600 Baud WB ETSI Filter Response
FREQUENCY RESPONSE
1000 Hz 0 dB (ref)
10 Hz 0 dB ± 1dB
2000 Hz 0 dB ± 1dB
3600 Hz -2 dB ± 1dB
4600 Hz -3dB ± 1dB
12000 Hz <-20 dB
7.6.4.4 4800 Baud Narrow Band ETSI
This HSD filter circuit consists of operational amplifier U510C followed by operational
amplifier U10D. The output of U10D, Pin 14 is applied to the input of 8:1 MUX U7, Pin
7 (N04). This HSD amplifier filter output can be monitored at TP7.
Table 13 - 4800 Baud NB ETSI Filter Response
FREQUENCY RESPONSE
500 Hz 0 dB (ref)
10 Hz 0 dB ± 1dB
1000 Hz 0 dB ± 1dB
2300 Hz -2 dB ± 1dB
3000 Hz -3 dB ± 1dB
8000 Hz <-20 dB