Design the FSK modulator shown in Fig. 16.54(a) to produce frequencies of 1270 Hz and 1570 Hz corre- sponding to 1 (mark) and 0 (space), respectively.

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16.29 Design the FSK modulator shown in Fig. 16.54(a) to produce frequencies of 1270 Hz and 1570 Hz corre-
sponding to 1 (mark) and 0 (space), respectively.
1
1
Input
digital data
at 150 Hz
VI
Input
digital serial data
at 150 Hz
RB
10 ΚΩ
www
Rc
50 ΚΩ
Set at
39.24 ΚΩ
FSK
generator
1070-1270 Hz
(a) AM/FM transmitter
Q₁
2N404
RA
50 ΚΩ
Set at
41.51 ΚΩ
RB
47 ΚΩ
0.01 μF
HF
40
(b) Circuit
8
7
6
2
AM or FM
transmitter
Antenna
Vcc = +5 V
4
NE/SE-555 3
C₁
0.01 με
5
1070-1270 Hz
Vo
Transcribed Image Text:16.29 Design the FSK modulator shown in Fig. 16.54(a) to produce frequencies of 1270 Hz and 1570 Hz corre- sponding to 1 (mark) and 0 (space), respectively. 1 1 Input digital data at 150 Hz VI Input digital serial data at 150 Hz RB 10 ΚΩ www Rc 50 ΚΩ Set at 39.24 ΚΩ FSK generator 1070-1270 Hz (a) AM/FM transmitter Q₁ 2N404 RA 50 ΚΩ Set at 41.51 ΚΩ RB 47 ΚΩ 0.01 μF HF 40 (b) Circuit 8 7 6 2 AM or FM transmitter Antenna Vcc = +5 V 4 NE/SE-555 3 C₁ 0.01 με 5 1070-1270 Hz Vo
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