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Diffstat (limited to '1409/CH7/EX7.4/7_4.sce')
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1 files changed, 19 insertions, 0 deletions
diff --git a/1409/CH7/EX7.4/7_4.sce b/1409/CH7/EX7.4/7_4.sce new file mode 100644 index 000000000..6c5894406 --- /dev/null +++ b/1409/CH7/EX7.4/7_4.sce @@ -0,0 +1,19 @@ +clc;
+//page no 7-21
+//Example 7.4
+//Given transmitter frequency is 160MHz with a maximum deviation of 5.1kHz at a minimum audio frequency of 100Hz, initial phase modulation deviation is to be kept to less than 12 degrees
+ft=160;//transmitter frequency in MHz
+fd=5.1;//maximum frequency deviation in kHz
+fmin=100;//minimum audio frequency in Hz
+Of=100;//oscilltor frequency in kHz
+pd=12;//phase deviation in degrees
+pdmax=(12*%pi)/180;
+disp(+'rad',pdmax,'Maximum phase deviation of the modulator is ');
+fdmax=pdmax*fmin;
+disp(+'Hz',fdmax,'Maximum frequency deviation of the modulator is ');
+N=(fd*10^3)/fdmax;
+disp(N,'Frequency deviation increase required is ');
+//2^5=243; Therefore, the modulated waveform should be passed through a chain of 5 tripler stages to give final deviation of 5.1kHz
+//at a frequency of 100kHz*243-24.3MHz
+mixOf=ft-24.3;//Mixer oscillator frequency
+disp(+'MHz',mixOf,'Mixer oscillator signal is ');
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