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+clc;
+//page no 204
+//prob no. 5.9
+//A direct FM transmitter with kf=2kHz/V & max deviatn of 300Hz.
+kf=2*10^3;tx_dev=300;
+disp('a)See fig.5.23 for this block diagram');
+f_mul=3*2*3;//3 stage freq multiplier with tripler doubler and tripler
+//b)Determination of max dev at oscillator 
+dev_o=5*10^3;//Deviation at o/p
+dev_osc=dev_o/f_mul;
+if  dev_osc < tx_dev then
+    disp('b)Transmitter is capable of 5kHz deviation');
+else
+    disp('b)Transmitter is not capable of 5kHz deviation')
+end;
+//c)Determination of oscillator freq
+fo=150;//carrier freq in MHz
+fosc=fo/f_mul;
+disp('MHz',fosc,'c)The oscillator freq is');
+//d)Determination of audio voltage for full deviation
+Vi_peak=dev_osc/kf;//dev at oscillator of 278Hz causes full 5kHz deviation
+//converting peak voltage to rms voltage
+Vi_RMS=Vi_peak/sqrt(2);
+disp('mV',Vi_RMS*10^3,'The audio RMS voltage is')
+\ No newline at end of file