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| 1. |
The load current in the transmitting antenna of an unmodulated AM transmitter is 6 Amp. What will be the antenna current when modulation is 60%. |
| Answer» <html><body><p></p>Solution :Total power carried by AM wave <br/> `P_(T)=P_(<a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a>)(1+(m^(2))/(2))`…..(1) <br/>Where `P_(C)` is the power of carrier componenet and m is the modulation factor.If R is the resistance ,`I_(m)` the antenna <a href="https://interviewquestions.tuteehub.com/tag/load-11593" style="font-weight:bold;" target="_blank" title="Click to know more about LOAD">LOAD</a> current when modulation is <a href="https://interviewquestions.tuteehub.com/tag/60-328817" style="font-weight:bold;" target="_blank" title="Click to know more about 60">60</a>% and `I_(C)` Is the antenna load current when unmodulated ,then <br/>`(P_(T))/(P_(C))=(I_(m)^(2)R)/(I_(C)^(2)R)""therefore 1+(m^(2))/(2)=(I_(m)^(2))/(I_(C)^(2))` <a href="https://interviewquestions.tuteehub.com/tag/using-7379753" style="font-weight:bold;" target="_blank" title="Click to know more about USING">USING</a> (1) <br/>or `I_(m)=I_(C)<a href="https://interviewquestions.tuteehub.com/tag/sqrt-1223129" style="font-weight:bold;" target="_blank" title="Click to know more about SQRT">SQRT</a>({(1+(m^(2))/(2))})` <br/>Given `I_(C)`=6Amp,m=0.6 <br/>6[1.086]=6.52 Amp.</body></html> | |