FORMUSWRTHYPHASCISPELPRGHDOC h PICP69LINP6Z BOXP6Z dOVLP6Z dSWCL@BlackWhiteRedGreenBlueCyanYellowMagentafSalmonwPeachUBrownellowLight GreenwwwGrey DarkOrangeݙVanillalowGrey LightIDXHIDXDSoftSansdTitleepz,IDXDSoftSansdBlank LinefIDXDSoftSansdLetter HeadergIDXDSoftSans dIndex EntryhTOCH TOCDSoftSansdTitlenz%TOCDSoftSans dBlank LineoTOCDSoftSansdZLevel 1pTOCDSoftSans dZLevel 2qTOCDSoftSerif dLevel 3rTOCDSoftSerif dhLevel 4sTOCDSoftSerif dvLevel 5tTOCDSoftSerif d*Level 6uTOCDSoftSerif dLevel 7vTOCDSoftSerif d8Level 8wIDXPSEC1 PTPAG3pA PRN3KBVtils:APPLICATIONS/FinalWriter/FWFonts/SWOLFonts/Serif/WŬWW~WW { dELX.FormulaText{WPASDSoftSansdDocument TitlePASDSoftSansdSection Namepz??PASDSoftSansdTopic Nameq{??PASDSoftSansdSub Topic 1r|??PASDSoftSansdSub Topic 2s}??PASDSoftSans dBodyPASDSoftSans dIndented BodyTOCP!rOUTPBIBPTOIPENDPDSP2PHHFDASoftSans dSoftSans dPNDASoftSans dSHPP6Z dGRMRStrictly.For Business Writing.For Casual Writing.Custom 1.Custom 2.Custom 3.IDXLConductorsTDINFFCOP3 W1l:W!FDTAWorchester Utils:APPLICATIONS/FinalWriter/FWFonts/SWOLFonts/Serif/FDTASoftSansW8W%YW$PWwLWW$oW$WtW_W$PW# W$WtW~GINF 9 RGINFxq ZBlackMagentaGINF SHD1PW1W1W1FPTMainTBDYRULENATTR dCHRSElectronic Servicing yr.1 pt.1ATTR dCHRS ATTR hdCHRS ATTR hdCHRS ATTR dCHRSLecture: 029 - tATTR [dCHRS ATTR hdCHRS ATTR hdCHRS ATTR hdCHRS ATTR hdCHRS Thurs. - 15ATTR hdCHRS - May ATTR hdCHRS- 1997RULEATTR hdCHRSRULEATTR xCHRSAM & FM TransmittersRULEATTR dCHRSRULEATTR dCHRSSound waves, which is air pressure variations against time, are changed into electrical waves of the same waveform by the microphone. This output is first amplified by the Audio Frequency amplifier (block A), whose output voltage is an enlarged copy of the microphone output. This amplified signal goes to the Amplitude Modulator (Block B). The modulator also receives another input from the Radio Frequency Oscillator (Block C) which is the carrier frequency. From the audio signal and carrier frequency the modulator will form an amplitude modulated wave, on which the signal is carried on the carrier frequency by variations in the amplitude of the carrier frequency depending the polarity and magnitude of the amplitude of the audio signal. If the signal is voltage is 0, the carrier amplitude remains unaltered. If the signal voltage amplitude is positive, the carrier amplitude increases proportionally, whereas if the signal amplitude is negative, the carrier frequency amplitude is reduced proportionally.RULEATTR dCHRSRULE!ATTR! dCHRS!The modulated signal and its side bands are then amplified with the Radio Frequency Power Amplifier (block D). the amplified output is fed into the aerial which launches the radio frequency into space. Blocks A, B, C and D are fed by a constant dc voltage from the power supply (block E). RULEATTR dCHRSRULEATTR dCHRSThe FM transmitter works on the same principle. The amplified audio signal is fed into the Frequency Modulated Oscillator, which produces a wave which its frequency increases when the audio signal is +ve, and decreases when the signal amplitude is -ve. The FM amplitude signal is then amplified by the Radio Frequency Amplifier, which amplifies carrier and side frequencies. This amplified FM modulated wave is finally transmitted by the aerial into space.RMSTRULEATTR dCHRSLMSTRULEATTR dCHRS