Đang tải... (xem toàn văn)
Tài liệu tiếng anh hướng dẫn bạn làm quen với điện tử,lập trình. Tài liệu này thích hợp cho người mới bắt đầu tìm hiểu về điện tử ,lập trình.
[...]... AM radio is broadcast, from a radio station to a receiver in your home, and how to build your own TRF or Tuned Radio Frequency AM radio receiver In Chapter 6, we will discover how FM radio works and how to build an FM radio with an SCA output for commercial free radio broadcasts 22 Radio Receiver Projects for the Evil Genius was created to inspire readers both young and old to build and enjoy radio and. .. loudspeaker for listening Figure 1-6 illustrates a block diagram of a typical AM radio receiver The antenna is sent to the RF amplifier The mixer is fed by both the local oscillator and the RF amplifier The signal from the mixer is sent to a bandpass filter and then on to the first IF amplifier The first IF amplifier is next sent to the detector and then on to the final audio amplifier stage which drives the. .. parts and radio kits which soon became available 2 Radio experimenters discovered that an amplitudemodulated wave consists of a carrier and two identical sidebands which are both above and below the carrier wave The Navy conducted experiments in which they attempted to pass one sideband and attenuate the other These experiments indicated that one sideband contained all the necessary information for voice... transmission The inventor most responsible for the modern day advances in radio systems was Edwin H Armstrong He was responsible for the Regenerative circuit in 1912, the Superheterodyne radio circuit in 1918, the Superregenerative radio circuit design in 1922 and the complete FM radio system in 1933 His inventions and developments form the backbone of radio communications as we know it today The majority... two sidebands with the carrier wave signal placed in the center between the two sidebands The transmission bandwidth of AM is twice the signal’s original (baseband) bandwidth—since both the positive and negative sidebands are ‘copied’ up to the carrier frequency, but only the positive sideband is present originally See Figure 1-3 Thus, double-sideband AM (DSB-AM) is spectrally inefficient The power... operating on the shortwave bands Types of receivers A radio signal is transmitted through the ionosphere and is picked up by the antenna in your radio receiver The antenna is fed to an RF amplifier and usually an intermediate amplifier or IF amplifier and then on to a detector of some sort depending upon the type of receiver you are using From the detector, the resultant audio signal is amplified and sent... display the satellite weather maps on the computer’s screen or save them later to show friends and relatives Chapter 24 discusses different analog to digital converters which you can use to collect and record data from the different receiver projects We hope you will find the 22 Radio Projects for the Evil Genius a fun and thought-provoking book, that will find a permanent place on your electronics or radio. .. speaker The illustration depicted in Figure 1-7 shows a typical FM receiver block diagram The antenna feeds the RF amplifier stage Both the RF amplifier and local oscillator are fed into the mixer The signal from the mixer is next sent to the IF amplifier stage From the IF amplifier stage the signal is next sent to the FM demodulator section, which feeds the signal to the voltage amplifier and then the. .. shortwave bands; you can hear their communications using different modulation techniques and even obtain a license to communicate in these bands yourself Contact the Amateur Radio Relay League for more information Table 1-3 illustrates the amateur radio frequencies and how they are divided between the different license classes On the shortwave band you will also encounter time signal stations and number... The 6-meter and 2-meter dual VHF Amateur Radio receiver in Chapter 12 will permit to discover the interesting hobby of Amateur Radio The 6-meter and 2-meter ham radio bands are two of the most popular VHF bands for technician class licensees You may discover that you might just want to get you own ham radio license and talk to ham radio operators through local VHF repeaters or to the rest of the world . 22 Radio Receiver Projects for the Evil Genius Evil Genius Series Bionics for the Evil Genius: 25 Build-it-Yourself Projects Electronic Circuits for the. Sensors for the Evil Genius: 54 Electrifying Projects 50 Awesome Auto Projects for the Evil Genius 50 Model Rocket Projects for the Evil Genius Mechatronics for