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A related noise contributor is from outside origins, such as a signal source, and is created by the same mechanism as above It is referred to as source noise, and can be calculated by: P NF = 10 LOG10 NO PNI where at 290K
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NF = noise figure, dB PNO = output noise power, W PNI = input noise power, W 290K = reference temperature used in most measurements, K
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CHAPTER
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Modulation
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ifferent modulation schemes have been adopted for the radio services, such as broadband amplitude modulation (AM) and frequency modulation (FM) for broadcast, narrowband FM for line-of-site two-way voice communications, single sideband (SSB) for long-distance voice communications via the ionosphere, and digital modulation for high-speed point-to-point or multipoint microwave radio communications links
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21 Amplitude Modulation
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Introduction
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Amplitude modulation is the earliest modulation method for wireless voice communications Not only is it very simple and cheap to work with from a hardware standpoint, but is still extensively used today for commercial and shortwave broadcast, as well as in certain citizen s band radios and a few ham radio systems
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212 AM Fundamentals
Modulation is the way we insert baseband information on an RF carrier wave The baseband information can be voice, digital data, analog video, and so on Demodulation is the procedure of extracting this baseband information, which is then sent to a speaker for voice and music, or on to digital circuits for processing or storage The most basic way we have of imprinting voice, data, or music on an RF carrier is by modulating the amplitude of this carrier (Fig 21) The unmodulated RF, which is produced by an oscillator, functions as the carrier that will transport the baseband modulation through space to a receiver The baseband is the intelligence always at a much lower frequency than that of the RF carrier that is inserted onto this carrier through nonlinear mixing of the two signals As seen in the time domain, the amplitude of the RF carrier is modified at the rate of the baseband s own amplitude and frequency variations In fact, if the amplitude of the baseband signal increases, then so will the amplitude of the RF carrier (Fig 22); while decreasing the baseband s amplitude decreases the amplitude of the carrier (Fig 23) The baseband modulation travels with the RF carrier to the receiver The receiver then takes these amplitude variations that are riding on the carrier and removes them, thus converting them back into the original audio amplitude variations that were inserted at the transmitter The recovered baseband is then amplified and fed into a speaker, or some other appropriate transducer The actual percent of modulation is what controls the final amplitude of the detected signal, and the higher the amplitude
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Two
FIGURE 21 (a) Baseband modulation at various amplitudes; (b) a carrier unmodulated and at various amplitude modulation percentages; (c) the demodulated waveform at baseband
FIGURE 22
(a) The baseband audio modulation; (b) the 100% AM-modulated RF waveform
of the baseband signal the higher the volume at the receiver s speaker, as shown in Fig 21 When the baseband signal is modulated at the transmitter, both the positive and negative alternations of the RF carrier will be influenced symmetrically This means that the missing negative alternation lost by the Class C collector modulation circuit will be recreated again by the tuned output tank of the transmitter s final amplifier, forming a mirror image of the positive alternation (Fig 24) Sidebands are formed by this modulation between a carrier and its baseband signal, which are viewable in the frequency domain as shown in Fig 25 These sidebands are created by the modulator s nonlinear mixing circuit producing sum (the upper sideband) and difference (the lower sideband) frequencies But it is the phase relationships between the RF carrier and the upper and lower sidebands that actually creates a new waveform that will deviate in amplitude in the time domain (Fig 26) This effect is produced when the two sidebands and the carrier are in phase, causing the amplitude of the modulated carrier waveform to be double that of the unmodulated carrier; and when the carrier and the two sidebands are completely out of phase, the amplitude of this new carrier waveform will be virtually zero The new waveform will therefore have high peaks and low valleys (Fig 27)
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