.net pdf 417

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But is this indication of power the same as the power actually dissipated by the load at the end of the line Not necessarily. Recall, from the discussion of impedance, that any transmission line has a characteristic impedance. This value, Zo, depends on the size of the line conductors, the spacing between the conductors, and the type of dielectric material that separates the conductors. For a coaxial cable, Zo can be anywhere from about 50 to 150 . For a parallel-wire line, it can range from about 75 to 600 . If the load is a pure resistance R containing no reactance, and if R Zo , then the power indicated by the voltmeter/ammeter scheme will be the same as the true power dissipated by the load. The voltmeter and ammeter must be placed at the load end of the transmission line. If the load is a pure resistance R, and R < Zo or R > Zo, then the voltmeter and ammeter will not give an indication of the true power. Also, if there is any reactance in the load, the voltmeter/ammeter method will not be accurate. The physics of this is rather sophisticated, and a thorough treatment of it is beyond the scope of this course. But you should remember that it is always desirable to have the load impedance be a pure resistance, a complex value of R j0, where R Zo. Small discrepancies, in the form of a slightly larger or smaller resistance, or a small reactance, can sometimes be tolerated. But in very-high-frequency (VHF), ultra-high-frequency (UHF) and microwave radio transmitting systems, even a small impedance mismatch between the load and the line can cause excessive power losses in the line.

pens, the frequency spectrum of the wave is multifaceted. That means the wave energy is split up more or less equally among multiple frequencies.

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These systems are therefore characterized by bounded delays, because any station will only have to wait for the token for a certain amount of time Token-passing rings work as shown in Figure 4-23 When a station wants to transmit a file to another station on the LAN, it must first wait for the token, a small and unique piece of code that must be held by a station to validate the frame of data that is created and transmitted Let s assume for a moment that a station has secured the token because a prior station has released it The station places the token in the appropriate field of the frame it builds (actually, the medium access control [MAC] scheme, which is implemented on the NIC card that builds the frame), adds the data and address, and transmits the frame to the next station on the ring.

Power transmission 317 An impedance mismatch can usually be corrected by means of matching transformers and/or reactances that cancel out any load reactance. This is discussed in the next chapter.

An oscilloscope shows a graph of amplitude as a function of time. Because time is on the horizontal axis and represents the independent variable or domain of the function, the oscilloscope is said to be a time-domain instrument. But suppose you want to see the amplitude of a complex signal as a function of frequency, rather than as a function of time This can be done with a spectrum analyzer. It is a frequency-domain instrument. Its horizontal axis shows frequency as the independent variable, ranging from some adjustable minimum frequency (at the extreme left) to some adjustable maximum frequency (at the extreme right). An ac sine wave, as displayed on a spectrum analyzer, appears as a single pip, or vertical line (Fig. 9-7A). This means that all of the energy in the wave is concentrated at one frequency. But many, if not most, ac waves contain harmonic energy along with energy at the fundamental frequency. A harmonic frequency is a whole-number multiple of the fundamental frequency. For example, if 60 Hz is the fundamental frequency, then harmonics can exist at 120 Hz, 180 Hz, 240 Hz, and so on. The 120-Hz wave is the second harmonic; the 180-Hz wave is the third harmonic; the 240-Hz wave is the fourth harmonic; and so on.

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