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Another phenomenon, sometimes useful in the measurement of electric currents, is the fact that whenever current flows through a conductor having any resistance, that conductor is heated. All conductors have some resistance; none are perfect. The extent of this heating is proportional to the amount of current being carried by the wire. By choosing just the right metal or alloy, and by making the wire a certain length and diameter, and by employing a sensitive thermometer, and by putting the entire assembly inside a thermally insulating package, a hot-wire meter can be made. The hot-wire meter can measure ac as well as dc, because the current-heating phenomenon does not depend on the direction of current flow. A variation of the hot-wire principle can be used by placing two different metals into contact with each other. If the right metals are chosen, the junction will heat up when a current flows through it. This is called the thermocouple principle. As with the hot-wire meter, a thermometer can be used to measure the extent of the heating. But there is also another effect. A thermocouple, when it gets warm, generates a direct current. This current can be measured by a more conventional, dc type meter. This method is useful when it is necessary to have a faster meter response time. The hot-wire and thermocouple effects are used occasionally to measure current at radio frequencies, in the range of hundreds of kilohertz up to tens of gigahertz.

Basic Components 322 Comparator Circuit 325 Connecting Devices 325 Construction of the System 326 Modes of Operation 331

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If you tune in an unmodulated carrier with an envelope detector, you won t hear anything. A keyed carrier might produce barely audible thumps or clicks, but it will be impossible to read the code. For detection of CW, it s necessary to inject a signal into the receiver a few hundred hertz from the carrier. This injected signal will beat against the carrier, producing a tone whose frequency is the difference between the carrier and injected-signal frequencies. The injected signal is produced by a beat-frequency oscillator (BFO). The beating occurs in a signal combiner or mixer. A block diagram of a simple CW receiver is shown in Fig. 27-5. The BFO is tunable. Suppose there is a CW signal at 3.550 MHz. As the BFO approaches 3.550 MHz from below, a high-pitched tone will appear at the output. When the BFO reaches 3.549 MHz, the tone will be 3.550 3.549 MHz, or 1 kHz. This is a comfortable listening pitch for most people. The BFO setting isn t too critical; in fact, it can be changed to get a different tone pitch if you get tired of listening to one pitch. As the BFO frequency passes 3.550 MHz, the pitch will descend to a rumble, then to a swish-swish sound. As the BFO frequency continues to rise, the tone pitch will increase again, eventually rising beyond the range of human hearing.

Setting Up and Operating the System 332 Identifying Network Location 333 Additional Software 334 Weblink Monitoring System Board Parts List 334 Web-Server Module Assembly Parts List 335 Threshold Comparator Board Parts List 335 Alarm Loop Input Circuit Parts List 336

506 Data reception This demodulation scheme is called heterodyne detection. A receiver that makes use of a heterodyne detector is called a direct-conversion receiver.

Don t Count Until You Discount WACC and Market Capitalization Estimating ConEd s WACC The Cost of Common Equity and Shares Outstanding The After-Tax Cost of Debt and Debt Outstanding The Cost of Preferred Stock and Amount Outstanding WACC Calculation ConEd WACC Calculation Cisco Balance Sheet Items in the Valuation Process: Our Recommendation Valuation Exercise: Cisco After the Cost of Capital The Next Step

Frequency-shift keying can be detected by using the same methods as CW detection. The carrier beats against the BFO in the mixer, producing an audio tone that alternates between two different pitches. The block diagram of Fig. 27-5 can therefore apply to FSK reception as well as to CW reception. With FSK, the BFO frequency is always set well above, or well below, both the mark and the space carrier frequencies. The offset affects the audio tone frequencies and is set so that certain standard pitches result. There are several sets of standard tone frequencies, depending on whether the communications is amateur, commercial, or military. To get the proper pitches, the BFO must be set precisely at the right frequency. There is little tolerance for error.

When the normally closed switch is pressed, an open condition causes the input to go low, i.e., to ground. This configuration would also be good for alarm monitoring systems, where a supervisory condition exists. The code for this configuration is as follows:

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