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Another way to improve image rejection is to convert the 9.000-MHz (or whatever frequency) first IF to a lower IF, known as the second IF. This is usually a frequency between about 50 kHz and 500 kHz. A standard second IF is 455 kHz. The resulting receiver is a double-conversion superhet. Sometimes the second IF is converted to a still lower frequency, called the third IF, usually 50 kHz. This is a triple-conversion superhet. The main advantage of using double or triple conversion, besides superior image rejection, is the fact that low IFs can be easily filtered to provide superior adjacentchannel rejection. Low IFs aren t practical with single-conversion receivers, because fIMAGE would be too close to fIN, and the front end could not adequately differentiate between them. This problem would be worst at the highest frequencies fIN.

5-V power pin System ground IN1 input pin IN2 input pin IN3 input pin IN4 input pin No connection No connection 5-V power No connection

Once the IF signal has been filtered and amplified, it passes through a detector. This is generally a product detector for CW, FSK, and SSB, a ratio detector or PLL for FM, and an envelope detector for AM. Following the detector, a DSP circuit might be used. This further enhances the S/N ratio, minimizing the number of printer or display errors, or clarifying the audio or video.

TABLE 2-2

Quiz 517 Finally, an audio/video amplifier is used to boost the level to whatever is needed to drive the speaker, teleprinter, monitor, or instrumentation at the receiver output.

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To program your Page-Alert, you simply apply power to the screw terminals and connect the Page-Alert via the serial cable to your personal computer and run the STAMP 2 editor program called STAMPW.EXE, provided on the CD-ROM supplied. The CD-ROM contains the editor program and the Page-Alert program. Once the STAMPW.EXE program is running, you simply load the PALERT.BS2 program (Listing 20-1) by pressing Alt-L. Once the PALERT.BS2 program appears on your computer screen, you will have to

Modulated light beams can be demodulated easily using photodiodes or photovoltaic cells, as long as the modulating frequency isn t too high. At audio frequencies, a circuit such as the one in Fig. 27-14 will provide sufficient output to drive a headset. This demonstrates the method by which fiberoptic signals are detected.

'PALERT.BS2 ' PAGE-ALERT 'identify variables flash VAR new_io_state VAR old_io_state VAR call_state VAR io VAR timer VAR 'identify constants OHPin CON TxPin CON Siren CON Lamp CON LEDPin CON recall_delay CON

For use with a speaker, another bipolar amplifier stage can be added following the stage shown. To increase the sensitivity of the receiver (that is, to allow reception of much fainter modulated-light beams), an FET stage can be added between the photovoltaic cell and the bipolar stage shown. Modulated-light experiments can be done with simple apparatus, costing only a few dollars. If reasonably large lenses and/or reflectors are used, line-of-sight voice communications can be had for distances up to several hundred feet, using circuits based on the transmitter of Fig. 26-17 and the receiver of Fig. 27-14. With additional amplification and very large reflectors, the range can be increased to several miles on clear nights. This could make a great science-fair project.

Compound Annual Return 3.80% 5.30% 5.80% 10.70% 12.50% Simple Average Annual Return 3.10% 3.90% 5.70% 6.10% 12.70% 17.30% Std. Dev. of Return 3.20% 9.40% 8.60% 20.20% 33.20%

Refer to the text in this chapter if necessary. A good score is at least 18 correct. Answers are in the back of the book. 1. The reflected wave in a radio signal: A. Travels less distance than the direct wave.

9 10 12 13 15 120

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