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A single-sideband signal is really just an AM signal, minus the carrier and one of the sidebands. If the BFO frequency of a CW receiver is set exactly where the carrier should be, the sideband, either upper or lower, will beat against the BFO and produce audio output. In this way, the receiver of Fig. 27-5 can be used to detect SSB. The BFO frequency is critical for good SSB reception. If it is not set exactly at the frequency of the suppressed carrier, the voice will sound bizarre, like monkey chatter. A more advanced method of receiving CW, FSK, and SSB makes use of a product detector. This is a specialized form of mixer and is discussed a little later in this chapter.

ACTIVE LOW normally closed input switch or sensor sense: if in0 =0 then activate goto sense activate: debug "switch depressed" goto sense

Frequency-modulated or phase-modulated signals can be detected in several ways. The best FM receivers respond to frequency/phase changes, but not to amplitude changes.

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An AM receiver can be used to detect FM. This is done by setting the receiver near, but not exactly on, the FM signal. An AM receiver has a narrowband filter with a passband of about 6 kHz. This gives a selectivity curve such as that shown in Fig. 27-6. If the FM carrier frequency is near the skirt, or slope, of the filter response, modulation will cause the signal to move in and out of the passband. This will make the receiver output vary with the modulating data. Because this scheme takes advantage of the filter slope, it is called slope detection. It has two disadvantages. First, the receiver will respond to amplitude variations (because that s what it s designed for). Second, there will be nonlinearity in the received signal, producing distortion, because the slope is not a straight line.

In order to utilize the STAMP 2 to sense or control the outside world, you must change the direction of the I/O pins to tell the STAMP 2 that you would like to use a particular I/O pin as an output pin (see the manual on the CD-ROM) The STAMP 2 can control almost any type of device; however, it will supply only about 20 mA of current to an output device The STAMP 2 will drive an LED or optocoupler with no problem, but almost any other output device would need to be driven by a transistor The transistor acts a current switch that can control larger-current devices In Fig 2-5, the STAMP 2 turns on the LED when P0 goes low The cathode of the LED is sunk to ground through the output pin Figure 2-6 illustrates the STAMP 2 sourcing current to the LED.

If an FM signal is injected into a phase-locked loop (PLL) circuit, the loop will produce an error voltage that is a duplicate of the modulating waveform. The frequency changes might be too fast for the PLL to lock onto, but the error voltage will still appear. Many modern receivers take advantage of this effect to achieve FM detection. A circuit called a limiter can be placed ahead of the PLL so that the receiver does not respond to amplitude modulation. Thus, one of the major advantages of FM over AM is realized. Atmospheric noise and ignition noise cause much less disruption of a good FM receiver than to AM, CW, or SSB receivers, provided that the signal is strong enough. Weak signals tend to appear and disappear, rather than fading, in an FM receiver that employs limiting.

Save a Tree Use the Internet The Internet and Investment Information Cash Flow Valuation Inputs Easy to Find Cash Flow Valuation Inputs Requiring Estimation Cost of Capital Valuation Inputs Custom Valuations The Next Step Valuation Exercise: Cisco

The microprocessor in this example is sourcing current from the positive supply voltage through the LED to ground Some microcontrollers may not have enough sourcing current capacity, so a transistor may have to be used to drive an output The diagram in Fig 2-7 depicts an LED being driven by an npn transistor When pin P0 goes high, a current is caused to flow to the base of the 2N2222 npn transistor, thus effectively connecting the cathode of the LED to ground; this is known as sinking current to ground This example would be effective if you wished to turn on a high-current LED, or infrared LED, or other device that draws more current Figure 2-8 shows a similar application but uses a pnp transistor to drive a current device Note that the emitter of the transistor is connected to the plus supply voltage.

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