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The trouble with using simple on-off keying for RTTY is that noise pulses, such as thunderstorm static crashes, can be interpreted by the terminal unit as signal pulses. This causes misprints. There is no problem if a crash takes place during the full-on, or mark, part of the signal; but if it happens during a pause or space interval, the terminal unit can be fooled into thinking it s a mark pulse instead. This problem can be helped greatly by sending a signal during the space part of the signal, but at a different frequency from the mark pulse. Then the terminal unit knows for sure that a mark is not being sent. Instead of sending Not mark, the transmitter sends Not mark, but space instead. The easiest way to do this is to send the mark part of the signal at one carrier frequency, and the space part at another frequency a few hundred hertz higher or lower. This is FSK. The difference between the mark and space frequencies is called the shift, and is usually between 100 Hz and 1 kHz. A frequency-versus-time graph of the Morse code word eat, sent using FSK, is shown in Fig. 26-3. Normally, Baudot or ASCII, rather than Morse, is used for teleprinter operation. A block diagram of an FSK transmitter is shown in Fig. 26-4. The FSK mode,

Transformer T1 is used to couple the audio from the Tele-Alert to the phone line, once the unit has been triggered Resistor R9 is used to couple one side of the transformer to the phone line at J6, and also acts to hold the phone line The other secondary transformer lead is coupled to the phone line via C11 C11 is a blocking capacitor that keeps the phone off.

Frequency-shift keying 477 like on-off code keying, is a digital form of communications. But unlike on-off Morse keying, FSK is frequency modulation (FM).

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Teleprinter data can be sent over the telephone lines using FSK entirely within the audio range. Two audio tones are generated, one for mark and the other for space. There are three sets of standard tone frequencies: 1200 Hz and 2200 Hz for general communications, 1070 Hz and 1270 Hz for message origination, and 2025 and 2225 Hz for answering. These represent shifts of 1000 Hz or 200 Hz. Because this FSK takes place at audio, it is sometimes called audio-frequency-shift keying (AFSK). A device that sends and receives AFSK teleprinter over the phone lines is known as a telephone modem. If you ve used a personal computer via the phone lines, you ve used a telephone modem. Perhaps you ve heard the bleep-bleep of the tones as data is sent or received.

Principal assets are: investments, loans and receivables, cash and cash equivalents, trading account assets, inventories, goodwill, PP&E, and other assets From that total, we eliminated long-term fixed assets of PP&E $52 billion, and assets of questionable value, such as goodwill $222 billion, and other assets $66 billion, which gave us a short-term asset entry of $133682 billion Short-Term Liabilities Berkshire s principal liabilities are: losses and loss adjustment expenses, unearned premiums, accounts payable, repurchase and investment agreements, and trading account liabili-.

A voice signal is a complex waveform with frequencies mostly in the range 300 Hz to 3 kHz. Direct currents can be varied, or modulated, by these waveforms, thereby transmitting voice information over wires. This is how early telephones worked. Around 1920, when CW oscillators were developed to replace spark-gap transmitters, engineers wondered, Can a radio wave be modulated with a voice, like dc in a telephone If so, voices could be sent by wireless. Radio communications via Morse code was being done over thousands of miles, but CW was slow. The idea of sending voices was fascinating, and engineers set about to find a way to do it.

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An amplifier was built to have variable gain. The idea was to make the gain fluctuate at voice-frequency rates up to 3 kHz or so. Vacuum tubes were used as amplifiers back then, because solid-state components hadn t been invented yet. But the principle of amplitude modulation (AM) is the same, whether the active devices are tubes, bipolar transistors, or FETs. If bipolar transistors had been around in 1920, the first amplitude modulator would have resembled the circuit shown in Fig. 26-5. This circuit is simply a class-A RF amplifier, whose gain is varied in step with a voice signal coupled into the emitter circuit. The voice signal affects the instantaneous voltage between the emitter and base, varying the instantaneous bias. The result is that the instantaneous RF output increases and decreases, in a way that exactly duplicates the waveform of the voice signal. The circuit of Fig. 26-5 will work quite well as an AM voice modulator, provided that the audio input isn t too great. If the AF is excessive, overmodulation will occur. This will result in a distorted signal.

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