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There are two kinds of tubes: vacuum tubes and gas-filled tubes. Vacuum tubes are by far more common. Vacuum tubes allow electrons to be accelerated to high speeds, resulting in a large current. This current can be made more or less intense, or focused into a beam and guided in a particular direction. The intensity and/or beam direction can be changed with extreme rapidity, making possible a variety of different useful effects. Gas-filled tubes have a constant voltage drop, no matter what the current. This makes them useful as voltage regulators for high-voltage, high-current power supplies. Gas-filled tubes can withstand conditions that would destroy semiconductor regulating devices. Gas-filled tubes also fluoresce, or emit infrared, visible light and/or ultraviolet at well-defined wavelengths. This property can be put to use for decorative lighting. Neon signs are gas-filled electron tubes. In any electron tube, the charge carriers are free electrons. This means that the electrons are not bound to atoms, but instead, fly through space in a barrage, somewhat like photons of visible light, or like the atomic nuclei in a particle accelerator.

Many investment managers and advisors use simple averages to portray their historic performance. Simple averages are a misleading way to assess investment returns compound or geometric averages are far more representative of actual investment performance. Be careful when you read advertising material that bases performance records upon simple average returns. John Brennan, Chairman of the Vanguard Group, calls simple averages . . . the insidious math . . . of investing. Mr. Brennan says that, Once you lose big, it is very hard to catch up. 5 With simple averages, a larger percentage gain is required to offset a given percentage loss. For example, The Wall Street Journal reports

Xtal Osc and clock dividers Energy detect Mode control logic Receive filter and equalizer VBIAS Transmit filter and output buffer FSK demodulator Rx/Tx Data Re-timing FSK modulator

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Before the start of the twentieth century, scientists knew that electrons could carry a current through a vacuum. They also knew that hot electrodes would emit electrons more easily than cool ones. These phenomena were put to use in the first electron tubes, known as diode tubes, for the purpose of rectification.

In any tube, the electron-emitting electrode is called the cathode. The cathode is usually heated by means of a wire filament, similar to the glowing element in an incandescent bulb. The electron-collecting electrode is known as the anode or plate.

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that, between the NASDAQ high in March of 2000 and April 4, 2001, the Pro-Funds Ultra OTC Fund incurred a drop of 94.71 percent. So if Jim had an investment of $1000 in the Ultra OTC Fund in March of 2000, 13 months later it would have dropped to $52.90.6 A turnaround occurred between April 4, 2001 and May 2, 2001, and the Ultra OTC Fund rose an enormous 95.6 percent. Jim s $52.90 investment increased by 95.6 percent to $103.50 still down 89.65 percent below its March, 2000 high. The average return for these two unequal time periods is: ( 94.71 percent 95.6 percent) / 2 0.45 percent. The true return for Jim s 15-month holding period is 89.65 percent. In this example, we would guess that the difference in the calculation of average and actual returns qualifies as insidious. The following equation yields the percentage gain required to make an investment whole again after suffering a loss: Percentage Gain to Break Even 1 / (100% % drop)

In some tubes, the filament also serves as the cathode. This is called a directly heated cathode. The negative supply voltage is applied directly to the filament. The filament voltage for most tubes is 6 V or 12 V. The schematic symbol for a diode tube with a directly heated cathode is shown at A in Fig. 29-1.

The ubiquitous 3.579-MHz color burst crystal at X2 is the brain of the modem chip that controls all the timing functions. The crystal is connected to pins 1 and 2 of the MX604, with two 18-pF capacitors connected across the crystal with a tap to ground. A bias capacitor is connected from pin 9 to ground, and a second 0.01- F bypass capacitor is connected from Vdd to ground. Resistor R3 is connected from pin 15 to Vdd on pin 16. The MX604 chip as well as the real-time clock chip at U1 are powered from the 5-V regulator on board the main Data-Alert system board. Power to the modem is applied to pins 12 and 16, while ground is applied to pin 8. The alarm data, i.e., ASCII alarm information, from each Data-Alert channel is fed to the modem on the TXD pin 11. The FSK-modulated output signal is sent out of the modem on the TXOUT pin 7. The FSK output is next fed to R4, which is coupled to U3, which acts as an output amplifier and signal conditioner. The output from U3 is fed first to R6

29-1 Schematic symbols for diode tubes; C = cathode, F = filament, P = plate. At A, directly heated cathode; at B, indirectly heated cathode; at C, cold cathode.

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