## The Wireless Experimenter's Manual: Incorporating How to Conduct a Radio Club, Describes Parliamentary Procedure in the Formation of a Radio Club, the Design of Wireless Transmitting and Receiving Apparatus, Long Distance Receiving Sets, Vacuum Tube Amplifiers, Radio Telegraph and Telephone Sets, the Tuning and Calibration of Transmitters and Receivers, General Radio Measurements and Many Other Features |

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alternating current ammeter amperes amplifier antenna circuit antenna current apparatus audio bakelite binding posts bulbs buzzer capacity centimeters circuit of Fig coil L-l condenser C-l connected in series construction copper core coupling curve cycles decrement detector diameter dimensions disc electrodes employed experimenter farad filament formula goniometer grid condenser grid leak grid potential hard rubber head telephone high voltage impedance insulating L-l and L-2 loading coil magnetic Marconi Company Marconi V. T. maximum meters microhenries motor mounted number of turns obtained ohms operation oscillation circuit oscillation transformer plate circuit plate current primary and secondary primary coil quenched radio club radio frequency currents reactance reception rectifier regenerative regenerative circuit resistance resonance rotary gap secondary coil shown in Fig shunt signals spark gap suitable switch taps telegraphy terminals transmitter tuning Undamped Undamped Undamped vacuum tube valve variable condenser varied variometer volts wave length wavemeter winding wire wireless wound

### Popular passages

Page 39 - The effective value of an alternating current is sometimes called the "root mean square" (rms) value because the effective value of a sine wave is equal to the square root of the average of the squares of current taken at all points throughout the cycle.

Page 313 - It1, the decrement is calculated by A certain value of decrement therefore corresponds to that displacement of the condenser's moving plates which varies the capacity by the amount (Cr — C). The displacement for a given decrement will in general be different for different values of C, the total capacity .in the circuit. At each point of the condenser scale, therefore, any displacement of the moving plates which changes the square of current from /r2 to - /r2 means a certain value of (8

Page 308 - ... series with the antenna or in series with Ll, Cl, Rl. U is a source of undamped oscillations — a Marconi VT connected up for the production of radio frequencies. D is a damped oscillation spark set, the spark gap having magnesium electrodes. Switch S-2 connects L-2 to either source. TUBE GEN Fio.

Page 16 - The Commercial Tribune" in selling out to and supporting the Democratic ticket be, and the same is, hereby denounced. - "2. That it shall be the duty of the members of this committee to ascertain what, if any, Republicans subscribe to or patronize "The Commercial Tribune...

Page 366 - ... wires eliminated. Sparking is almost entirely eliminated, so that the energy lost in light and heat in the operation of other buzzers is here conserved and radiated in the form of oscillating energy. This buzzer maintains a constant note and is recommended as an exciter for checking wave-meters where pure note and ample energy are required.

Page 38 - It is now clear that a direct current, the square of which is equal to the average of the squares of an alternating current over a complete cycle, produces the same heat as the alternating current.

Page 299 - The frequency of an oscillation circuit may be calculated 1 from the relation n = where L is the inductance in henries, and C the capacitance in farads.