Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7382208 | Operating method for the resonant operation of high-pressure lamps in longitudinal mode, and an associated system and electronic ballast The operating method is based on the simultaneous application of FM and AM. In this process, the fundamental frequency of the AM is derived from at least one, preferably the second, longitudinal mode. In continuous operation of the lamp, the color temperature is set... | 06/03/2008 |
| 6937108 | Methods and apparatus for offset chirp modulation A method and apparatus for producing a modulation scheme usable in conjunction with information transmission and reception via waveforms, such as electromagnetic waves. The modulation scheme is usable for such purposes as resolving range ambiguities and overcoming f... | 08/30/2005 |
| 5896182 | Amplitude modulator Amplitude modulator comprising a differential input pair receiving a modulating input signal, and a Gilbert cell multiplying a carrier signal by the modulating input signal; and a second differential pair of transistors receiving the carrier signal, and t... | 04/20/1999 |
| 5661442 | Amplitude control system having parallel integrating signal paths An amplitude control system uses a pair of parallel integrators to rapidly adjust the amplitude of a test signal between two precisely determined power levels in an RF signal generator. The amplitude control system initializes a first power level by switc... | 08/26/1997 |
| 5054116 | Feed-forward automatic level control circuit for a high-frequency source In a feedback loop level control circuit for an RF source, the RF output is sensed and compared to a reference level which determines the desired output power level. The difference between the output sample and the reference level constitutes an error sig... | 10/01/1991 |
| 4864635 | Amplitude modulated broadcast transmitter In an AM broadcast transmitter having a switching amplifier as main modulator (12), an additional modulator (18) is used in the radio frequency circuit in order to achieve a steady 100% modulation at the modulation minima, with the aid of which additional... | 09/05/1989 |
| 4633512 | Amplitude-modulated transmitter with controlled carrier value An amplitude-modulated transmitter wherein the carrier value (T) is controlled in accordance with an improved HAPUG (controlled-carrier) method. Increased energy saving with simultaneous increase of the signal-to-noise ratio at the reception site is achie... | 12/30/1986 |
