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  2. Signal generator - Wikipedia

    en.wikipedia.org/wiki/Signal_generator

    In June 1928, the General Radio 403 was the first commercial signal generator ever marketed. It supported a frequency range of 500 Hz to 1.5 MHz. [2] Also, in April 1929, the first commercial frequency standard was marketed by General Radio with a frequency of 50 KHz.

  3. AN/URM-25 signal generator - Wikipedia

    en.wikipedia.org/wiki/AN/URM-25_signal_generator

    The AN/URM-25 signal generator was an electronic vacuum-tube radio-frequency (RF) signal generator used during the 1950s and 1960s by the U.S. Military to test electronic equipment. History [ edit ]

  4. RF power amplifier - Wikipedia

    en.wikipedia.org/wiki/RF_power_amplifier

    A radio-frequency power amplifier (RF power amplifier) is a type of electronic amplifier that converts a low-power radio-frequency (RF) signal into a higher-power signal. [1] Typically, RF power amplifiers are used in the final stage of a radio transmitter , their output driving the antenna .

  5. Alexanderson alternator - Wikipedia

    en.wikipedia.org/wiki/Alexanderson_alternator

    The Alexanderson alternator works similarly to an AC electric generator, but generates higher-frequency current, in the very low frequency (VLF) radio frequency range. The rotor has no conductive windings or electrical connections; it consists of a solid disc of high tensile strength magnetic steel, with narrow slots cut in its circumference to ...

  6. Radio transmitter design - Wikipedia

    en.wikipedia.org/wiki/Radio_transmitter_design

    A radio transmitter or just transmitter is an electronic device which produces radio waves with an antenna. Radio waves are electromagnetic waves with frequencies between about 30 Hz and 300 GHz. The transmitter itself generates a radio frequency alternating current, which is applied to the antenna. When excited by this alternating current, the ...

  7. Function generator - Wikipedia

    en.wikipedia.org/wiki/Function_generator

    Arbitrary waveform generators may have distortion less than -55 dB below 50 kHz and less than -40 dB above 50 kHz. Some function generators can be phase locked to an external signal source, which may be a frequency reference or another function generator. Amplitude modulation (AM), frequency modulation (FM), or phase modulation (PM) may be ...

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