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  2. EmDrive - Wikipedia

    en.wikipedia.org/wiki/EmDrive

    At the China Academy of Space Technology, Yue Chen filed several patent applications in 2016 describing various radio frequency (RF) resonant cavity thruster designs. These included a method for stacking several short resonant cavities to improve thrust, [ 58 ] and a design with a cavity that was a semicylinder instead of a frustum. [ 59 ]

  3. AN/URM-25 signal generator - Wikipedia

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

    AN/URM-25 signal generator. URM-25 signal generator c. 1955. Uses. Aligning radio equipment. Manufacturer. Various, commissioned by U.S. military. Model. 25D. 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.

  4. Yaesu FT-101 - Wikipedia

    en.wikipedia.org/wiki/Yaesu_FT-101

    Yaesu FT-101. A Yaesu FT-101EE tuned to 7.180 (LSB) MHz. Many users left the protective plastic covering on to protect the face from scratching and dirt. Yaesu FT-101 is a model line of modular amateur radio transceivers, built by the Yaesu Corporation in Japan during the 1970s and 1980s. FT-101 is a set that combines a solid state transmitter ...

  5. Tektronix analog oscilloscopes - Wikipedia

    en.wikipedia.org/wiki/Tektronix_Analog_Oscilloscopes

    A Tektronix 465 portable analog oscilloscope is a typical instrument of the late 1970s. In the 1960s Tektronix introduced the relatively compact 450 series of portable oscilloscopes, starting with the 50 MHz 453. The 453 was superseded by the 454. There was also a 422 15 MHz AC/DC portable made.

  6. Baofeng UV-5R - Wikipedia

    en.wikipedia.org/wiki/Baofeng_UV-5R

    Baofeng UV-5R. Receiver only 20 mA, Transmitter 1 A max. The Baofeng UV-5R[note 1] is a handheld radio transceiver manufactured by the Chinese manufacturer Baofeng. This model was the first dual band radio (VHF/UHF) to be successfully distributed by a Chinese brand. [citation needed] It is inexpensive and relatively simple to use (though ...

  7. AN/PRC-77 Portable Transceiver - Wikipedia

    en.wikipedia.org/wiki/AN/PRC-77_Portable_Transceiver

    AN/PRC-77 Portable Transceiver. AN/PRC 77 radio and handset. Soldier using a PRC-77 (top) with the KY-38 "Manpack," part of the NESTOR voice encryption system that was used during the Vietnam War. U.S. Marine carrying a PRC-77 during a training exercise in 1989. AN/PRC 77 Radio Set is a manpack, portable VHF FM combat-net radio transceiver ...