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  2. Active circulator - Wikipedia

    en.wikipedia.org/wiki/Active_Circulator

    An active circulator can be constructed using one of several different technologies. One early technology is the use of transistors as the active devices to perform the non-reciprocal function. [ 1 ] Varactor circuits are another technology, relying on a time-varying transmission line structure, driven by a separate pump signal. [ 2 ]

  3. Circulator - Wikipedia

    en.wikipedia.org/wiki/Circulator

    ANSI and IEC standard schematic symbol for a circulator (with each waveguide or transmission line port drawn as a single line, rather than as a pair of conductors). In electrical engineering, a circulator is a passive, non-reciprocal three- or four-port device that only allows a microwave or radio-frequency (RF) signal to exit through the port directly after the one it entered.

  4. List of amateur radio transceivers - Wikipedia

    en.wikipedia.org/wiki/List_of_amateur_radio...

    Kit Single band 80m / 40m / 30m / 20m 2 CW Yes Mosquita III Kit 40m 5 CW No [51] Nouveau 75A Kit 80M 5 (Carrier) / 20 PEP AM: Yes Splinter II Kit 40m 0.5 CW Yes OHR 100A Kit 80m / 40m / 30m / 20m / 15m 5 (4–4.5 on 15m) CW Yes BCR Blue Cool Radio Kit (80m) / 40m / 30m / 20m / 17m 5 CW No [51] QRPGuys DSB Digital Transceiver II Kit 40m / 30m / 20m

  5. UHF Follow-On satellite - Wikipedia

    en.wikipedia.org/wiki/UHF_follow-on_satellite

    Ultra High Frequency Follow-On (UFO) satellite system is a United States Department of Defense (DoD) program sponsored and operated by the United States Space Force to provide communications for airborne, ship, submarine and ground forces.

  6. 1994–1996 United States broadcast television realignment

    en.wikipedia.org/wiki/1994–1996_United_States...

    The logo of Fox Broadcasting Company from 1987 to 1993. Between 1994 and 1996, a wide-ranging realignment of television network affiliations took place in the United States as the result of a multimillion-dollar deal between the Fox Broadcasting Company and New World Communications, announced on May 23, 1994.

  7. UHF television broadcasting - Wikipedia

    en.wikipedia.org/wiki/UHF_television_broadcasting

    This mast has two UHF antennas for receiving signals from different directions. The lower antenna is a bowtie array. The upper antenna is a Yagi design. UHF television broadcasting is the use of ultra high frequency (UHF) radio for over-the-air transmission of television signals. UHF frequencies are used for both analog and digital television ...