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  2. Amateur radio repeater - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio_repeater

    The duplexer is a device which prevents the repeater's high-power transmitter (on the output frequency) from drowning out the users' signal on the repeater receiver (on the input frequency). A diplexer allows two transmitters on different frequencies to use one antenna, and is common in installations where one repeater on 2 m and a second on ...

  3. Homebrew (video games) - Wikipedia

    en.wikipedia.org/wiki/Homebrew_(video_games)

    Homebrew, when applied to video games, refers to software produced by hobbyists for proprietary video game consoles which are not intended to be user-programmable. The official documentation is often only available to licensed developers, and these systems may use storage formats that make distribution difficult, such as ROM cartridges or encrypted CD-ROMs.

  4. Magic tee - Wikipedia

    en.wikipedia.org/wiki/Magic_Tee

    The magic tee is a combination of E and H plane tees. Arm 3 forms an H-plane tee with arms 1 and 2. Arm 4 forms an E-plane tee with arms 1 and 2. Arms 1 and 2 are sometimes called the side or collinear arms.

  5. Homebrew Computer Club - Wikipedia

    en.wikipedia.org/wiki/Homebrew_Computer_Club

    The Homebrew Computer Club was an informal group of electronic enthusiasts and technically minded hobbyists who gathered to trade parts, circuits, and information pertaining to DIY construction of personal computing devices. [3] [self-published source] It was started by Gordon French and Fred Moore who met at the Community Computer Center in ...

  6. Microwave cavity - Wikipedia

    en.wikipedia.org/wiki/Microwave_cavity

    The cavities serve as resonators (tank circuits) to determine the frequency of the oscillators. A microwave cavity or radio frequency cavity (RF cavity) is a special type of resonator, consisting of a closed (or largely closed) metal structure that confines electromagnetic fields in the microwave or RF region of the spectrum.

  7. Duplex (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Duplex_(telecommunications)

    A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions. Duplex systems are employed in many communications networks, either to allow for simultaneous communication in both directions between two connected parties or to provide a reverse path for the monitoring and remote adjustment ...

  8. Injection mold construction - Wikipedia

    en.wikipedia.org/wiki/Injection_mold_construction

    These are generally used to produce plastic parts using a core and a cavity. Molds are designed as two-plate or three-plate molds, depending on the type of component to be manufactured. The two plate mold requires a single day in light, while the three plate mold requires two days.

  9. Core (manufacturing) - Wikipedia

    en.wikipedia.org/wiki/Core_(manufacturing)

    A diagram of chaplet usage Various types of chaplets. If Fub what is it? ≤0, no chaplet is used. If Fub>0, chaplets is used. As mentioned earlier, cores are usually supported by two core prints in the mold. However, there are situations where a core only uses one core print so other means are required to support the cantilevered end.