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2. Amateur radio homebrew - Wikipedia

   en.wikipedia.org/wiki/Amateur_radio_homebrew

   Homebrew is an amateur radio slang term for home-built, noncommercial radio equipment. [1] Design and construction of equipment from first principles is valued by amateur radio hobbyists, known as "hams", for educational value, and to allow experimentation and development of techniques or levels of performance not readily available as commercial products.

3. QRP operation - Wikipedia

   en.wikipedia.org/wiki/QRP_operation

   Enthusiasts operate QRP radios on the HF bands in portable modes, usually carrying the radios in backpacks, with whip antennas. Some QRPers prefer to construct their equipment from kits, published plans, [15] or homebrew it from scratch. Many popular designs are based on the NE612 mixer IC, i.e. the K1, K2, ATS series and the Softrock SDR.

4. Vintage amateur radio - Wikipedia

   en.wikipedia.org/wiki/Vintage_amateur_radio

   Vintage amateur radio is a subset of amateur radio hobby where enthusiasts collect, restore, preserve, build, and operate amateur radio equipment from bygone years, such as those using vacuum tube technology.

5. List of amateur radio transceivers - Wikipedia

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

   3–30 MHz (HF) 5–10 CW / SSB / wide band RX Yes BITX40 Kit 40m 7 SSB: No QCX / QCX+ / QCXmini [49] Kit Built for a single band 80m / 60m / 40m / 30m / 20m / 17m 5 CW: Yes QDX [50] Kit 80m / 40m / 30m / 20m 5 Digital modes (WSJT-X and JS8Call, primarily) Yes 2N2/40+ Homebrew 40m (mods for other bands) 2 CW N/A Small Wonder Labs SW+ Kit Single ...

6. Maritime mobile amateur radio - Wikipedia

   en.wikipedia.org/wiki/Maritime_mobile_amateur_radio

   An amateur radio installation on a 28' yacht, including 100W HF transceiver with microphone, manual antenna tuner, and morse key. Maritime mobile amateur radio is an amateur radio transmission license that allows maritime operators to install and use radio while they operating at sea. The call sign of operators is extended by adding the suffix ...

7. Quad antenna - Wikipedia

   en.wikipedia.org/wiki/Quad_antenna

   A quad antenna is a type of directional wire radio antenna used on the HF and VHF bands. A quad is a Yagi–Uda antenna ("Yagi") made from loop elements instead of dipoles: It consists of a driven element and one or more parasitic elements ; however in a quad, each of the loop elements may be square, round, or some other shape.