To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

4,5
Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
Languages
Recent
Show all languages
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.
.
Leo
Newton
Brights
Milds

Amateur radio homebrew

From Wikipedia, the free encyclopedia

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. Some items can be home-brewed at similar or lower cost than purchased equivalents.

History

Early "homebrew" amateur radio transmitter
Early "homebrew" amateur radio transmitter

In the early years of amateur radio, long before factory-built gear was easily available, hams built their own transmitting and receiving equipment, known as homebrewing.[2] In the 1930s, 40s, and 50s, hams handcrafted reasonable-quality vacuum tube-based transmitters and receivers which were often housed in their basements, and it was common for a well-built "homebrew rig" to cover all the high frequency bands (1.8 to 30 MHz). After WWII ended, surplus material (transmitters/receivers, etc.), was readily available, providing previously unavailable material at costs low enough for amateur experimental use.[3]

Homebrewing was often encouraged by amateur radio publications. In 1950, CQ Amateur Radio Magazine announced a ‘‘$1000 Cash Prize ‘Home Brew’ Contest’’ and called independently-built equipment ‘‘the type of gear which has helped to make amateur radio our greatest reservoir of technical proficiency.’’ The magazine tried to steer hams back into building by sponsoring such competitions and by publishing more construction plans, saying that homebrewing imparted a powerful technical mastery to hams. In 1958, a CQ editorial opined that if ham radio lost status as a technical activity, it might also lose the privilege of operating on the public airwaves, saying, ‘‘As our ranks of home constructors thin we also fall to a lower technical level as a group’’.[4]

In the 1950s and 60s, some hams turned to constructing their stations from kits sold by Heathkit, Eico, EF Johnson, Allied Radio's Knight-Kit, World Radio Laboratories and other suppliers.[5]

Today, only a minority of hams own and operate completely homebrew or kit-built amateur stations. However, there are many new ham radio kit suppliers, and the "art" of homebrewing is alive and thriving.[2]

Practices

Workbench of "homebrew" enthusiast K6ESE
Workbench of "homebrew" enthusiast K6ESE

Homebrewing differs from kit-building in that "homebrew" connotes the process of constructing equipment using parts and designs gathered from varied and often improvised sources. Even the most skilled homebrewer may not have time or resources to build the equivalent of modern commercially made amateur radio gear from scratch, as the commercial units contain custom integrated circuits, custom cabinets, and are the end result of multiple prototypes and exhaustive testing. However, constructing one's own equipment using relatively simple designs and easily obtainable or junk box electronic components is still possible.[6] Homebrew enthusiasts say that building one's own radio equipment is fun and gives them the satisfaction that comes from mastering electronic knowledge.[7]

QRP homebrew

hand-built QRP transceiver
hand-built QRP transceiver

QRPers are ham radio enthusiasts known to use a power output of five watts, sometimes operating with as little as 100 milliwatts or even less. Extremely low power—one watt and below—is often referred to by hobbyists as QRPp. Commercial transceivers designed to operate at or near-QRP power levels have been available for many years, but some QRPers prefer to design and build their own equipment, either from kits or from scratch. Some have built miniature transmitters and transceivers into Altoids boxes and operate using battery power.[8] Popular QRP kit models include the Elecraft K2, KX1, and now KX3 and those produced by NorCal, Small Wonder Labs, and others. QRP activity can often be heard on 7.030 MHz.[9]

Homebrewing with vacuum tubes

Glowbug transmitter hand built by AI2Q
Glowbug transmitter hand built by AI2Q

"Glowbug" is a term used by US amateurs to describe a simple home-made tube-type radio set, reminiscent of the shortwave radio-building craze of the 1920s and 30s. Generally, any small, home-built tube-type transmitter or receiver may be referred to as a glowbug. The majority of glowbug transmitters are designed to be used in the CW radiotelegraphy mode. A number of radio amateurs also build their own tube receivers and AM voice transmitters.[9]

As late as the 1960s, glowbugs were part of many beginner ham stations because of their simple, tube-based designs. Glowbugs are popular among QRP enthusiasts and others with a penchant for constructing their own equipment. Enthusiasts may assemble glowbugs on steel chassis, tin cakepans, and wooden boards. Glowbug enthusiasts can often be heard communicating on the shortwave bands via CW using Morse code. Simple oscillators for this frequency can be built with common NTSC color burst oscillator crystals, which operate at 3.5795 MHz.[10]

See also

External links

Notes

  1. ^ Radio Terms and Abbreviations
  2. ^ a b H. Ward Silver (2006). The ARRL Ham Radio License Manual: All You Need to Become an Amateur Radio Operator. Technician]. Level 1. American Radio Relay League. pp. 1–. ISBN 978-0-87259-963-5.
  3. ^ Walter G. (1965), CQ; the Radio Amateur's Journal, 21 (7-12 ed.)
  4. ^ Kristen Haring (2007). Ham radio's technical culture. ISBN 978-0-262-08355-3.
  5. ^ Anthony A. Luscre (K8ZT) (December 27, 2002). "QRP Community: Construction -- Kits, Homebrew and Other QRP Projects". The National Association for Amateur Radio (ARRL). Archived from the original on 2003-01-14.
  6. ^ Joel R. Hallas (2015), The Radio Amateur's Workshop: Your DIY Gude for Ham Homebrewing, ARRL, ISBN 978-1-62595-048-2
  7. ^ Harris, Frank W. "CRYSTAL SETS TO SIDEBAND, HOME-BUILDING AMATEUR RADIO EQUIPMENT - CHAPTER 2" (PDF). CRYSTAL SETS TO SIDEBAND. Archived from the original (PDF) on 2007-09-27. Retrieved 2007-11-25.
  8. ^ Maloney, Dan. "How Low Can You Go? The World Of QRP Operation". hackaday.com. Hackaday. Retrieved 16 October 2019.
  9. ^ a b Richard H. Arland (16 August 2007). ARRL's Low Power Communication: The Art and Science of Qrp. American Radio Relay League. pp. 11–. ISBN 978-0-87259-104-2.
  10. ^ Nechaevsky, Andy. "Vacuum Tubes & HAM Radio: Glowing Bottles of Vintage Homebrew". Glowbugs Info. Retrieved 25 January 2020.
This page was last edited on 27 November 2020, at 05:58
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.