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Homebrew is an Amateur radio slang term for home-built, noncommercial radio equipment.[1] Amateur radio station with modern solid-state transceiver featuring LCD and DSP capabilities Amateur radio, often called ham radio, is both a hobby and a service that uses various types of radio communications equipment to communicate with other radio amateurs for public service, recreation and self-training. ...
History
Early "homebrew" amateur radio transmitter In the early years of amateur radio, long before factory-built gear was easily available, most hams built their own transmitting and receiving equipment, a process that came to be known as "homebrewing." In the 1930s, 40s, and 50s, hams hand crafted 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). Image File history File links No higher resolution available. ...
Image File history File links No higher resolution available. ...
Structure of a vacuum tube diode Structure of a vacuum tube triode In electronics, a vacuum tube, electron tube, or (outside North America) thermionic valve or just valve, is a device used to amplify, switch or modify a signal by controlling the movement of electrons in an evacuated space. ...
High frequency (HF) radio frequencies are between 3 and 30 MHz. ...
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,’’.[2] For other uses of the CQ acronym, see CQ. CQ Amateur Radio (also known simply as CQ or CQ magazine) is a magazine for amateur radio enthusiasts. ...
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.[3] Heathkits were products of the Heath Company, Benton Harbor, Michigan. ...
Eico (an acronym for Electronic Instrument Corporation) was a manufacturer of electronics kits located in New York City, New York, USA. EICO was established in New York City in 1945 to manufacture electronic test equipment in kit form. ...
A two-way radio manufacturer founded by its namesake, E.F. Johnson, in Waseca, MN in the early 20th Century. ...
Allied Radio was an American radio manufacturer and retailer, which sold radio sets, ham units, citizens band (CB) radios, and other communications equipment, as well as electronic components, through retail stores and via mail-order. ...
World Radio Laboratories, WRL, was a major supplier of amateur radio equipment from the 1950s through the 1970s. ...
Today, only a minority of hams exclusively 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.
Practices
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 ones own equipment using relatively simple designs and easily obtainable or junk box electronic components is still possible. Homebrew enthusiasts say that building one's own radio equipment is fun and gives them the satisfaction that comes from mastering electronic knowledge. [4] Image File history File links No higher resolution available. ...
Image File history File links No higher resolution available. ...
Portion of amateur station KF6PQTs junk box A Junk Box is a term used by Amateur radio operators to describe a collection of spare parts and old equipment kept to assist in building and repairing their station. ...
QRP homebrew
QRP Transceiver hand built by K6ESE 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 -- 1 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. Many build miniature transmitters and transceivers into Altoids boxes and operate using battery power.[5] Popular QRP kit models include the Elecraft K2 [6], and those produced by NorCal, Small Wonder Labs, and others. QRP activity can often be heard on 7.040 MHz. Image File history File links No higher resolution available. ...
Image File history File links No higher resolution available. ...
In amateur radio, QRP operation means transmitting at reduced power levels. ...
Altoids Wintergreen Altoids are a popular brand of breath mints that turn you into a flaming homosexual like Sammy Traverso and have existed since the turn of the 19th century. ...
Homebrewing with vacuum tubes
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. Classic glowbug designs from that era include the famous twin triode Doerle regenerative receiver and single-tube Hartley, TNT and TPTG transmitters. "Glow" refers to the glow of the vacuum tubes and "bug" to the gear's relatively diminutive size. 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. Image File history File links Ai2q. ...
Image File history File links Ai2q. ...
Simplified diagram of a triode. ...
The regenerative circuit (or self-regenerative circuit) allows a signal to be amplified many times by the same vacuum tube or other active component such as a field effect transistor. ...
Schematic diagram The Hartley oscillator is an LC electronic oscillator that derives its feedback from a tapped coil in parallel with a capacitor (the tank circuit). ...
A continuous wave (CW) is an electromagnetic wave of constant amplitude and frequency. ...
Telegraphy (from the Greek words tele = far away and grapho = write) is the long distance transmission of written messages without physical transport of letters, originally over wire. ...
As late as the 1960s, glowbugs were part of many beginner ham stations, and the ARRL Radio Amateur Handbook for those years exhibited a number of such simple, tube-based designs. Today, glowbugs are enjoying a resurgence of interest among QRP enthusiasts and others with a penchant for constructing their own equipment. A growing number of hams are "getting back to their roots" by assembling glowbugs on steel chassis, tin cakepans, and wooden boards, and putting them on the air. Amateur radio glowbug enthusiasts can often be heard communicating on the shortwave bands via CW using Morse code. A popular frequency to hear glowbug contacts is 3.579.5 MHz.[7] The American Radio Relay League (ARRL) was founded in May 1914 by Hiram Percy Maxim. ...
In amateur radio, QRP operation means transmitting at reduced power levels. ...
1922 Chart of the Morse Code Letters and Numerals Morse code is a method for transmitting telegraphic information, using standardized sequences of short and long elements to represent the letters, numerals, punctuation and special characters of a message. ...
See also Amateur radio station with modern solid-state transceiver featuring LCD and DSP capabilities Amateur radio, often called ham radio, is both a hobby and a service that uses various types of radio communications equipment to communicate with other radio amateurs for public service, recreation and self-training. ...
In amateur radio, QRP operation means transmitting at reduced power levels. ...
Vintage amateur gear at station W1GFH Vintage amateur radio is a subset of the amateur radio hobby, considered a form of nostalgia much like antique car collecting, where enthusiasts collect, restore, preserve, build, and operate amateur radio equipment from bygone years, most notably those using vacuum tube technology. ...
External links
Notes - ^ http://www.dxing.com/radioterms.htm
- ^ Ham radio’s technical culture, Kristen Haring. ISBN-13: 978-0-262-08355-3
- ^ http://www2.arrl.org/news/features/2002/12/27/1/
- ^ http://www.qsl.net/k3pd/chap02.pdf
- ^ http://www.qrpedia.com/wiki/Rock-Mite_Series
- ^ http://www.elecraft.com
- ^ http://webhome.idirect.com/~griffith/gb.htm
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