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Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of light.
Radio waves
Radio waves are a form of electromagnetic radiation, created whenever a charged object (in normal radio transmission, an electron) accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum. In radio, this acceleration is caused by an alternating current in an antenna. Radio frequencies occupy the range from a few tens of hertz to a few hundred gigahertz.
| ELF - SLF - ULF/VF - VLF - LF/LW - MW - HF/SW - VHF - UHF - SHF - EHF Electromagnetic radio spectrum |
Electromagnetic spectrum and diagram of radio transmission of an audio signal.
Electromagnetic radiation travels (propagates) by means of oscillating electromagnetic fields that pass through the air and the vacuum of space equally well, and does not require a medium of transport (such as the aether). When radio waves pass an electrical conductor, the oscillating electric or magnetic field (depending on the shape of the conductor) induces an alternating current and voltage in the conductor. This can be transformed into audio or other signals that carry information. The word 'radio' is used to describe this phenomenon, and television, radio, radar, and cell phone transmissions are all classed as radio frequency emissions.
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Two Way Radio Equipment
Amateur :: Radio
Accessories :: Radios
Amateur Radios :: Radios
Alcatel-Lucent: Bring down the barriers
Thu, 04 Sep 2008 12:30:35 -0000
Ben Verwaayen’s talents will be sorely tested in his new roleAFTER Alcatel SA merged with Lucent Technologies Inc two years ago, almost the last thing the new company could afford to worry about was balancing the interests of its French and American parts. But although less than half of the combined group’s turnover comes from its home countries, Alcatel-Lucent failed to transcend its national origins. Two small, weak telecoms-equipment firms became one big, weak one, beset by low-cost competition from new Chinese rivals and struggling in a business that internet technology was changing beyond recognition. Worse, demand has been weakening across the industry. Appointing people on the basis of nationality rather than ability is never a good idea; in conditions like these, it spelled disaster.Cost savings either failed to materialise or were swallowed by falling prices; despite hacking 16,500 jobs from a workforce of 88,000, Alcatel-Lucent made losses for six consecutive quarters and its share price fell by more than half. At the end of July it said that Serge Tchuruk, its French chairman, and Patricia Russo, its American chief executive, would depart. This week their replacements were named: a French chairman, who lives in America, and a Dutch chief executive, who will be based in Paris. Both Philippe Camus and Ben Verwaayen have the personality and experience that could iron out the beleaguered telecoms group’s problems. ...
Alcatel-Lucent: Goodbye and adieu
Thu, 31 Jul 2008 12:10:21 -0000
The architects of a big telecoms-equipment merger decide to hang upWHEN Alcatel, a French maker of telecoms equipment, announced its plan in 2006 to merge with Lucent, an American rival, reactions were mixed. There was general agreement that bigger was better and that the combined firm would benefit from greater geographical reach. But there was also scepticism that its French and American managers would be able to get along. With good reason, it seems: on July 29th Alcatel-Lucent announced its sixth consecutive quarterly loss and the resignations of Serge Tchuruk, its French chairman, and Patricia Russo, its American chief executive. Their firm’s troubles stem in large part from its internal clash of cultures.This clash was an unhelpful distraction, given that the entire telecoms-equipment industry is suffering. The bonanza of 2000-05, when European operators upgraded their mobile-phone networks to new “third-generation” (3G) technology, is winding down. Sales growth is slowing, and even Ericsson, the industry leader, has seen its share price fall by 50% in the past year. Margins have also been squeezed by the rise of Huawei and ZTE, two Chinese firms. Their prices are sometimes 40-50% lower than those of Western vendors. ...
Tech.view: Home warriors
Fri, 25 Jul 2008 07:24:51 -0000
Telecommuters need more than e-mail and a broadband connectionTHE best thing about being a foreign correspondent is not having to commute to the office every day, attend dreary meetings, dress soberly, and generally get distracted from the nitty-gritty of doing the job. The worst thing is being out of touch with colleagues at head office, with little say over how your stories are treated. But if you can handle the patchy feedback and total lack of control, the freedom pays dividends in productivity and sheer job satisfaction.Being one of the most portable jobs on the planet, journalism provides a daily reminder that work is something you do, not some place you go to. For the past quarter of a century, your correspondent has smirked about the time and energy he’s saved through not having to travel to work. ...
Telecoms in Mexico: Slim’s pickings
Thu, 10 Jul 2008 13:30:55 -0000
More competition should help to drive down exorbitant phone chargesIT HAS become quaint, in the era of Skype and unlimited calling plans, to worry too much about the cost of phone calls. But it is a textbook case of the old saying: “Them as has, gets”. The well-connected executive can use any number of voice-over-internet services to make free calls; but the rural poor, if they have phones at all, must pay high rates. Perhaps nowhere is this more true than in Mexico, where Carlos Slim, by some estimates the world’s richest man, dominates the telecoms industry. He controls Telmex, which has 81% of the fixed-line market, and Telcel, which has 72% of the mobile market. In the first quarter of 2008 Telmex had a profit margin before interest, taxes, depreciation and amortisation of 48.7%; for Telcel the figure was 52.1%.This is well above the global average for telecoms firms of 35%, says Martin Lara, an analyst at Vector Casa de Bolsa, a research firm. Base tariffs have fallen in Mexico in recent years, but they do not include things like international calls or calls to mobile phones. Competition has not helped much, because smaller firms have been reluctant to undercut Mr Slim’s companies by very much—and high prices boost their profits, too. “No one wants to destroy these profits overnight,” says Mr Lara. ...
BBC News | Business | World Edition
More turmoil hits Asian markets
Wed, 08 Oct 2008 00:26:42 -0000
Asian markets plummet in early trading after Wall St stocks closed at their lowest levels for five years.
IMF in 'severe downturn' warning
Tue, 07 Oct 2008 13:00:42 -0000
The global economic downturn is likely to worsen as the financial crisis continues, says the International Monetary Fund.
Tata announces new plant for Nano
Tue, 07 Oct 2008 13:12:24 -0000
India's Tata Motors is to build the world's cheapest car, the Nano, in Gujarat state following a row over land for its original site.
NYT > World Business
Two Countries Plan Rescues as European Leaders Continue to Talk
Wed, 08 Oct 2008 03:27:22 -0000
Britain and Spain moved to mount separate rescues of their financial industries, a move that comes at a time when European economic weakness gives signs of deepening.
European Disunion: Facing a Financial Crisis, Nations Put Self-Interest First
Wed, 08 Oct 2008 03:16:55 -0000
As the financial storm spread, some of the 27 nations that make up the European Union have broken ranks to protect their own citizens and banks.
Iceland, in a Precarious Position, Takes Drastic Steps to Right Itself
Wed, 08 Oct 2008 03:16:41 -0000
In addition to seeking a $5.5 billion loan from Russia, Iceland pegged its currency to an index and took control of one of its largest banks as it struggled to keep its economy afloat.
Acom - A privately owned company offering RF and audio equipment for commercial and amateur radio markets. Includes company and product information, product specifications and dealer locations.
Meta Description: [ Outstanding HF Power Products ]
Alinco, Incorporated - Radio information and product manuals, dealer locator, parts and service.
Meta Description: [ Alinco Electronics, amateur radio's value leader, sells high quality hand held and mobile transceivers ]
Ameritron - Amplifiers, antenna tuners, user manuals, photo tour, international dealer list.
Meta Description: [ Ameritron produces the best quality HF Amplifiers in the world. We have been making top quality ham radio amplifiers for over 20 years. Come look at our selection of fine products! ]
AOR U.S.A., INC. - Authority On Radio Communications, Inc. Manufacturer of receivers, frequency stabilizers, and related equipment.
Meta Description: [ AOR U.S.A., INC. ]
Barker and Williamson Antennas and Accessories - Manufacturers of the antennas and radio parts principally for the amateur market as well as military, commercial, and emergengy use.
Meta Description: [ Barker & Williamson - manufacturing military HF broadband folded dipole antenna for NVIS and ALE, emergency HF broadband folded dipole antenna for NVIS and ALE, commercial HF broadband folded dipole antenna for NVIS and ALE, amateur HF broadband folded dipole antenna for NVIS and ALE, fiberglas... ]
Bencher Inc. - Manufacturer of amateur radio paddles, keys, antennas and filters.
Meta Description: [ Manufactures of commercial duty copystands and tripods for imaging professionals ,high quality paddles, keys and antennas for the ham radio operator. ]
Blue's Radio Stuff - Sales of a selection of Citizen Band and Ham Radio equipment.
Meta Description: [ Your 1 Stop Shop for CB Radios, HAM Radios, and CB Accessories. ]
Cushcraft Corporation - Manufacture and develop communications antennas for the amateur and commercial markets.
Meta Description: [ Cushcraft Corporation, a world leader in the manufacture and development of communications antennas has been committed to total customer satisfaction for more than four decades. Cushcraft has become the world leader in antennas for Wireless LAN, ISM band, and small cell applications. Cushcraft al... ]
Eurofrequence Dierking NF/HF-Technik - Manufacturere and supplier of radio station accessories.
Meta Description: [ Adonis,Computermikrofon, microfoon, Dierking, Eurofrequence NF HF Technik Audio Filter Interface Soundkarte HV NV Netzteile Mikrofone Adapter ]
Expanded Spectrum Systems - Small electronics researcher, developer, and manufacturer located in Tampa, FL. Commercial and Amateur Radio sales and support.
F9FT - Radio amateur antenna and accessoires. Design, manufacture and selling of VHF/UHF amateur radio antennas and accessories.
Meta Description: [ présentation de la gamme d'antennes radio amateur F9FT - fiches techniques des antennes ]
FF Systems - Repeater controller products, featuring repeater controllers, digital voice recorder units, EPROMS, and manuals.
Force 12 - Manufacturer and distributor of amateur radio antenna systems and related commercial products.
Meta Description: [ Antennas and Towers ]
Galaxy Radios - Manufacturer of amateur radios, CB radios and accessories.
GAP Antenna Products, Inc. - Antennas and accessories for amateur radios. Photo and audio galleries, reviews, and list of dealers.
Meta Description: [ GAP Antenna Products, Inc., Manufactures of the Challenger, Titan, Eagle, Voyager, and the New Super C vertical HF antennas and accessories including the Quick-Tilt Mounts for the amateur radio community and more! ]
Hamtronics Inc. - Manufacturer of commercial and amateur VHF and UHF radio equipment.
Meta Description: [ Specialized VHF and UHF FM two way radio equipment for amateur and commercial radio applications. ]
Heil Sound Ltd. - Manufacturer of microphones, headsets and accessories for the amateur radio market.
Meta Description: [ microphones, a/v, audio, podcasting, amateur radio, heil, rock and roll, hall of fame ]
ICOM Worldwide - Information on ICOM products for the Amateur market.
Kenwood USA - Communications Division - Amateur Radio information, product registration and dealer locator.
Mirai Shuha Technologies LLS - Manufacturer of amateur and commercial radio station antennas, related equipment and accessories.
Meta Description: [ Mirai Shuha Technologies, LLS. Manufactured Radio Communications Equipment & Advanced Technical Services ]
N2RGA Antennas - Manufacturer of portable dual-band antennas.
Meta Description: [ N2RGA's Home of the double Zepp Antenna ]
NCG Company - Manufactures antennas, SWR meters and power supplies primarily for the Amateur Radio market.
New Communications Solutions - Designs and manufactures specialized multi-unit equipment for the amateur radio and communications markets.
Meta Description: [ New Communications Solutions designs, manufactures and sells specialized ham radio equipment to enhance the operations and capabilities of the amateur radio operator. ]
Pacific Research - Manufacturer of repeater controllers, tone panels and telephone interconnects..
Meta Description: [ Pacific Research is a manufacturer of Repeater Controllers, Repeater Tone Panels, Telephone Interconnect. Engineering services are also available from Pacific Research. ]
Pervisell Ltd. - Supplier of demodulators and related software as well as custom design and production services for electronic systems.
R. A. Kent Engineers - Designers and manufacturer of keys, paddles and bugs for transmission of Morse code and related modes.
Meta Description: [ KENT Morse Keys. Twin paddle, single paddle and hand morse keys with precision ball race bearings. Micro precision contact adjustment, available assembled or kit form. Morse code information for ham radio. ]
Spezialantennen BAZ Germany - German manufacturer of amateur antennas for UHF, VHF, and SHF.
Meta Description: [ Amateurfunk Antenne Richtantenne Richtantenne (n)
Yagi Richtfunk-Antennen Duoband-Antennen Yagi -Antennen von
Spezial Antennen BAZ ]
Stargun Antennas - Manufacturer and supplier of base and mobile antenna systems for HF to UHF.
Meta Description: [ Stargun Antennas has been around for more then 40 years. Looking for a CB or Ham antenna that can consistantly perform above your expectations. Don't forget about a our life-time warranty. ]
TD Communications - Specializes in amateur radio repair and service as well as fire and EMS radios.
Meta Description: [ amateur radio repair.kenwood, yaesu, Icom, radio repair, scanners. ]
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The Pouch, Inc. - Listing of ham HT radios and the pouch carrying cases which fit them. Link to amateur equipment dealers.
The Screwdriver.com - A screwdriver type mobile HF antenna capable of full legal power limit operation. Includes mount and digital controller.
Meta Description: [ The Screwdriver.com screwdriver antennas are the best built and best performing screwdriver antenna on the market, period! ]
The Vibroplex Company, Inc. - Manufacturer of telegraphy keys, bugs and keyers as well as spare parts and repair service.
Tokyo Hy-Power - Manufacturer of amplifiers and related equipment for the amateur market as well as RF power products for industrial, scientific, and medical applications.
VideoLynx - Manufacturer of high performance amateur radio video transmission equipment.
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