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Topic: Radio telephone

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	Portable radio telephone system - Patent 4790000
		A portable radio telephone system according to claim 2, wherein a plurality of antennas is disposed inside said building structure and frequency channels different from said frequency channels allocated to said small cellular area in which said local area is disposed are used for radio communication inside said building structure.
		A portable radio telephone system according to claim 2, wherein said local area disposed in one of said small cellular areas consists of a plurality of mini areas, and said antennas are disposed in said mini areas adjacent to one another and transmit and receive radio waves of mutually different frequencies.
		In the portable radio telephone system of the present invention, radio communication may be carried out between a private branch radio telephone system in one cell and a portable telephone set by use of frequencies different from the frequencies allocated to the cell.
	www.freepatentsonline.com /4790000.html (2827 words)

	Radio telephone system - Patent 4852148
		A radio telephone system according to claim 1, wherein the transmission of the position entry signal from the radio telephone set to the radio connector is performed in a timing generated on the basis of the ID number of the radio telephone set.
		A radio telephone system according to claim 4, wherein the transmission of the position entry signal from the radio telephone set to the radio connector is performed in a timing generated on the basis of the ID number of the radio telephone set.
		Also, instead of the position entry over signal from the radio channel control unit 11 to the radio connector 12 may be replaced by some means of polarity inversion of he line voltage or by sending a tone signal directly to the radio telephone set 13 or sending the tone signal as a code signal.
	www.freepatentsonline.com /4852148.html (3166 words)

	Radio Service Given Over the Telephone (1925)
		Radio reports of the world series ball games and of the actual election returns were heard by these radio telephone subscribers.
		Miss Ruth Fuegham is the radio telephone operator for the new system, and the entertainment of the subscribers is dependent upon her tuning in.
		If a person were speaking over a long distance line any interference from radio signals would be extremely annoying, as sometimes the connections made are not of the best and it is difficult to understand the person at the other end of the line.
	earlyradiohistory.us /1925fre.htm (1151 words)

	20. Financing Radio Broadcasting (1898-1927)
		Radio broadcasts -- simultaneous transmission to multiple locations -- are such an obvious development that it really doesn't make sense to try to identify any one person or station as the originator of the idea.
		By installing a wireless telephone transmission station on the roof, the music of singers and orchestra could be supplied to all subscribers who would have aerial wires on or near their homes.
		By mid-1925 there was starting to be a financial crisis for the radio group due to the increasing expenses of their broadcasting stations, and a committee was formed to study whether they could continue to support broadcasting operations without selling advertising.
	earlyradiohistory.us /sec020.htm (3911 words)

	Privateline.com Mobile Telephone History: Introduction
		Japanese manufacturers, although not first with a working cellular radio, did equip some of the first car mounted mobile telephone services, their technology equal to whatever America was producing.
		Radio thus requires a modulated signal within the radio spectrum, using a transmitter and a receiver.
		As we can tell already, and as with the telephone (internal link), a radio is an electrical instrument.
	www.privateline.com /PCS/history.htm (1436 words)

	AllRefer.com - cellular telephone (Electrical Engineering) - Encyclopedia
		cellular telephone or cellular radio, telecommunications system in which a portable or mobile radio transmitter and receiver, or "telephone," is linked via microwave radio frequencies to base transmitter and receiver stations that connect the user to a conventional telephone network.
		When a mobile telephone leaves one cell and enters another, the telephone call is transferred from one base station and set of transmission frequencies to the next using a computerized switching system.
		In many countries with inadequate wire-based telephone networks, cellular telephone systems have provided a means of more quickly establishing a national telecommunications network.
	reference.allrefer.com /encyclopedia/C/cellulart.html (306 words)

	The first voice radio-telephone call (Site not responding. Last check: 2007-10-09)
		Radio was no longer limited to telegraph codes, no longer just a wireless telegraph.
		As Morgan put it, "Radio receivers with sensitive, inexpensive crystal detectors, such as this double slide tuner crystal set, appeared as early as 1904, and were used by most amateurs until the early Thirties, when vacuum tubes replaced crystals.
		Now, telephone companies themselves had portable telephones before this, especially to test their lines, and armed forces would often tap into existing lines while their divisions were on the move, but I still think this is the first regularly occurring, authorized, civilian use of a mobile telephone.
	www.mobil.greenline.ru /siemens.html (1552 words)

	ARRLWeb: Welcome to Amateur Radio! (Site not responding. Last check: 2007-10-09)
		Ham radio operators use two-way radio stations from their homes, cars, boats and outdoors to make hundreds of friends around town and around the world.
		Some radio clubs offer ham radio licensing classes, or they can find a club volunteer to answer your questions.
		The Amateur Radio license examinations are administered by ham radio volunteers.
	www.arrl.org /hamradio.html (802 words)

	Privateline.com Telephone History: Page 7: 1921 to 1948
		Although telephones had been used in the White House for many years, the instrument did not reach the president's desk until the Hoover administration at the start of the Great Depression.
		Treating radio like a public utility, something like the railroads, it was thought a public agency could protect the public against monopoly practices and price gouging.
		Fearing its radio and submarine cable communications to Alaska might be intercepted by the Japanese, the United States built the line to provide a more secure communication link from Alaska to the United States.
	www.privateline.com /TelephoneHistory3A/TeleHistory3A.htm (1717 words)

	Radio Telephone / Mobile Radio Installation Guidelines
		Certain radio telephones or land mobile radios or the way in which they are installed may adversely affect vehicle operations such as the performance of the engine and driver information, entertainment and electrical charging systems.
		The following are general guidelines for installing a radio telephone or land mobile radio in General Motors vehicles.
		These guidelines are intended to supplement, but not to be used in place of, detailed instructions for such installations which are the sole responsibility of the manufacturer of the involved radio telephone or land mobile radio.
	service.gm.com /techlineinfo/radio.html (1120 words)

	The Radio Telephone Room
		The Radio Telephone Room was created in the postwar refit of the Queen Mary -- out of the port-side promenade deck writing room.
		The etched glass panels that were added over the starboard writing room depict the various modes of writing through the ages and those added over the port side writing room (the one that was converted into the Radio Telephone Room) depict the various modes of communications used through the age.
		The radio telephone room was available to first class passengers only to make ship-to-shore telephone calls and send telegrams.
	www.sterling.rmplc.co.uk /visions/rtrm.html (903 words)

	EE498 Project Final Report
		The final modification was to wire in a telephone socket and plug so that no permanent modification needed to be made to the telephone or the house wiring in order to use the device.
		When the telephone receiver is on hook, we measured the DC voltage to be 58Volts.
		When the telephone receiver is off hook, we measured the DC voltage of 6.8 Volts which will turn on the PNP transistor as explained in Basic Circuit Theory.
	www.ee.washington.edu /conselec/Sp96/projects/mst/final/fnlrpt.htm (1641 words)

	Radio Telephone Projects
		It is not a wise choice to buy a phone that has more features than what you really need as you will end up paying more for the phone that you really want or have to.
		HORIZONTAL RADIO was a further development of earlier simultaneous telematic projects of the 90s.
		During the 50?s and 60?s, first radio telephone networks were introduced for public customers in the...
	directhomephone.com /radio-telephone-projects.html (1022 words)

	Mobile radio telephone (EP0369110B1)
		The invention is based on the object of developing a known mobile radio telephone in such a manner that data losses due to unintentional operation of operating and input elements, particularly by switching- off the radio telephone, are avoided.
		Radio telephone arrangement with two memory modules and prioritization of their use
		Radio telephone system having a handset adapted to be removably connected and containing a NAM for storing a telephone number identifying the handset
	www.delphion.com /details?pn=EP00369110B1 (363 words)

	Radio Telephone (Site not responding. Last check: 2007-10-09)
		The z-1500 Radio telephone System (CTS) is the new generation of on-premise radio telephone, providing clear and reliable voice...
		Telephone Pioneer Amateur Radio Club - Amateur radio club active in the Ottawa area.
		Miss Ruth Fuegham is the radio telephone operator for the new system...
	directhomephone.com /radio-telephone.html (956 words)

	FCC - General Radiotelephone Operator License (PG) (Site not responding. Last check: 2007-10-09)
		A PG is required to adjust, maintain, or internally repair FCC licensed radiotelephone transmitters in the aviation, maritime, and international fixed public radio services.
		Element 1 - Basic radio law and operating practice with which every maritime radio operator should be familiar.
		The exam consists of questions from the following categories: operating procedures, radio wave propagation, radio practice, electrical principles, circuit components, practical circuits, signals and emissions, and antennas and feed lines.
	wireless.fcc.gov /commoperators/pg.html (319 words)

	[No title] (Site not responding. Last check: 2007-10-09)
		Radio paging, in existence since the 1950's, is one of the older forms of land-based mobile communications services.
		The data is transmitted by a lightweight monitor, via radio, to a sensitive receiving system with antennas generally installed in the ceilings of the hospital corridors.
		The radio service associated with these projects and programs depends on the use, and could be a combination of the mobile, radiolocation, radionavigation, radionavigation-satellite, fixed, and possibly broadcasting services in the near future.
	www.ntia.doc.gov /openness/sp_rqmnts/mobile1.html (16001 words)

	RTO - The Radio Telephone Operator
		Each combat platoon had at least three radios, or one per squad.
		While the radio was primarily a tool for communicating with other units, it could also be used to keep us up-to-date on events in the world beyond.
		AN/PRC-25 Radio, FM modulation, voice emissions, low band is 30 to 52.95 megahertz, high band is 53 to 75.95 megahertz, 920 channels available (with 2 preset channels).
	www.i-kirk.info /tales/vnr04.html (664 words)

	Where There Is No Telephone
		Six years of living in Zaire, where virtually no telephone link exists outside the capital city of Kinshasa, has made me appreciate what a precious commodity this is. The HF radio fills the crucial gap left by no telephone availability.
		This HF radio is no recent marvel of the modern electronics revolution, having been in use since before World War II.
		The aim of this book is to help present users of radio networks to make the best use of their existing facilities by improving their effectiveness and reducing the probability of failure as well as to give advice to future users before they plan and purchase a radio system.
	www.reliefweb.int /library/wtint/toc.html (1183 words)

	Radio Telephone
		The z1500 Radio Telephone System (CTS) is the new generation of on-premise radio telephone, providing clear and reliable voice communications throughout any workplace.
		Wireless radio telephone solutions are available for a variety of sites, from small nursing homes and aged care facilities through to large retirement villages, private and public hospitals, warehouses, corporate offices and hotels.
		The radio telephone repeater has two internal antennas, used for increasing the effective range of a base station in a certain direction.
	www.commtechwireless.com /radio_telephone.php (670 words)

	Further information on 'Radio Telephone'.
		If you're searching for the term radio telephone, browsing Connected Earth's website is likely to help you.
		The experience is a completely multi-media one, which gives you the power to choose from accessible stories, more in-depth exploration, images of exhibits in 3D, reminiscences in oral and written form from people who used to work in the telecommunications industry, film clips, and simple explanations or interactive animations of how technology works.
		Connected Earth is a good website to further your exploration of the term radio telephone.
	www.connected-earth.com /content/radio_telephone.html (281 words)

	AT&T News Release, 1994-10-05, New clock radio phone and two Design Line phones from AT&T (Site not responding. Last check: 2007-10-09)
		The clock radio telephone is targeted at customers who want additional features, such as 12-number memory, a mute button, last-number redial, lighted dial for easy dialing under all lighting conditions and snooze control.
		The AT&T Clock Radio Telephone 340 will be available at AT&T Phone Center stores and select retail outlets in mid-October at a price of $69.99.
		The Design Line Telephone 140 will be available at select retail outlets in November, and at AT&T Phone Center stores in January at a price of $24.99.
	www.att.com /news/1094/941005.cpa.html (302 words)

	Telephone Pioneer QSO Party (Site not responding. Last check: 2007-10-09)
		The Golden Gate and Golden Bear Chapters invite all Telephone Pioneer Radio Amateurs to participate in the 41th Annual Telephone Pioneer QSO Party.
		The Telephone Pioneer QSO Party is scheduled for December 3, 4 and 5, 2005, (the first full weekend in December).
		The Telephone Pioneer QSO Party does the same with all Amateur Radio Telephone Pioneers.
	members.aol.com /tpqso (456 words)

	Stubblefield Radio Trust - Nathan B. Stubblefield of Murray Kentucky- 1860-1928 / Photos courtesy of Special ...
		In 1902, Nathan's Wireless Radio Telephone™ offered instant broadcast contact with the push of a button across a one mile radius and was publicized "that one day, his wireless would be heard all the way to China".
		The American Wireless Telephone and Telegraph Co., 1899, was incorporated under the laws of the territory of Arizona on November 10, 1899, with a capitalization of five million dollars.
		But of all the stations on the air in the early 1920s, the one to stir the attention of the public and the industry alike was ATandT's WEAF in New York.
	smart90.com /stubblefieldradiotrust (2678 words)

	Telephone system. The World Factbook. 2003 (Site not responding. Last check: 2007-10-09)
		domestic: microwave radio relay, fiber-optic cable, and a domestic satellite system with 40 earth stations serve the trunk network; more than 110,000 pay telephones are installed and mobile telephone use is rapidly expanding
		general assessment: telephone facilities in the city of Djibouti are adequate as are the microwave radio relay connections to outlying areas of the country
		domestic: adequate telephone service for business and government, but the population is poorly served; domestic satellite system with 120 earth stations; extensive microwave radio relay network; considerable use of fiber-optic cable, coaxial cable, and mobile cellular service
	www.bartleby.com /151/fields/103.html (9766 words)

	Amazon.com: Conair CID-402 Clock Radio/Telephone with Caller ID: Electronics (Site not responding. Last check: 2007-10-09)
		The radio automatically goes on mute when the telephone is in use, and a battery backup ensures that you never miss an alarm.
		So, in conclusion, if you are buying a clock radio to be able to use the phone at night, to select a radio station, or even, (heaven forbid!) tell the time, this is not for you.
		One little drawback is that the sound quality of the radio is not as good as it could be, although the speakers are very loud.
	www.amazon.com /exec/obidos/tg/detail/-/B0001654WW?v=glance (1382 words)

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