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Topic: Trunked Radio Systems

	Radio - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-11-05)
		Radio waves are a form of electromagnetic radiation, and are created whenever a charged object accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum.
		Radio was used to pass on orders and communications between armies and navies on both sides in World War I; Germany used radio communications for diplomatic messages once its submarine cables were cut by the British.
		Radio remote control: Use of radio waves to transmit control data to a remote object as in some early forms of guided missile, some early TV remotes and a range of model boats, cars and aeroplanes.
	encyclopedia.worldsearch.com /radio.htm (3622 words)

	Land Mobile Spectrum Planning Options - APPENDIX
		Radio users not belonging to a given talk group would be unaware of any activity on that talk group, except for the possible consequence of general crowding on the system (which we have already shown would be very small).
		Trunked single-site or multisite systems can be shared among a mix of users, with each type of user having an appropriate set of talk groups and priorities.
		A total of 2400 radio users have asked for permission to be placed on the system, but funds to purchase new radios compatible with system operation have limited the use of the trunked system (cost: $1500-2500 apiece).
	www.ntia.doc.gov /osmhome/reports/slye_rpt/appendix.html (4723 words)

	Trunked Radio (Site not responding. Last check: 2007-11-05)
		Trunked radio systems are used whenever a large number of mobile radios need to share radio frequencies.
		In a trunked radio network, a large number of workgroups can share fewer channels because the trunking equipment dynamically allocates an available channel when users key their radio.
		Trunked radio system operators cover a spectrum of companies from operations that serve a local region to international companies competing with cellular service.
	www.zetron.com /pages/trunk (215 words)

	Trunked Radio Systems (Site not responding. Last check: 2007-11-05)
		Trunked radio systems are those which share a small number of radio channels among a larger number of users.
		Radio channels were shared since the early days of radio.
		When a trunked radio user wishes to talk with someone on the same logical channel, she simply presses the microphone (PTT) button.
	home.earthlink.net /~lrkn/trunk.htm (549 words)

	National Radio Data, trunked scanner frequencies, amateur, ham, call signs and more.
		Trunked public radio systems are increasingly the norm in the United States.
		Digital trunked systems cannot be monitored by scanners which are capable of receiving analog-only systems.
		Digital trunking systems are legal for scanning enthusiasts to monitor as long as the transmissions are not scrambled or encoded for security purposes.
	www.nationalradiodata.com /resources-typesoftrunked.html (508 words)

	Scanning Trunked Systems by Ben Saladino KC5IRJ
		Each radio in the trunked system monitors the control channel to determine what frequency is currently assigned for the active channel on the radio.
		Trunked radio systems started out on 800 Mhz frequencies and are now showing up in the 900 Mhz range, and the federal government is even going trunked in their 400Mhz band for some departments.
		I normally leave delays turned off in my trunked system banks, because it's unlikely that when a transmission ends, the reply to it will be on the same frequency, so continuing to scan immediately seems more logical to me than waiting a second or two, but that's debatable too.
	www.bensware.com /scandfw/trunked.htm (1581 words)

	Logic Trunked Systems
		Other trunking systems allow their mobiles to attempt access even when every channel is full, further congesting the control channel.
		If the system is very busy and the channel is released right away, a second conversation may take the channel and a person trying to respond in the first conversation will not be able to answer, since all the channels would be in use.
		LTR systems are not nearly as popular with scanner listeners as Motorola or even EDACS, and it is often very difficult to determine exactly who is using the system.
	www.signalharbor.com /ttt/00may (1816 words)

	RA341 - Trunked Radio Systems - An outline to application
		Trunking is a spectrally efficient method of utilising a number of individual channels in a cohesive system of radio traffic management.
		Applicants requesting trunked assignments are required to submit to the Agency a full technical description of their requirements, both current and future, including statistical details of likely traffic levels.
		The installation should be engineered to provide a system which is at least as efficient as that described in the protocol MPT1327 "A Signalling Standard for Trunked Private Land Mobile Radio Systems".
	www.ofcom.org.uk /static/archive/ra/publication/ra_info/ra341.htm (612 words)

	TRUNKED SYSTEMS OF RADIO COMMUNICATIONS IN RUSSIA
		Over a relatively short period, trunked systems changed from a supplementary means of industrial management to an important constituent of Russia's infrastructure, with a growing range of applications.
		Trunked systems of radio communications are widely used all over the world in operative (police and emergency services) and industrial communications systems.
		Trunked systems are widely used by those commercial enterprises and state organization whose users are at a distance from each other, e.g.
	www.bisnis.doc.gov /bisnis/isa/9903RDIO.HTM (1556 words)

	[No title] (Site not responding. Last check: 2007-11-05)
		If Car 1 wants to talk to Car 2, the computer system switches the radios in Car 1 and Car 2 to the correct frequencies in order to use a repeater that is "open for business"/"free"/"available"/"not in use at the moment".
		Trunked radio systems typically have 5 or 10 or 20 repeaters at each hilltop site.
		Conventional channel - a non trunked radio channel - the type of radio channels you used to have before you moved up into the brave new world of trunked radio systems.
	www.geocities.com /45peter/trs.html (296 words)

	The only magazine devoted ENTIRELY to scanning
		If the TRS (Trunk Radio System) has DEDICATED frequencies specifically for use as a phone patch, or for mobile data terminals, there can be more that 28 frequencies in use, but only 28 of them will be used by the TRS.
		If your system is not a Motorola trunked system then the Trunktracker can only scan the frequencies in the conventional mode (with lots of beeps, buzzes and missed conversations).
		You should have less than 30 repeater frequencies in your system (no less than 3 frequencies will be in use in a trunked system) If you have more than 30 frequencies, then you may have two systems assigned to the same license, but used for two diffrent services.
	www.scanningusa.com /trunked_info/tipsandtricks.html (4477 words)

	Ham Radio Forum :: View topic - Trunked radio systems (Site not responding. Last check: 2007-11-05)
		Trunked radio systems are similar in operation to a multi-phone line telephone system.
		Ham radio, by nature, tends to be more of a community thing than private.
		Of course, the majority of hams will not have the trunking equipment for a while yet, so trunking will just be another band for those who have the equipment.
	www.hamforum.com /viewtopic.php?t=407 (984 words)

	Motorola Trunked Radio Systems (Site not responding. Last check: 2007-11-05)
		Motorola trunked radio system have a channel assigned as the control channel.
		When a radio is turned-on, it searches those four frequencies for the data stream.
		Since the controller can tell the radio to go to any channel in the band, adding/changing channels can be done at the controller without re-programming all the radios.
	home.earthlink.net /~lrkn/mot.htm (238 words)

	Networks - Tait Electronics - Radio Communications (Site not responding. Last check: 2007-11-05)
		Tait is a leading supplier of radio systems technology, with more than 300 systems in use around the world.
		Tait is the world's largest supplier of trunked radio systems based on MPT 1327, the most widely used open protocol technology.
		Trunking - computer controlled access to a pool of radio channels - provides optimum channel access for work groups of individuals placing one-to-one calls.
	www.taitworld.com /main/index.cfm/11,html (239 words)

	[No title]
		Trunking is a computer controlled system whereby groups of users with a common interest can share a radio system.
		Trunked radio systems are different From conventional radio systems in several key respects.
		In call setup the mobile contacts the system on the control channel and a traffic channel isn't allocated for the call until the B party answers (this is the main difference from cellular).
	plaws.net /scan/txt/trnk05.txt (7837 words)

	Trunked Radio Systems Guide CD (Site not responding. Last check: 2007-11-05)
		Trunked radio systems are the choice for local and state governments installing up-to-date radio systems for the new millenium.
		This guide lists analog and digital Motorola, EDACS and LTR trunked radio systems used by local, state and federal government agencies across the United States and Canada.
		Systems are listed by county within each state, giving frequencies and talkgroups, as well as fleet maps where applicable.
	www.universal-radio.com /catalog/cd/4531.html (90 words)

	Standard Public Safety Trunked Radio Systems
		Public safety system is a generic term, which combines various means of communications used by law enforcement, first responders and other similar agencies.
		This report is dealing only with type of public safety systems – trunked radio, which is the most popular due to the richness of the features and cost efficiency.
		The key to network and radio interoperability and success of public safety systems are maturing radio communications standards known as Project 25, or P25 for short, which gained exclusive popularity in the U.S, and TETRA, which was developed by ETSI in Europe and spread around the world.
	www.igigroup.com /st/pages/homeland.radio.html (428 words)

	mpt1327
		So it tells it that its registration has been rejected and this radio is unable to use this trunked system.
		What this means is that if someone calls ident 7800 they won't be talking to a single radio but a group of radios where any member of the group can hear the conversation and join in if needed just like an old style repeater.
		This trunked system is also connected to the public telephone system and some of its radios can be called or make calls on it just like mobile phones.
	www.ukmidlandscanner.co.uk /mpt1327track.htm (907 words)

	Public Access Trunked Radio
		However, there are many other trunked radio systems operating in the world, and this month we'll take a look at one of them.
		None of the existing systems they examined were acceptable, mainly because the UK wanted a non-proprietary standard that could be used by anyone without restriction.
		A refinement of this system specified that the remote transceivers had to start their transmissions only at certain intervals, all synchronized to each other by a timing signal sent from the central computer.
	www.signalharbor.com /ttt/01mar (1790 words)

	Learn more about Terrestial Trunked Radio in the online encyclopedia. (Site not responding. Last check: 2007-11-05)
		Learn more about Terrestial Trunked Radio in the online encyclopedia.
		TErrestial Trunked RAdio (TETRA) is a specialist cell phone and walkie talkie standard used by police, ambulance and military.
		TETRA uses Time Division Multiple Access (TDMA) with four user channels on one radio carrier and 25 kHz spacing between carriers.
	www.onlineencyclopedia.org /t/te/terrestial_trunked_radio.html (362 words)

	UHF Trunked Radio Systems (Site not responding. Last check: 2007-11-05)
		SI 2way provides low-cost alternatives to the "push to connect" cellular carriers, and our trunked radio systems offer superior coverage to many of the "local area" systems of our competitors.
		Many options are available such as unit ID, private call, and the ability to disable a stolen or missing radio from receiving or transmitting.
		Or, if your radio service provider isn't giving you the quality of service and personal attention you expect, give us a try.
	www.si2way.com /serv01.htm (172 words)

	Centre County Trunked Radio Systems (Site not responding. Last check: 2007-11-05)
		These trunked systems use an Analog Motorola Type II Smartnet radio system.
		In these cases, the transmitting radio is operating in a different mode.
		C3 System: After my tour of Centre County Emergency Communications Center, I have the final word on the Conventional channels -- Conventional 1 is crosspatched to Fire Dispatch full time.
	www.davehershey.com /scannerstuff.htm (274 words)

	The Radio Reference Homepage
		RadioReference.com is the world's largest radio communications reference website, with complete conventional frequency assignments, trunked radio system information, frequencies, and talkgroups, FCC License assignments and maps, 10-Code Lists, agency maps, files, downloads, links, and detailed agency information for most public safety, military, and local government activities.
		The Radio Reference Forums provide the largest most popular place to come and talk about radio communications monitoring.
		The radio system that is currently operational in the greater New Orleans area was designed to support 800 users; there are currently 2500 users.
	www.radioreference.com (1086 words)

	The Dallas / Ft. Worth Area Trunked Radio Information Page (Site not responding. Last check: 2007-11-05)
		This page details each Trunked Radio System in use in the DFW Area, including Public Safety, Local Government and business SMRs.
		Here you can find that elusive system ID and talkgroup that you have been hunting for.
		The "Trunker and Etrunk" programs are FREE dos based utilities that read the information from a Motorola or Ericsson trunking control channel.
	www.lcblanton.com /dfw/dfwtrunk.htm (174 words)

	TrunkTracker Links
		These are links to pages around the net that deal with Trunked radio systems.
		Area Trunked Systems - TT codes for New Jersey, Pennsylvania, Deleware
		St Louis City Trunk System St. Louis TT codes
	www.geocities.com /CapeCanaveral/Hangar/1251/trunked.html (232 words)

	LACMTA (Site not responding. Last check: 2007-11-05)
		The Los Angeles County Metropolitan Transportation Authority has recently been busy adding to their system.
		Eight new licenses this year stretches their system from Palmdale to Corona.
		Looks like it's a Type II simulcast system.
	members.101freeway.com /gmitch/lacmta.htm (166 words)

	Trunked Radio Systems (Site not responding. Last check: 2007-11-05)
		MonsterMarketplace shopping directory has radio frequency and everything else you re looking for at one secure online location.
		Do you need better listings for radio frequency?
		Click here to get more listings for radio frequency.
	www.theblackcommentator.com /trunked-radio-systems.html (143 words)

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