Dual band refers to the capability of GSM network infrastructure and handsets to operate across two frequency bands e.g. 850/1900 MHz A Tri Band phone will operate on three different frequencies depending on the available network. e.g. 850/1800/1900 MHz. A quad-band mobile phone is operational on any of the four GSM frequencies - e.g. 850/900/1800/1900 MHz. This is indeed the ultimate global phone.

Dual band phones tend to work in the UK and Europe and most of the world (GSM 1800 and GSM 900), whilst in America you need a phone that can take GSM 1900 so most often a Tri band or Quad band phone is the best option.

The Vodafone Datacard is a quad-band card GSM 850/900/1800/1900. The Vodafone USB Modem is Tri-band GSM 900/1800/1900.

Tri band refers to the physical frequencies which your mobile phone can operate on. The three international frequencies ranges or bands reserved for GSM are 900MHz, 1800MHz and 1900MHz. A Tri Band phone is what you will need to use in the US. They use GSM 1900 there, just to be different (for a change).

A tri-band phone operates at three supported frequencies, such as 900/1800/1900 MHz or 850/1800/1900 MHz. A dual-band phone operates at two frequencies, such as 850/1900 MHz or 900/1800 MHz.

These terms define the working frequencies of GSM cellular phones on particular networks. There are 3 working frequencies - 900/1800/1900. GSM phones that work on 2 frequencies are called dual band while those that work on 3 frequencies are called tri-band. This facility allows the user to use his/her cell on different networks, and beneficial for international roaming.

Dual band refers to the radio frequencies which your mobile phone can operate on. The three international frequencies ranges or bands reserved for GSM are 900MHz, 1800MHz and 1900MHz. In the Uk, Orange, One to One, Virgin and Telecom Plus use GSM 1800: Cellnet and Vodafone use GSM 900.

It is peripheral specific. For example thru a USB peripheral it is Quad-band and thru Compact Flash it is Tri-band.

The USB Modem is tri-band which means it supports the 900/1800/1900 MHz GSM network frequencies. Quad-band devices also support the 850 MHz network frequency. This means that in a small number of countries - mainly in the Caribbean - the device may not work.

Dual-band/dual-mode phones are also known as tri-mode phones. They can operate in digital mode on 800 MHz and 1900 MHz. The phones can also operate in analog mode on 800 MHz. What this means is that the phones can operate on the three major wireless systems deployed in the U.S., thereby allowing your phone to work almost anywhere wireless coverage exists in the United States.

Tri band refers to the physical frequencies which your mobile phone can operate on. The three international frequencies ranges or bands reserved for GSM are 900MHz, 1800MHz and 1900MHz. In Australia, as at the time of publication, most GSM networks still use only the 900MHz frequency band. Soon, GSM carriers will be upgrading their networks to support the 1800MHz band also.

Most phones these days are sold as dual-band or tri-band phones. If you've bought your phone from the UK the chances are that your phone will work anywhere in Europe, Africa or Asia (a dual-band phone). AND maybe even the US and Canada (tri-band phone). If you are experiencing difficulties ordering online please contact us via email or telephone customer support on 0870 600 1362. Our lines are open 24/7 and someone will get back with you during regular working hours to take your order.

Dual band refers to the radio frequencies which your mobile phone can operate on. The three international frequencies ranges or bands reserved for GSM are 900MHz, 1800MHz and 1900MHz. In Australia, most GSM networks use the 900MHz frequency band although some networks are now using the 1800MHz frequency band also.

You can get a dual band antenna that will cover all 3 modes (analog, digital cellular and digital pcs) or, as mentioned above, focus on where you're having reception problems. First find out what network your phone is actually using in your city by calling your service provider. Just ask if you're in a 800MHz range area or 1900MHz range area.

GSM Mobile Technology operates in Antigua on one frequency level - 900 MHz. Dual band means that your phone will work on 900 MHz and 1800 MHz frequency levels. Tri-band means that your phone will work on 900 MHz, 1800 MHz and 1900 MHz frequency levels, for example if you're traveling to the USA and plan to use your phone, you would need a tri-band phone as they operate on 1900 MHz levels.

GSM Mobile Technology operates on three frequency levels - 900 MHz, 1800 MHz and 1900MHz. Dual band means that your phone will work on 900 MHz and 1800 MHzfrequency levels. Tri-band means that your phone will work on all three levels, for example if you're traveling to the USA and plan to use your phone, you would need a tri-band phone as they operate on 1900 MHz levels. All of our phones are dual band so you can still enjoy a great variety of top class phones for every budget.

Feeding any multi-band array often is a challenge. The frequency range varies from 14 MHz to 28 MHz and the source impedance for each band may vary 2:1 in value. A quad is an array of three or more separate antennas, each with an independent feed point and elements occupying electrically different locations in the array. Methods of feeding in the past have been to co-locate all the feed points and using a single coax feed. With an antenna tuner in the line this method can give good results.

These terms refer to the occupancy of the rooms. Double = 2 adults per room, triple = 3 and quad = 4 adults per room. (adults = 17 years or older) All our rates are based minimum 2 adult occupancy. When there is only 1 adult in the room, the first child will be considered an adult for pricing purposes. Top

Before PCS, all cell phones were single band devices that operated only in the Cellar 800 band. When service providers started to deploy both Cellular band and PCS band service, the cellular phone manufacturers started to make dual-band phones. These phones constantly report the signals and channels that are receiving to the towers, even when there is no call engaged.

Dual band refers to cellular telephones that are able to operate on two different frequency bands, such as GSM 900 and GSM 1900. If a phone has dual band capability, it automatically scans for the strongest signal and switches Networks â€" even during a call within the same operator's Network.

Co-extruded is when TWO colors of HDPE form a two-color produce. Tri-Extruded is when THREE colors of HPDE form a three color product.

In the Nephros Dual Stage Ultrafilter there are two redundant filtration steps, or stages. Each stage is identical. Each stage removes virtually all biological contaminants. If a failure should occur in one stage, the other stage acts as a “backup” and ensures filter safety and integrity. An added advantage of dual stages is that the user can visually verify that the filter is performing correctly.

Some titles are presented on DVD Video in a "Dual Ratio" format - that means you are given a choice of viewing the film in either the "panned and scanned" or "Widescreen" format. This can be done by either using a double-sided disc (one version of the film on each side) or a dual-layer disc (where you would use the interactive menu to select your viewing preference). Storage capacity and timing factors are usually the main determinate of using the "dual ratio" format.

Dual-Fuel can be defined as the simultaneous combustion of two fuels. In the case of the Dual-Fuel System, natural gas is utilized in conjunction with diesel fuel to operate the engine. After conversion, the engine is able to operate on either 100% diesel fuel, or alternately, on a mixture of diesel fuel and natural gas. At no time is the engine able to operate on natural gas exclusively.

Vivotek 6000 series are all Dual Codec systems - meaning that it encodes the image in both MPEG-4 (short header) AND JPEG to provide two different formats for maximum flexibility in the recording and viewing end, depending on whether clarity or speed is desired.

A dual rated heater can be wired to either of the 2 voltage ratings listed on the product identification label. However, the wattage output will decrease with the lower voltage. For example: A 240/208 dual rated heater can be wired to either a 240 volt or a 208 volt supply. A 1500 watt fan heater will draw 1500 watts wired to 240 volt and 1125 watts (75% of 240 volt rating) wired to 208 volt.

It is called a Dual Agency when an agent, brokerage or company is representing both the buyer and seller. Although legal, dual agency nevertheless comes with an inherent conflict of interest as the agent attempts to fairly represent two opposing clients and collect the full commission. Buyers: Consider working with a buyer's agent who represents you exclusively (not both you and the seller) and is more likely to work with your best interests at heart.

Quad band literally means four (4) bands. Most people come across the term when it is used to describe a GSM mobile phone. The GSM standard originated in Europe, where mobile phones occupy two frequency bands: one in the 900-MHz range and one in the 1800-MHz range. When GSM technology crossed the Atlantic to the Americas, it was impossible to reuse the same European frequency bands since those had already been allocated to other devices by the FCC.

A Quad-band GSM phone operates on the four internationally designated GSM frequencies- 850, 900, 1800 and 1900 MHz. The capability to seamlessly handover between the four bands offers operators major capacity gains. The 850 frequency is used in North America, Latin America and parts of the Caribbean.