Вопрос № 605437 - Английский язык

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Our 18.6 ounce Car-Less Phone operates at the maximum 0.6 Watt power allowed for a hand-held portable. It’s programmed with a cellular number, ready to use the moment you open the box.
It comes with 2 rechargeable batteries that provide nearly 4.5 hours of talk time or 60 hours of standby. The Car-Less Phone has every feature you’ll ever need, from 110 memories, to a user friendly alphanumeric menu for simplified use. The PLUS button puts you in contact with one of our representatives for nationwide roaming or service assistance, airtime free.
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Our 18.6 ounce Car-Less Phone operates at the maximum 0.6 Watt power allowed __________________.

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Cell-phone channels
1. A single cell in an analog cell-phone system uses one-seventh of the available duplex voice channels. That is, each cell (of the seven on a hexagonal grid) is using one-seventh of the available channels so it has a unique set of frequencies and there are no collisions. A cell-phone carrier typically gets 832 radio frequencies to use in a city. Each cell phone uses two frequencies per call – a duplex channel – so there are typically 395 voice channels per carrier.
2. Therefore, each cell has about 56 voice channels available. In other words, in any cell, 56 people can be talking on their cell phone at one time. Analog cellular systems are considered first-generation mobile technology, or 1G. With digital transmission methods (2G), the number of available channels increases. For example, a TDMA-based digital system (more on TDMA later) can carry three times as many calls as an analog system, so each cell has about 168 channels available.
3. Cell phones have low-power transmitters in them. Many cell phones have two signal strengths: 0.6 watts and 3 watts (for comparison, most CB radios transmit at 4 watts). The base station is also transmitting at low power. Low-power transmitters have two advantages. The transmissions of a base station and the phones within its cell do not make it very far outside that cell. The power consumption of the cell phone, which is normally battery-operated, is relatively low. Low power means small batteries, and this is what has made handheld cellular phones possible.
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Lower power transmitters …

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Capable of continuous at room temperatures, a blue-green semiconductor laser uses a 523 nm oscillation wavelength and offers a 4.5 mA threshold current. In developing the device, the engineers used zinc-magnesium-selenide for the photo layer, and zinc-magnesium-sulfide-selenide for the cladding layer. This encloses the electrons, the positive hole and the light. For this purpose, the engineers improved the proprietary manufacturing technique for the cladding layer, a process offering fine quality. A resonator surface protection film enhances the energy efficiency, enabling a suitable threshold current and a threshold current density of 1.4 kA/cm2.
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The engineers improved the proprietary manufacturing technique ________.

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The ML9927 semiconductor laser works in the 1.55 µm band, produces a single wavelength and transmits to points 100 km away. The laser will work in advanced optical communication networks that transmit data at 2.5 Gbps. In constructing the device, the engineers applied a multiple layer quantum well (MQW) structure to the active layer of the lightemitting section, using an optimum number of quantum wells. By limiting the wavelength modulation to 0.3 nm during signal modulation at 2.5 Gbps the ML9927 achieves long-distance transmission up to 100 km. Previously, the longest possible distance was 30 km at a 1nm wavelength modulation. Tests of the product show a service life at 50˚C of 100,000 hours (about 12 years).
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The laser will work in advanced optical communication networks that transmit _________.

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Omeg Ltd is launching two 360˚ servo potentiometers with life spans greater than 10 million cycles – a ten-fold increase on the company’s standard design carbon track rotary potentiometers. Long life results from a new flush bonding technique for producing the resistance tracks. This process uses a polymer based conductive plastic ink which is bonded at high temperature and pressure to an epoxy substrate to produce tracks that are hard wearing and have a mirror-like finish. The potentiometers are specifically designed for industrial control applications such as servo positioning, where high speed reversals of direction or vibration are encountered.
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Long life results from a new flush bonding technique for producing ________.

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An auto-tune beacon receiver that automatically finds the strongest beacon station transmitting DGPS error corrections and locks onto it in seconds. The receiver works automatically with all Army Corps of Engineers DGPS beacon broadcasts transmitting in the Type 9 message format, as well as all international beacon systems.
A combined GPS/beacon also available as an option, eliminating the need for separate antennas, cables and external grounding. This H-field ferrite loop antenna provides improved signal reception under poor atmospheric conditions. The unit is waterproof and can be installed in an open cockpit or fly bridge. It has a large easy-to-read screen with simple menu-driven operation. The screen has been upgraded with a transflective LCD.
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H-field ferrite loop antenna provides improved signal reception under ________.