COMPANY'S PROFILE


During the years of its development Concern ALEX passed the way from ordinary supplier to one of the largest systems integrator, which united both Ukrainian and foreign companies. Concern Alex was one of the first companies that announced themselves at the Ukrainian market of telecommunications and became one of its recognized leaders. Such positions were provided by large experience in choosing, designing and implementation of telecommunications systems, which was gained by analytic, R&D and commercial departments of Concern Alex.

The success of Concern ALEX was generally recognized by decorating Company's Top Management with high national order "Honorary Telecommunications Worker".

IT IS HARD TO BE A LEADER, BUT THE HARDEST TO BE A LEADER ALL THE TIME.

THE MAIN DIRECTIONS OF CONCERN ALEX's ACTIVITY ARE THE FOLLOWING:
  • Systems of professional radio communications
  • Development, mounting, integration, launching and servicing of professional radio systems of any level, supply of base and subscriber equipment.
  • Cellular communications
  • Supply of cellular phones of any standards and complete set of cellular accessories.
  • Security systems
  • Surveillance systems, security systems and systems of access control.
  • Complex office solutions
  • Competent recommendations and supplies of optimal selection of world best equipment for best organization of work in customer's office
  • Manufacturing
  • Development, manufacturing and implementation of high technological equipment
  • Informative analysis and arrangement of international sales contracts and supplies ALWAYS HIGH RELIABILITY WHILE A PERFECT QUALITY

    SYSTEMS OF PROFESSIONAL RADIO COMMUNICATION

    Now powerful potential of Concern ALEX allows solving of any problems in building and servicing of different systems of professional radio communication such as multisite trunking, pseudotrunking and conventional systems, systems of telemetric data transmitting and many other most difficult telecommunication systems. Being an operator of own radio communication networks and integrator of many state services communication systems, Concern ALEX gained rich experience of implementation and mounting of different radio equipment. Today telecommunication systems and equipment integrated by Concern ALEX are successfully used by many largest corporative structures of Ukraine – that are thousands of users.
    Concern ALEX supplies whole spectrum of professional telecommunication equipment, starting from transceivers and repeaters and finishing by turnkey modern telecommunications system, and starting from connectors and cables up to complicated antenna-feeder equipment that suit highest requirements of customers to assortment, price and quality.

    Direct and long termed contacts with leading suppliers of communication equipment let Concern ALEX to supply whole spectrum of latest telecommunication equipment within the shortest period.

    It is enough to say that Concern ALEX is an authorized dealer in Ukraine of such companies as KENWOOD, ICOM, FYLDE MICROSYSTEMS, TELEWAVE, TAIT, TRILOGY and J.P.S. master distributor of SmarTrunk, dealer of others famous companies. Concern ALEX has license ВД № 000275 of State Committee on Telecommunications of Ukraine for building and technical service of telecommunication systems and also their using and providing of mobile connection services.

    CELLULAR COMMUNICATIONS

    Supplies of subscriber equipment (terminals (phones) and accessories to them) for systems of cellular connection of all standards, including NMT-450, GSM, DAMPS, CDMA, etc. Concern ALEX supplies cellular phones of MOTOROLA, which have an excellent market reputation, reliable and comfortable in using. At the same time Concern Alex provides reliable service for them.
    Concern Alex is also the largest supplier of cellular phones accessories at the Ukrainian market and manufactures them at the leading plants worldwide and sells them under its corporative brand name. The optimal price/quality ratio is achieved due to the existence of direct connections with the manufacturers, careful choosing of the supplying models, analysis of design and constructive peculiarities.

    SECURITY SYSTEMS

    A separate direction of Concern Alex activity is providing customers with technical means of information control for the purposes of business management, corporative and personal security. Equipment for audio and video surveillance, systems of audio and video information registration. AVL Systems. All kinds of security systems. Special technical equipment is supplied to the subjects of operational and investigation activity. Licenses № КИХ-00680094 & №020 of State Security Service of Ukraine.

    Development of information protection systems and access control systems of any configuration depending on specific requirements of the customer, systems with exploitation of biometric methods based on identification of unique peculiarities of each person, such as voice peculiarities, signing dynamics, finger and palm prints, hand geometry, retina and iris design, face geometry including.

    COMPLEX SOLUTIONS IN THE FIELD OF TELECOMMUNICATIONS

    COMPLEX OFFICE SOLUTIONS

    Working with a huge corporative customers for a long time, Concern ALEX gain a significant experience in the field of complex solutions of its customers’ needs, that much widen a sphere of trading interests of our company.

    Our specialists always ready to provide customer with the competent recommendations for optimal selection of equipment of best global manufacturers for optimal organization of work in customer’s office. We always make such selection considering customer’s needs and their demand for quality/price ratio.
    So today Concern Alex is ready to provide customers in the shortest period not only with any modern communication products, but also supply the whole range of equipment that customer needs for normal operation in his office. This equipments starts from the stationary and office furniture and ends by complex office technique, computing systems. We are able to provide our customers with any security system including modern systems of video observation, signaling and access control systems based at biometrical technologies.
    Having license for providing global network access services we are also installing local/global networks and providing of full servicing range of Internet access.

    MANUFACTURING

    Concern Alex is actively designing and manufacturing considerable range of the products. Engineers and programmers of best qualification design a high technological equipment, which is manufactured both abroad by OEM projects and in Ukraine on base of accessories from Eastern Asia, Japan, USA etc.
    Among the latest products designed and manufactured by “Concern Alex” are the following:
  • Mobile repeater, that can be developed under the field conditions, portable repeater with 25 Wt power supply ant weight up to 2,5 kg.
  • Equipment that allows providing gates for GSM systems, telephone lines, and systems of radio connection that aimed to transmit data and voice, and work with AVL systems.
  • Supplying and system integration of surveillance systems, security systems, access control systems based at biometrical technologies, AVL systems;
  • Designing of GPS logger for recording of vehicle routing and location and for fixing of control-and-measuring information;
  • Цифровой voice logger – “Partner-911” that was designed by specialist of “Concern Alex” and manufactured together with our USA partner - “Alex Communication Corp.” (USA), Uniqueness of our products is provided by the fact that while its designing our specialists considered all demands of customers and as result we have products that included maximum of needed features and refusal from functions that cost much, but seldom used, allowed significantly decreasing price, without losing quality.

    SUCCESSFUL WORK NEEDS SUCCESSEFUL SOLUTIONS
    Complex approach of Concern ALEX allows fulfilling complete cycle of telecommunication and information systems development:
  • Consulting and support in tasks setting;
  • Development and optimization of technical solutions;
  • System designing;
  • Supplies of necessary equipment;
  • Assembling and putting into operation;
  • System testing;
  • Technical support and systems development;
  • Warranty and post-warranty service.
    INFORMATIVE ANALYSIS AND ARRANGMENT of INTERNATIONAL SALES CONTRACTS AND SUPPLIES

    One of the most important tasks of Concern ALEX is providing customers with wide range of information about the latest achievements in the sphere of High Technologies and arrangement of international sales contracts and supplies.
    Informative and Analytic Department of Concern ALEX steady searches and systemizes a different information about the latest world researches, which is received from hundreds companies – manufacturers and suppliers. Unique experience of Concern ALEX specialists gives an opportunity to find really optimal solutions and equipment based on the technologies that will be known in Ukraine only in future.
    This fact so as stainless reputation of Concern Alex as a reliable business partner attracts companies that are not experienced in international trade. Besides help in products selection our specialists also carry on trade negotiations with the suppliers up to making sales contract under the most profitable for our supplier terms. Having a wide net of forwarding agents all over the world we also help to arrange the soonest and cost effective deliveries.

    JOIN ADVANTAGES OF OUR EXPERIENCE

    SERVICE
    B Concern ALEX has its own Service Center where experienced engineers-experts are involved. Service Center provides whole range of servicing – starting from mounting and launching of new systems and finishing by repairing of sold equipment. Good equipped Service Center allows making complete testing of any products before sales. Due to high professional work of Service Center. Concern ALEX offers its customers cost-effective warranty and post-warranty service, repairing of any level of complexity. All equipment supplied by Concern ALEX is certified by State Стандарт and State Committee on Communications of Ukraine.

    MANAGEMENT

    Huge experience of systems integration and variable activity of Concern ALEX allows offering customers really optimal solutions. Work of experienced sales managers in close cooperation with Analytic Department is featured by individual approach to each customer. After consideration the tasks from customer that need to be solved and customer’s financial abilities, Concern ALEX always offer the best variant of problems’ solution.
    The real advantage of Concern ALEX is following: it offers customer best samples of various suppliers that work in the field of customers interest, that allows customer to choose an optimal variant considering price/quality ratio.
    USA Company Alex Communications, that is a part of Concern ALEX, allows minimize expenses connected with the delivery of goods to Ukraine, which is possible due to consolidation of cargoes, moneys and correct paperwork, and so Concern ALEX is able to offer its customers minimal prices.

    WE TURNED TO THE FUTURE NOT FORGETTING YOUR PRESENT NEEDS.


    CUSTOMERS
    The distinguishing feature of Concern ALEX is long-term relations with customers.
    Such large state institutions as Ministry of Defense, Ministry of Emergencies, Security Service of Ukraine, Ministry of Internal Affairs, Fire Guard Division, State Taxes Administration, Ministry of Ecological Security, Ministry of Transport, Divisions of Ministry of Energy, Borders State Committee and Ukrtelecom and other state organizations are the permanent customers of Concern Alex during many years. Concern ALEX steady provides above customers with updated information, warranty and post-warranty technical service. Concern ALEX steady search for the latest equipment, develops and integrates systems according to the demands of customers.

    DEALERS

    Concern ALEX is represented by a net of authorized dealers all over Ukraine that successfully operate under ALEX supervision. Concern ALEX offers to its regional dealers complete technical and informative support, special prices, respite of payment, helps with registration for frequencies obtaining.
    Perspective plan of Concern ALEX development foresees its further adaptation at the market through the promotion of leading technologies and best equipment of native and foreign manufacturers. Such an approach let Concern ALEX to save its leading positions in the sphere of telecommunications and, as a result, facilitates acceleration of scientific and technical progress in Ukraine. Having perfect technique, significant financial resources and qualified personnel concern looks ahead with confidence.
  • О зарубежных УКВ рациях
    В настоящее время все больше радиолюбителей приобретают УКВ рации ведущих зарубежных фирм. Добротно сработанные, имеющие “ навороты” на все случаи в жизни, все они имеют, на мой взгляд, существенный недостаток – низкую устойчивость к интермодуляционным помехам. Это объясняется тем, что в погоне за максимально возможной чувствительностью, заведомо выше заявленной, все фирмы–производители применяют на входе приемника усилитель высокой частоты с большим усилением. В этом случае не требуется скрупулезная настройка при массовом производстве.
    Входные полосовые фильтры, которые следуют, как правило, за УВЧ, не спасают положения, так как из-за стремления уменьшить их размеры, их конструктивно выполняют с низкой добротностью. Бороться с помехами предлагается установкой в радиостанции тоновых и кодовых шумоподавителей, что не всегда применимо в радиолюбительской практике. Использование внешних антенных фильтров часто не оправдывает себя из-за их высокой стоимости и громоздкости. При желании слушать служебные частоты, антенные фильтры вообще не применимы.
     
     

    С генератора ГВЧ 1 подавался немодулированный сигнал с частотой 150,000 МГц и фиксированным уровнем 2500 мкв. Величина напряжения ГВЧ 1 является типичной для сигналов пейджерных передатчиков, имеющих мощность 0,2-1,5 кВт., которые взаимодействуя с сигналами служебных раций образуют комбинационные помехи.
    На генераторе ГВЧ 2 была установлена частота 155,000 МГц, а уровень сигнала регулировался таким образом, чтобы появился сигнал комбинационной помехи на частоте 145,000 МГц.
    Результаты испытаний сведены в таблицу:
    Модель радиостанции
    Уровень сигнала вызывающий помеху Мкв.
    Alinko DR-130T
    316
    Alinko DJ-182T
    10
    Alinko DR-599T
    316
    Motorola GP-300
    2500
    Motorola GМ-300
    2500
    Motorola GP-68
    316
    YEASU FT-2500
    3160
    YEASU FT-50R
    1,5
    Vertex Стандарт C-108
    1,5
    Из таблицы видно, что наименьшей помехоустойчивостью обладают миниатюрные рации, добротность контуров у которых, стремится к нулю. Кстати эти радиостанции имеют и наивысшую чувствительность - значительно лучше, чем указанные в документации 0,12 Мкв.
    Однако эта повышенная чувствительность никак не может быть использована при работе в эфире на наружную антенну - избыточное усиление перегружает преобразователь приемника, вызывая появление множества интермодуляционных помех. Полезный сигнал попросту “тонет” в сигналах десятков других радиостанций слышимых с уровнем ничуть не меньшим. Однако, если подключить внешнюю антенну через конденсатор ёмкостью 1,5–3 пФ., приём становится вполне удовлетворительным. Аналогичный эффект происходит и при подключении внешней антенны через резистор 0,5-1,5 кОм.
    Джентльмены, это очень легко проверить !!!
    Для борьбы с перегрузкой смесителя , в некоторые модели раций встраивают отключаемый аттенюатор, улучшающий динамический диапазон на величину затухания, но не решающий полностью проблемы.
    Для проверки предположения об избыточном усилении УВЧ, в радиостанции Alinko DR-130T был удален тразистор УВЧ Q1, а на его место поставлен конденсатор 10 пФ cоединивший вход и выход УВЧ. После подстройки контуров была измерена чувствительность, которая упала до 0,8-1,0 Мкв. Уровень сигнала вызывающий интермодуляционную помеху изменился с 316 мкВ до 10 мВ !!!
    При работе рации на коллиниарную антенну в центре Алматы полностью отсутствовали помехи от других раций в течении недели.
    Таким образом предположение об избыточном усилении в УВЧ полностью оправдалось.
    Для проверки возможности снижения усиления можно включить на входе приемника аттенюатор и изменяя его затухание проверять чувствительность, пока она не начнет заметно уменьшаться. Обычно избыточное усиление оценивается величинами 25-30 дБ. Следовательно, примерно на такую же величину можно увеличить и интермодуляционную избирательность приёмника.
    Уменьшить усиление УВЧ можно разными способами:
    В радиостанции Alinko DR-130T был заменен резистор R44 в цепи истока транзистора на другой, величиной 100 Ом и удален шунтирующий конденсатор С125. Вместо резистора R 71 величиной 100 Ом была установлена перемычка. Емкость конденсатора С 124 с 1000 пФ была уменьшена до 15 пФ, а емкость конденсатора С 88 с 22 пФ увеличена до 36 пФ. По этой методике было переделано три радиостанции с неизменно положительным результатом. В радиостанции Alinko DR-599Т усиление было уменьшено путем удаления конденсатора С4 и замыкания второго затвора транзистора Q1 на корпус. В радиостанции YEASU FT-50R был увеличен резистор R 1024 c 220 Ом до 560 Ом и уменьшены переходные емкости С1068 и С1069 до 3 пФ. Все обозначения приведены по приципиальным схемам идущих в комплекте с радиостанциями.
    Указанные доработки позволили почти полностью исключить интермодуляционные помехи от других радиостанций, при полном сохранении чувствительности приведенной в инструкции фирмы-производителя. Никаких регулировок производить не потребовалось.
    После модернизации уровень сигнала вызывающего появление комбинационной помехи указан в таблице:
    Модель рации
    Уровень сигнала вызывающий помеху Мкв.
    Alinko DR-130T
    3160
    Alinko DR-599T
    1000
    YEASU FT-50R
    10
    В рации Alinko DR-599T дальнейшему росту динамики препятствуют коммутирующие диоды АIR- диапазона, ток через которые лежит в пределах 2,2-3 мА. При включении антенны в обход этих диодов возможно увеличение уровня мешающего сигнала ещё на 500 Мкв. В общем случае, необходимо сохраняя ток через транзистор УВЧ не ниже исходного, снижать усиление вводя ООС и уменьшать переходные емкости до величин порядка 1-5 пФ. Следует, однако отметить, что при изменении переходной емкости на входе УВЧ может расстроится фильтр-пробка снижающий уровень ВЧ-напряжения при передаче, что может привести к выходу транзистора УВЧ из строя. Для исключения этого требуется коррекция емкости входящей в контур фильтра-пробки, в сторону увеличения. Это замечание относится только для автомобильных радиостанций с мощность более 10 Вт.