The document discusses various digital television standards used around the world like DVB-T, ATSC, ISDB-T, and DTMB. It provides information on bandwidth and number of channels supported by different standards. The document also talks about frequency assignments and allotments for UHF band in various Middle Eastern countries. Migration from analog to digital terrestrial television involves transitioning to a DVB-T2 standard using MPEG-4 and SFN technology in the UHF band in Palestine.
This document outlines the topics to be covered in a DVB-T training course from October 11-13, 2015, including analog vs digital TV, COFDM, planning DVB-T networks, GE-06 and plan modification, a case study using planning software, DVB-T2, and DVB-T topology.
The document summarizes the design of a radio frequency transmission system for C.N. Tower in Toronto, Canada. The system combines a 2.5kW digital UHF transmitter on channel 66 with a 10kW analog UHF transmitter on channel 52, using the same antenna. Key aspects of the design include using a digital mask filter as a channel combiner, optimizing the transmission line for low VSWR, providing over 60dB of insulation between transmission paths, and allowing future expansion. The system was designed to integrate into the tower's existing equipment layout while meeting power, cooling and regulatory requirements.
The document discusses the UK's policy for digital terrestrial television (DTT) and the licensing of DTT multiplexes when the platform launched in 1998. Key points include:
- 6 DTT multiplexes were licensed, with different obligations for public service broadcasting (PSB) and pay-TV services across the multiplexes.
- Spectrum for the multiplexes was awarded through a "beauty contest" process rather than an auction at the time.
- The multiplex licenses came with requirements around coverage, technology standards, and mandated capacity for PSB channels.
- Over time the DTT platform has evolved as it moved to higher power transmissions after analogue switch-off and adopted
The document discusses LARCAN's DVB-T/H solution. It provides an overview of DVB-H as an extension of DVB-T to enable digital video broadcast services on mobile devices. It also describes how to set up DVB-T/H networks, including planning, transmitters, distribution networks, and synchronization for single frequency networks. Testing and optimization procedures are outlined as well as network monitoring and quality control. LARCAN is positioned as a leader in digital transmitter solutions that can provide a complete DVB-H portfolio.
Overview of DVB-T standard to deploy Digital Terrestrial TelevisionFarhad Shahrivar
DVB-T is a technical standard for digital terrestrial television broadcasting that specifies framing, channel coding, and modulation. It is used in over 40 countries with nearly 200 million receivers sold, mostly in Europe. Benefits of DVB-T include better quality TV, improved population coverage, spectrum efficiency allowing more channels, and enabling HDTV and reception on mobile devices. Key issues in deploying DVB-T networks include establishing appropriate legal and regulatory frameworks, network planning, and content distribution infrastructure.
Alan Warren was an Australian artist born in 1919 in Victoria. He studied drawing and painting at the National Gallery of Victoria Art School during 1937-38. During World War 2, he served in the camouflage corps disguising perimeter defenses in Darwin. After the war, he was director of Myer Gallery from 1946-47 and focused on graphic design and painting, particularly still lifes and landscapes. His work was included in several major Australian art surveys and exhibitions. Later in his career, he taught art and managed art galleries while continuing to paint consistently in a semi-abstract style that emphasized geographical contours and pictorial structure with reduced and unmodulated color.
This document provides information and recipes for making fruit and vegetable juices and smoothies. It discusses the health benefits of juices, such as providing vitamins and minerals in an easily absorbed form. It also notes that juices contain more nutrients than whole fruits and vegetables due to breaking down the fiber. The document then provides recipes for various fruit and vegetable juice combinations, as well as steps for making smoothies and shake recipes using a blender. The overall document focuses on healthy juice and smoothie recipes and their nutritional benefits.
This document provides a test report for the Jiuzhou DTS HDTV PVR Satellite Receiver model 0066. The receiver supports digital satellite television reception and recording. It has HDMI and RCA outputs, a USB port, and supports picture resolutions up to 1080i and 720p. The remote control is ergonomically designed for comfort. The report concludes the combination of high-definition television and recording functions represents a step toward the future, and with the 0066 model Jiuzhou aims to be an excellent player in the future.
This document discusses strategies for LGBT social media and web 2.0 marketing. It focuses on leveraging interpersonal relationships through social networks like Facebook, Twitter, LinkedIn and others. It provides tips on creating and sharing content across multiple platforms, identifying influencers, and measuring the results of social media marketing efforts. The goal is to engage audiences and spread messages through social interactions and relationships.
Monika Sharma is seeking a position that allows her to utilize her skills and experience to contribute to an organization's betterment and progress. She has a Certificate in Computer Concepts, B.Ed degree focusing on Commerce and Math, and one year diploma in computer application programming. She also has M.Com and B.Com degrees. Her work experience includes over 5 years in administrative roles at educational institutions, teaching computer skills. She is proficient in Microsoft Windows, Office, and programming languages like C and C++.
Presentatie van Hans Korbee van Agentschap NL tijdens
Netwerkbijeenkomst 23 mei 2012
Platform binnenluchtkwaliteit basisscholen in Gelderland
Provinciehuis, Noordgalerij, Arnhem 9:00-14:00 uur
The document discusses a new product launch for a company. It outlines key details of the product, including its features and target customers. It also provides a timeline for rolling out marketing and launching the product nationally over the next year.
The document discusses various digital television standards used around the world like DVB-T, ATSC, ISDB-T, and DTMB. It provides information on bandwidth and number of channels supported by different standards. The document also talks about frequency assignments and allotments for UHF band in various Middle Eastern countries. Migration from analog to digital terrestrial television involves transitioning to a DVB-T2 standard using MPEG-4 and SFN technology in the UHF band in Palestine.
This document outlines the topics to be covered in a DVB-T training course from October 11-13, 2015, including analog vs digital TV, COFDM, planning DVB-T networks, GE-06 and plan modification, a case study using planning software, DVB-T2, and DVB-T topology.
The document summarizes the design of a radio frequency transmission system for C.N. Tower in Toronto, Canada. The system combines a 2.5kW digital UHF transmitter on channel 66 with a 10kW analog UHF transmitter on channel 52, using the same antenna. Key aspects of the design include using a digital mask filter as a channel combiner, optimizing the transmission line for low VSWR, providing over 60dB of insulation between transmission paths, and allowing future expansion. The system was designed to integrate into the tower's existing equipment layout while meeting power, cooling and regulatory requirements.
The document discusses the UK's policy for digital terrestrial television (DTT) and the licensing of DTT multiplexes when the platform launched in 1998. Key points include:
- 6 DTT multiplexes were licensed, with different obligations for public service broadcasting (PSB) and pay-TV services across the multiplexes.
- Spectrum for the multiplexes was awarded through a "beauty contest" process rather than an auction at the time.
- The multiplex licenses came with requirements around coverage, technology standards, and mandated capacity for PSB channels.
- Over time the DTT platform has evolved as it moved to higher power transmissions after analogue switch-off and adopted
The document discusses LARCAN's DVB-T/H solution. It provides an overview of DVB-H as an extension of DVB-T to enable digital video broadcast services on mobile devices. It also describes how to set up DVB-T/H networks, including planning, transmitters, distribution networks, and synchronization for single frequency networks. Testing and optimization procedures are outlined as well as network monitoring and quality control. LARCAN is positioned as a leader in digital transmitter solutions that can provide a complete DVB-H portfolio.
Overview of DVB-T standard to deploy Digital Terrestrial TelevisionFarhad Shahrivar
DVB-T is a technical standard for digital terrestrial television broadcasting that specifies framing, channel coding, and modulation. It is used in over 40 countries with nearly 200 million receivers sold, mostly in Europe. Benefits of DVB-T include better quality TV, improved population coverage, spectrum efficiency allowing more channels, and enabling HDTV and reception on mobile devices. Key issues in deploying DVB-T networks include establishing appropriate legal and regulatory frameworks, network planning, and content distribution infrastructure.
Alan Warren was an Australian artist born in 1919 in Victoria. He studied drawing and painting at the National Gallery of Victoria Art School during 1937-38. During World War 2, he served in the camouflage corps disguising perimeter defenses in Darwin. After the war, he was director of Myer Gallery from 1946-47 and focused on graphic design and painting, particularly still lifes and landscapes. His work was included in several major Australian art surveys and exhibitions. Later in his career, he taught art and managed art galleries while continuing to paint consistently in a semi-abstract style that emphasized geographical contours and pictorial structure with reduced and unmodulated color.
This document provides information and recipes for making fruit and vegetable juices and smoothies. It discusses the health benefits of juices, such as providing vitamins and minerals in an easily absorbed form. It also notes that juices contain more nutrients than whole fruits and vegetables due to breaking down the fiber. The document then provides recipes for various fruit and vegetable juice combinations, as well as steps for making smoothies and shake recipes using a blender. The overall document focuses on healthy juice and smoothie recipes and their nutritional benefits.
This document provides a test report for the Jiuzhou DTS HDTV PVR Satellite Receiver model 0066. The receiver supports digital satellite television reception and recording. It has HDMI and RCA outputs, a USB port, and supports picture resolutions up to 1080i and 720p. The remote control is ergonomically designed for comfort. The report concludes the combination of high-definition television and recording functions represents a step toward the future, and with the 0066 model Jiuzhou aims to be an excellent player in the future.
This document discusses strategies for LGBT social media and web 2.0 marketing. It focuses on leveraging interpersonal relationships through social networks like Facebook, Twitter, LinkedIn and others. It provides tips on creating and sharing content across multiple platforms, identifying influencers, and measuring the results of social media marketing efforts. The goal is to engage audiences and spread messages through social interactions and relationships.
Monika Sharma is seeking a position that allows her to utilize her skills and experience to contribute to an organization's betterment and progress. She has a Certificate in Computer Concepts, B.Ed degree focusing on Commerce and Math, and one year diploma in computer application programming. She also has M.Com and B.Com degrees. Her work experience includes over 5 years in administrative roles at educational institutions, teaching computer skills. She is proficient in Microsoft Windows, Office, and programming languages like C and C++.
Presentatie van Hans Korbee van Agentschap NL tijdens
Netwerkbijeenkomst 23 mei 2012
Platform binnenluchtkwaliteit basisscholen in Gelderland
Provinciehuis, Noordgalerij, Arnhem 9:00-14:00 uur
The document discusses a new product launch for a company. It outlines key details of the product, including its features and target customers. It also provides a timeline for rolling out marketing and launching the product nationally over the next year.
This document appears to be a magazine or journal focused on digital television technology. It contains several articles and reports on various digital TV products and companies, including reports on IPTV receivers, satellite receivers, signal analyzers, and network equipment. It also includes company profiles, news briefs, and listings of upcoming industry events and trade shows. The publication seems aimed at industry professionals working in digital television globally.
The document discusses high-frequency filters produced by MFC. It provides details on the types of filters MFC produces, their uses, and benefits. Key points:
- MFC specializes in filters between 5 Hz and 50 GHz for applications like satellite reception systems, cable headends, and satellite uplinks.
- Their filters are particularly useful for eliminating interference in crowded frequency bands like the C-band. Filters allow specific frequency ranges to pass while blocking others.
- The document outlines different filter types (low-pass, high-pass, band-pass, band-reject) and how they work to filter out unwanted signals above or below cutoff frequencies.
The document provides an overview and review of the Icecrypt S3700CHD triple tuner PVR receiver. It has an elegant front panel with a VFD display and card readers. The back panel features three tuner inputs, USB, HDMI, and network ports. The remote is well-designed and the manual is available in multiple languages. The initial setup guide assists with configuration. It supports 1080p video output and all DiSEqC protocols. Channel searches found over 1500 TV and 300 radio channels on HOTBIRD. The software provides a user-friendly interface for navigation, settings, and multimedia features. Overall, the receiver offers excellent hardware and sophisticated yet easy-to-use software.
GlobalInvacom is a UK-based fiber optic manufacturer that developed FiberIRS, a technology for distributing satellite signals via fiber optic cables. Since its introduction 5 years ago, FiberIRS has connected over 2 million households. GlobalInvacom continues improving FiberIRS, allowing it to now support up to 4,096 connections from a single satellite dish. The company has grown significantly, with 1,600 employees working across multiple offices and 14 engineers dedicated to further developing FiberIRS. GlobalInvacom is working on new products to transmit more signal types over fiber optic networks and make installation easier.
1. The document describes how to set up an IPTV system using a Raspberry Pi device as the receiver. A PC is used as the server with TSReader Pro to receive broadcast signals and stream channels over the network.
2. Key steps include downloading the OpenELEC operating system onto an SD card for the Raspberry Pi, adding MPEG2 license keys, and configuring TSReader Pro on the server PC to demux channels and stream them individually over the network to be received by the Raspberry Pi.
3. The Raspberry Pi converts any TV into a networked media center using XBMC. Being small and inexpensive, it can be easily hidden behind a TV and controlled remotely with a wireless keyboard
The document discusses proposed extensions to the DVB-S2 digital video broadcasting standard over satellites. The extensions aim to improve spectrum efficiency and allow for higher data rates. Key points include:
1) Reducing roll-off factors and side lobes of carriers allows transponders to be placed closer together, utilizing bandwidth.
2) Using wider bandwidth transponders that are 3 times the size of typical ones further increases efficiency.
3) A new 64-APSK modulation scheme and additional coding options provide more flexibility to optimize throughput.
4) Overall, the extensions could provide up to 20% higher data rates for broadcasting and 64% for professional services.
ELNET is a digital TV wholesaler and retailer located in Iceland that offers a wide range of digital TV products from small DVB meters to large DVB transmitters. As the Icelandic market is small with only 300,000 people spread across a large geographic area, ELNET aims to provide as wide a product selection as possible. ELNET has been in business since 1982 and is a distributor for Rohde & Schwarz equipment, supplying around half of Iceland's digital TV transmitters. While satellite dishes remain popular sellers, ELNET expects fiber optic distribution systems to grow in popularity in the coming years as their price difference with coaxial systems decreases.
The document tests a Deviser S7000 multi-norm digital TV signal analyzer. In part 1, the analyzer's functions are introduced, including its high resolution display, real-time spectrum analysis, and remote control capabilities. Part 2 details testing done by TELE-audiovision, finding the S7000's measurement precision to be very similar to five reference analyzers. Alignment of a motorized antenna using the S7000's waterfall diagrams is described as extremely easy. Troubleshooting interference in a CATV system is also demonstrated.
- Marcos Benni has set up a new office in Jundiai, Brazil to expand his digital TV forum BSD and start a new online store selling digital TV products.
- The store, bsdshop.com.br, will feature short product videos to better demonstrate products and their uses. It will sell items like satellite dishes, LNBs, cables, and receivers.
- Benni has installed multiple satellite dishes in his office to receive channels for his forum and keep visitors informed. He also demonstrates IPTV and plans to restart an internet radio station.
- BSD forum receives around 400,000 monthly visitors, mainly from Brazil, making it one of the largest digital TV
The Amiko Mini HD is a compact DVB-S2 HDTV receiver measuring only 15 x 11 x 3.5 cm and weighing 250g. It has a full set of features including HDMI output, PVR recording, an integrated EPG and network functions. The receiver supports DiSEqC, has an automatic mode to adapt to the TV resolution, and can scan satellites and transponders. Its compact size allows it to be hidden while still providing full HDTV and recording capabilities.
The AB IPBox Prismcube Ruby is a new HDTV PVR satellite receiver with a media center built around the Xbox Media Center operating system. It has a modern, elegant design and is well-equipped with features like two satellite inputs, HDMI, USB, and network connectivity. The initial installation guide walks the user through setup, including customizing video output settings, setting up diverse antenna configurations via DiSEqC protocols, scanning over 100 pre-programmed satellites, and setting the time signal from user-selected channels. The receiver supports recording functionality and an extensive EPG for navigating live and recorded content.
The Handheld Satcom Test Source by WORK Microwave is a portable test signal generator designed for precise high-frequency measurements. It can generate signals from 50-180 MHz and 950-2150 MHz with adjustable power levels. The generator has two independent synthesizers allowing it to output two signals simultaneously for measuring intermodulation in high-frequency converters. Its portability and integrated rechargeable battery make it a versatile tool for testing satellite transmission equipment.
This issue of TELE-audiovision magazine includes reviews of various digital TV products such as signal analyzers and satellite receivers. It also features articles on emerging technologies like ultra high definition television and self-made IPTV systems. The magazine provides company profiles of digital TV wholesaler ÖREIND in Iceland, satellite receiver manufacturer CHANGHONG in China, and satellite uplink provider SPEEDCAST in Brazil. TELE-audiovision has been the world's largest digital TV trade magazine since 1981.
Speedcast is a large satellite TV uplink operator located in Barueri, Brazil. It began uplinking HDTV signals in 2008, making it the first company to do so in Brazil. Speedcast operates seven large uplink dishes and has over 30 employees. It provides uplink services to several major Brazilian TV channels and also has its own small studio for producing business television programs. Speedcast has established itself as one of the leading satellite TV uplink providers in Brazil over the past 10 years.
Öreind is a two-person electronics repair and installation business located in Iceland that is celebrating its 25th anniversary. It specializes in repairing home electronics devices, installing satellite dishes and antennas, and providing components for satellite, terrestrial, and internet protocol television (IPTV). While satellite installation was a major source of business in the past, the company sees IPTV as key to its future success as digital television delivery evolves. Öreind aims to support all television distribution methods in Iceland from its full warehouse of equipment and expertise in installations.
The document provides a test report of the MKTech IS1-19HD hybrid satellite and terrestrial PVR receiver. It has inputs for both DVB-S2 satellite signals and ISDB-T terrestrial channels, making it well-suited for the South American market. The receiver performed well in tests, with fast channel changing, excellent signal sensitivity, and the ability to scan and record multiple channels simultaneously. It also features a removable hard drive bay, wireless connectivity, online functions, and robust PVR and media playback capabilities. In conclusion, the IS1-19HD is recommended for its thoughtful software and rich yet easy-to-use functions.
The document tests and reviews the Horizon HD-CM+ digital TV signal meter for DVB-C networks. It found the meter to be extremely easy to operate, with a clear LCD display and intuitive menu navigation. The meter measures signal levels, modulation error ratio, and bit error rate on digital channels accurately compared to a reference meter. It also features functions useful for professionals such as leakage testing, spectrum analysis, and storing measurement logs. The review concludes the HD-CM+ is an excellent signal meter for installers thanks to its usability, performance and inclusion of tools needed for professional work.
Ultra high definition television (UHDTV) provides a significant increase in resolution compared to existing high definition television (HDTV) standards. UHDTV, also known as 4K, doubles the resolution of HDTV to 3840 x 2160 pixels, while 8K UHDTV quadruples the resolution to 7680 x 4320 pixels. In addition to higher resolution, UHDTV improves on HDTV by offering a wider color space for more natural colors, increased frame rates up to 120 frames per second for smoother 3D video, and expanded audio with up to 22 channels. However, UHDTV requires much greater bandwidth for transmission and faces challenges related to developing new equipment and transmission standards that
This document discusses IPTV (Internet Protocol Television) networks and protocols. It begins by explaining some key terms like TCP, UDP, RTP, multicasting and unicasting. TCP ensures correct packet delivery but is not ideal for live video. UDP is better suited for live streams as it does not check for packet loss. RTP improves UDP streams with features like timestamps. Multicasting sends one stream to multiple receivers, while unicasting sends to one. A 1000Mbps network is recommended for robust IPTV delivery to avoid overloading switches. Network monitoring tools can analyze IPTV traffic and troubleshoot issues.
1. PRODUCT REVIEW وحدة خفض ضجيج بالياف ضوئية للهوائيات الرئيسية التركيز
وحدة خفض ضجيج ضوئية مع حواف تقوية
االن للهوائيات الكبيرة حقا
توماس هرينج( )Tomas Haring
يتم نقل فولتية التحكم 31 فولت النطاق الترددي المحول بين 059 كان اول ظهور لوحدة خفض الضجيج من شركة انفاكوم
او 81 فولت عبر الكابل المحوري 0512- ميغاهيرتز ، يجب القيام العالمية ( )Invacomفي صيف9002 . و بدون ادنى شك
لوحدة خفض الضجيج و هنا يتم بامرين للتمكن من استقبال كامل فان هذا المنتج لديه القدرة على احداث ثورة في االستقبال
اختيار اي قطبية يتم استقبالها ( الطيف الترددى للقم رالصناعي . الفضائي المباشر . لكن ما هي بالضبط وحدة خفض
31 فولت للقطبية ال رأسية و 81 الضجيج الضوئية ؟ لجميع قرائنا الذين لم يتابعوا تطور
فولت للقطبية االفقية ) . أوال : توجد قطبية االشارة . يمكن هذا المنتج الجديد ، نرغب ان نقدم لكم لمحة مختصرة عنه .
ان تكون خطية ( افقي او عمودي )
ثانيا : يوجد اشارة التحكم 22 او تكون دائرية ( دائري الى اليسار استقبال فضائي و تقوم الوحدة في البداية لننعش ذاك راتنا بكيفية
كيلو هيرتز و التى يتم حملها او دائري الى اليمين ) . هنا سوف بدورها بتحويل هذه االشا رات الى عمل وحدة خفض الضجيج القياسية
عبر الكابل المحوري ، على سبيل نناقش االستقطاب الخطي مع ان نطاق ترددي منخفض حتى يتم نقله ( : )LNBتستقبل وحدة خفض
المثال ، وحدة خفض الضجيج معظم ما ينطبق عليه ينطبق على بواسطة كابل محوري الى موالف الضجيج اشا رات القمر الصناعي
العالمية التى تبدل بين الحزم االستقطاب الدائري . جهاز االستقبال . و يكون هذا التى تم تركيزهاعليها بواسطة طبق
54 TELE-satellite — Global Digital TV Magazine — 04-05/2010 — www.TELE-satellite.com
2. TELE-satellite World .../www.TELE-satellite.com
:Download this report in other languages from the Internet
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هنا يمكن للمستخدم الهائي في الوقت الذى يتم فيه توصيل Spanish Español www.TELE-satellite.com/TELE-satellite-1005/esp/globalinvacomlnb.pdf
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المثال و بسهولة توصيل جهاز مخارج) مباشرة لجهاز االستقبال Italian Italiano www.TELE-satellite.com/TELE-satellite-1005/ita/globalinvacomlnb.pdf
Hungarian Magyar www.TELE-satellite.com/TELE-satellite-1005/mag/globalinvacomlnb.pdf
استقبال(بخاصية مسجل) ثنائي فان النسخة الرباعية ترسل كل Mandarin 中文 www.TELE-satellite.com/TELE-satellite-1005/man/globalinvacomlnb.pdf
Dutch Nederlands www.TELE-satellite.com/TELE-satellite-1005/ned/globalinvacomlnb.pdf
الموالف في غرفة المعيشة ، جهاز من االربعة حزم و قطبيات الى Polish Polski www.TELE-satellite.com/TELE-satellite-1005/pol/globalinvacomlnb.pdf
Portuguese Português www.TELE-satellite.com/TELE-satellite-1005/por/globalinvacomlnb.pdf
استقبال اخر في غرفة االطفال و المخارج االربعة و التى يتم Romanian Românesc www.TELE-satellite.com/TELE-satellite-1005/rom/globalinvacomlnb.pdf
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جهاز اخرفي غرفة النوم . توصيلها مع نظام توزيع المحول Swedish Svenska www.TELE-satellite.com/TELE-satellite-1005/sve/globalinvacomlnb.pdf
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المتعدد . 0102 Available online starting from 2 April
لو تم استخدام نظام توزيع كابل
محوري قباسي ، فان كل شقة بعنى هذا ان كابل الياف ضوئسة
ستحتاج الى ان يتم تزويدها باربعة واحد يمكن استخدامه لحمل مجمل مخارج مستقلة , يقوم كل مخرج الترددية المنخفضة و المرتفعة .
من المحول المتعدد . فكما ترون الطيف الترددي لقمر صناعي. بتزويد جهاز االستقبال المتصل تغطي الحزمة المنخفضة المدى
هناك امكانيات هائلة باستخدام هذه كابل واحد بسمك 3 ملي متر بخرج به بالحزمة و القطبية الالزمة من 7.01 الى 57.11 جيجا هيرتز
التكنولوجيا الجديدة . فانها تسهل من وحدة خفض الضجيج هو كل . اذا كان هناك حاجة الكثر من بينما تغطي الحزمة المرتفعة المدى
و تقلل من تكاليف تركيب انظمة ما تحتاجه – حيث ان هذا الشعاع ثمانية مخارج يتم استخدام محوالت من 8.11 الى 5721 جيجا هيرتز .
االستقبال الفضائي الكبيرة و ايضا الضوئي يحمل مجمل الطيف متعددة . يتم توصيل اربعة كابالت
يوجد امكانيات جديدة للمستخدم الترددي للقم رالصناعي ، فمن مستقلة خارجة من وحدة خفض اذا تلقت وحدة خفض الضجيج
الواحد . الممكن توصيل اي عدد من اجهزة ضجيج الى احد المحوالت المتعددة اشارة 22 كيلو هيرتز من جهاز
االستقبال و يتم تشغيلهم كل على و الذى يقوم بدوره بتوزيع االربعة االستقبال فان وحدة خفض الضجيج
انفاكوم شركة قدمت حده . حزم و القطبيات الى اى عدد من تتحول للنطاق المرتفع و ترسل
( )INVACOMحتى االن نموذج المستخدمين و ذلك حسب الحاجة . النطاق الترددي لجهاز االستقبال .
وحدة خفض ضجيج ضوئية على سبيل المثال ، اذا احتاجت اذا لم تشعر وحدة خفض الضجيج
بتغذية مدمجة لتعويض الهوائيات بناية سكنية بأكملها ان يتم تزويدها لسوء الحظ فان عبارة " اى عدد باشارة التحكم 22 كيلو هيرتز ،
( . )offsetلقد وضعنا هذا النموذج باشا رات االقمار الصناعية ، فان من المستخدمين " ليست دقيقة فيتم ارسال اشارة النطاق الترددي
عبر عدة اختبا رات و كنا سعداء وحدة خفض الضجيج الجديدة او صحيحة تماما . فان استخدام المنخفض لجهاز االستقبال بدال من
جدا بالنتائج . من شركة انفاكوم العالمية كابل محوري و توزيع االشارة المرتفع .
( )INVACOMهى الحل . كل ما عبرعدة محوالت يؤدي الى شئ ال
لكن هذا النموذج ياتي مع قيود : تحتاج القيام به هو توصيل كابل يمكنك تجاهله اال وهو : توهين و هناك شئ واحد واضح و هو انه
يمكن استخدام وحدة خفض الضجيج الياف ضوئية من وحدة خفض اضعاف االشارة – يمكن التغاضي يتم نقل واحد من اربعة احتماالت
هذه مع هوائيات ذات معامل الضجيج لنقطة التوزيع المركزية . عن توهين و اضعاف االشارة اذا كنا عبر الكابل المحوري ( االحتماالت
تعويض و يعني هذا انه يجب ان و يتم بعد ذلك تقسيمها الى كوابل نتعامل مع عدد 8 – 01 توصيالت هى : رأسي او حزمة منخفضة
ال يزيد حجم الطبق عن 8.1 متر الياف ضوئية متعددة و يتم توجيهها و لكن اذا كان هناك حاجة لعدد 02 افقية او رأسي او حزمة مرتفعة
. يرجع الفضل لالقمار الصناعية الى كل طابق من البناية . هناك يتم – 03 او 04 توصيل فتصبح هنا افقية ) . بوجود نظام استقبال
القوية االرسال ، يعتبر حجم هذا تقسيمها مرة اخرى حيث تحصل كل مشكلة حقيقية . فردي بمستخدم واحد لن تكون هذه
الطبق اكثر من كافي لالستقبال شقة في الطابق على كابل االلياف مشكلة على االطالق . لكن اذا كان
الطبيعي للقمر الصناعي و لكن الضوئية الخاص بها . هنا ياتي دور وحدة الضجيج هناك اكثر من مستخدم يريدون
الضوئية . و التى تقوم بتحويل و استقبال اشا رات القم رالصناعي
دمج االربعة انواع المختلفة للحزمة بشكل مستقل في نفس الوقت من
و القطبية و تحولهم لنطاق ترددي طبق واحد هنا تبدأ اول المشكالت
مختلف يت راوح بين 1 و 5 جيجا في الظهور .
هيرتز ، ويتم بعد ذلك تحويل اشارة
( )RFالى اشارة رقمية و بعد ذلك اذا كان احد االشخاص يشاهد
يتم نقها من وحدة خفض الضجيج قناة تلفزيونية ذات حزمة منخفضة
عبر كابل الياف ضوئية باستخدام راسية فان جميع المستخدمين
اليزر المدمج . االخرين مضطرين لمشاهدة قناة
بنفس الحزمة و القطبية و هذا على
بعد ذلك يقوم صندوق المحول فرضية انهم جميعا متصلين عبر
( )GTUالمتصل في الطرف االخر نفس كابل القم رالصناعي . واقعيا
من كابل االلياف الضوئية باعادة فان هذا االعداد بال معنى و لن
تحويل االشارة الرقمية الى اشارة يكون اى من المستخدمين راضيا
يمكن التعرف عليها من قبل جهاز عنه .
استقبال فضائي قياسي . تتوفر
وحدات ( )GTUبنمادج ثنائية ، او تم حل هذه المشكلة باستخدام
رباعية او رباعية كواترو. وحدات خفض ضجيج ذات ثمانية
56 TELE-satellite — Global Digital TV Magazine — 04-05/2010 — www.TELE-satellite.com
3. BADR 26° East spectrum with the Invacom LNB NSS7 22° West spectrum with the Invacom LNB
BADR 26° East spectrum with a coaxial LNB NSS7 22° West spectrum with a coaxial LNB
Hispasat 30° West spectrum with the Invacom LNB ABS1 75° East spectrum with the Invacom LNB
Hispasat 30° West spectrum with a coaxial LNB ABS1 75° East spectrum with a coaxial LNB
BADR 26° East signal measurement with an NSS7 22° West signal measurement with an ABS1 75° East signal measurement with an
Invacom OptiScan and an optical flange LNB Invacom OptiScan and an optical flange LNB Invacom OptiScan and an optical flange LNB
58 TELE-satellite — Global Digital TV Magazine — 04-05/2010 — www.TELE-satellite.com
4. عند مفقارنته مع الكابل المحوري بغض النظر عن مدار القمر بتمديد كابل الياف ضوئية من ليس عندما تريد تزويد اكثر من
، يقدم كابل االلياف الضوئية الصناعي الذى حركنا الطبق وحدة خفض الضجيج الى مركز 001 شقة .
تحسنا ملحوظا في جودة االشارة باتجاهه او عدد اجهزة االستقبال االختبار الخاص بنا . يرجع الفضل
عند التعامل مع االشا رات الضعيفة التى قمنا بتوصيلها بوحدة المحول لالطوال الجاهزة للكابالت و التى يجب ان يكون االستقبال في
جدا و هذا بشكل فارق بين نجاح ( )GTUفي نفس الوقت ، فان نتائج تت راوح بين 01 – 03 – و 05 متر هذه الحالة كامال و حتى في
االستقبال او فشله . يمكن تغطية االستقبال كانت جيدة جدا و ظلت و لسهولة توصيل هذه الكوابل فقد اقوى العواصف الممطرة و يمكن
مسافات بالكيلومت رات بدون اى ثابتة عبر مجمل الطيف الترددي . تم االهتمام بهذه المهمة بسرعة . تحقيق ذلك اذاكان هناك ممانعة
اضعاف و توهين لالشارة . لقد قامت كافية للطقس السيئ . يعني هذا
شركة انفاكوم العالمية باختبار هذا مشكلة توهين و اضعاف االشاررة بالمقارنة مع الكابل المحوري استخدام اطباق ذات قطر اكبر و
ميدانيا . احدى االيجابيات االخرى المتعدد الذي كنت لت راه في كابل الغير حساس للت راب فان كابل عادة ما يستخدم المحترفون اطباق
هى انخفاض التكلفة المادية ( كابل محموري طويل بسبب اختالف االلياف الضوئية يجب الحفاظ رئيسية التركيز لهذا الغرض . في
االلياف الضوئية يكلف نحو 52.1 النطاقات الترددية المستخدمة ال عليه نظيفا . المشكلة ليست في الوقت الذى تق رأ فيه هذا الموضوع
يور ، محول ثنائي المخرج يكلف يمكن ان تكون موجودة باستخدام الكابل نفسه حيث ان الغالف ستكون شركة انفاكوم العالمية قد
نحو 52 – 03 يور ، محول رباعي كابل الياف ضوئية . فبذلك ال الخارجي للكابل معدني و يتيح قدمت وحدة خفض ضجيج مصممة
المخرج يكلف نحو 06 – 07 يوجد فقدان خالل بث االشارة من لك حني او ثنى الكابل كما تريد خصيصا لالستخدام مع االطباق
يور. و محول ( ))GTUيكلف نحو وحدة خفض الضجيج للمحول . يجب ان تركز اهتمامك على الرئيسية التركيز : و هى وحدة
002يور بالمقارنة مع المحوالت ، يعتبر هذا حل مثالي لمزودي نظافة نقاط التوصيل الموجودة في خفض ضجج 021 . C
المتعددة المكلفة . خدمات كوابل التلفزيون و الذين كال طرفى الكابل . يمكن ان تقدم
يريدون توصيل افضل اشارة ممكنة شركة انفاكوم العالمية قماش خاص سنحت لنا الفرصة الختبارعينة
استكملت شركة انفاكوم العالمية لمحطاتهم المركزية . للتنظيف و الذى يمكن استخدامه من وحدة خفض الضجيج ، تبدو
تشكيلة وحدات خفض الضجيج لتجهيز نقاط التوصيل قبل مطابقة لوحدة خفض الضجيج
الضوئية بتقديم وحدة خفض تاتي نسخة وحدة خفض الضجيج توصيلها لوحدة حفض الضجيج او القياسية ما عدا انه ال يوجد بها
الضجيج ذات الحواف . يمكن ذات الحواف عادة بجميع مميزات صندوق التحويل .
تجميع للتغذية . تكون وحدة
الجديدة التكنولوجيا استخدام النسخ العالمية : يمكن نقل االربعة التغذية مثبتة بشكل دائم في الطبق
مع االطباق االكبر في الحجم من مستويات الخاصة باالشارة في عند الطرف المتلقي قمنا بسرعة
و بهذا تحتاج وحدة خفض الضجيج
8.1 متر و هذا يجعل وحدة خفض كابل واحد في نفس الوقت . بسبب بتوصيل كابل االلياف الضوئية
ان يتم توصيلها عبر الثمان فتحات
الضجيج الضوئية اكثر جذبا انعدام توهين االشارة ، يمكن تقسيم القادم من وحدة خفض الضجيج الى
الموجودة في الواجهة االمامية
للسوق االحت رافي االشارة بالعدد المطلوب . كل صندوق تحويل ( )GTUرباعي
باستخدام اربع ب راغي موجودة
مخرج يتلقى اعلى مستوى لالشارة المخرج و الذي كان يستخدم
ضمن العبوة .
يمكنا ان نرى في نهاية المطاف و يمكن تشغبله بشكل مستقل تماما لتوصيل جهاز تحليل اشارة و جهاز
في السوق اجهزة استقبال يمكنها عن االخرين . نحكم بالطبق و الذي مسؤوليته
ادمج المصممون وحدة تزويد
معالجة كابل االلياف الضوئي تحريك الطبق .
طاقة خارجية النه ال يمكن تزويد
مباشرة دون الحاجة لمحول . هذا يمكنك ايضا تمديد كوابل الياف
وحدة خفض الضجيج بالطاقة
من شانه ان يلغي الحاجة الى ضوئية لمسافات طويلة جد دون بدأنا باختبار وحدة خفض
عبر كابل االلياف الضوئية ، يتم
عناصر اضافية و من شانه ايضا الحاجة للقلق من فقدان االشارة . الضجيج بعد فترة و جيزة من ضبط
توصيل الطاقة الخارجية لوحة
تقديم اشارة بدون فقدان اى شئ. يمكن تمرير الكابل عبر اى انبوب موقع الطبق و النتائج االولية كانت
خفض الضجيج عبر موصل . F
و يجعل عملية توزيع االشارة من او قناة و بفضل فقدان االشارة الذي مدهشة . كنا نتوقع ان تكون النتائج
افضل من استخدام وحدة خفض بهذه الطريقة يمكن استخدام كابل
وحدة حفض الضجيج الى جهاز ال يذكر فهو مثالي تماما لالستخدام
ضجيج قياسية و لكن الفروقات محوري من نظام فضائي موجود
االستقبال غير محدودة . في المسافات الطويلة ( في حالتنا
كانت كبيرة جدا . لتزويد وحدة خفض الضجيج
كانت المسافة 08 متر من الطبق
بالطاقة دون الحاجة الى تمديد خط
الى محلل االشارة خاصتنا ) .
لم تكن وحدة خفض الضجيج كهربائي مخصص لذلك .
:Signal Measurements الضوئية اكثر حساسية من وحدة
خفض ضجيج بمعدل 3.0 ديسيبل ياتي مع عبوة وحدة خفض
:Optical Flange LNB تستخدم مخرج محوري فقط , و الضجيج حلقة مطاطية للحماية
Satellite Transponder Level MER لكن لم يكن هناك فقدان ملموس من الطقس و ياتي ابضا موصالت
BADR 26° East 11919 H 67.4 dBµV 9.6 dB لالشارة رغم استخدام كابل الياف ( Fانثى النثى)
HISPASAT 30° West 12458 V 76.4 dBµV 13.1 dB
ضوئية بطول 08 متر يصل من
NSS7 20° West 12735 H 72.8 dBµV 12.1 dB
وحدة خفض الضجيج الى جهاز التركيب
ABS1 75° East 12640 V 68.0 dBµV 8.7 dB
االستقبال .
:Coaxial Flange LNB
قمنا بتثبيت وحدة خفض
Satellite Transponder Level MER يمكن رؤية هذا على جهاز الضجيج على طبق ( )IRTEبقطر
BADR 26° East 11919 H 54.4 dBµV 6.5 dB تحليل االشارة خاصتنا باعلى 3 امتار و قمنا بتوصيل الكابل
HISPASAT 30° West 12458 V 59.6 dBµV 12.7 dB مستوى لالشارة فيه و كان هناك الالزم . استخدمنا الكابل المحوري
NSS7 20° West 12735 H 53.3 dBµV 10.6 dB
معدل تضمين خطأ ( )MERأفضل الموجود في المكان لتزويد وحدة
ABS1 75° East 12640 V 52.0 dBµV 7.4 dB
بشكل ملحوظ . خفض الضجيج بالطاقة و قمنا
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