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No. 26/2008 (Aug. 25, 2008)
"Engagingly about antennas" - the number of entries is growing. A few dozen pictures have already been sent to the competition. We are still waiting for your works - by the end of September.
Due to vacation time many of the pictures are taken all over the world. Click on the link above or one of the pictures below to see the collection of the entries.
Due to vacation time many of the pictures are taken all over the world. Click on the link above or one of the pictures below to see the collection of the entries.
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Out of love for antenna - Filip Wyporski
Brilliant TERRA MMH-3000 headend already available. Digital headend MMH-3000 from TERRA is a compact headend solution for the reception of DVB-S and DVB-T programs for analog redistribution in SMATV and small CATV networks, e.g. in hotels, boarding houses, multi-family houses, housing developments. Thanks to vestigial side band modulators it allows to utilize adjacent channels. The base unit can be installed into a standard 19" rack. The unit incorporates power supply, RF amplifier, and intelligent data bus. It may hold up to 8 individual modules - digital satellite or terrestrial receivers and RF modulators.
Main features:
- possibility of receiving a number of encrypted programs with a single card
- PC-controlled and programmed
- access to the system log (events)
- possibility of SMS alarms (via PC GSM terminal)
- graphical representation of adjusted parameters
- VSB modulators
- detailed user manuals (assembling, programming, diagnostics) in English, Lithuanian, and Polish
- 2-year warranty
- competitive price
Terrestrial HD broadcasts. Growing popularity of HD televisions and start of terrestrial high-definition broadcasts give rise to demand for receiving equipment.
The HD DVB-T tuner - T-501 A99078 - has been prepared for receiving digital terrestrial TV broadcasts with MPEG-4 compression. This standard has been adopted in Poland and many other European countries. The MPEG-2 multiplexes that are still used in the countries will be replaced by the newer standard.
The HD DVB-T tuner - T-501 A99078 - has been prepared for receiving digital terrestrial TV broadcasts with MPEG-4 compression. This standard has been adopted in Poland and many other European countries. The MPEG-2 multiplexes that are still used in the countries will be replaced by the newer standard.
ULTIMAX - DVRs for demanding customers - system control unit. ULTIMAX DVRs can be fully managed via computer network. With Client program or even Internet browser, the remote users can have access to functions according to their access level (set by the administrator of the system). The functions include live monitoring, playback, PTZ control with a mouse.
However, control of PTZ cameras executed by a joystick is much more convenient. The producer of ULTIMAX DVRs has introduced dedicated system control unit DS-1003 M77920. The layout of the keyboard is identical to that of front panel of ULTIMAX DVRs. The joystick allows to navigate through the OSD menu.
Use of external control unit enables the operator to control DVR(s) without physical access to the device(s). The central unit of the system (DVR/s) can be put in a safe place. Another advantage is possibility of locating the control unit up to 1200 meters from the DVR(s) or PTZ camera. Transmission of video signal over longer distances requires to use active video transmitters, e.g. M1678 and M16741 (see the diagram below). More information on the control unit there is in the catalog page.
However, control of PTZ cameras executed by a joystick is much more convenient. The producer of ULTIMAX DVRs has introduced dedicated system control unit DS-1003 M77920. The layout of the keyboard is identical to that of front panel of ULTIMAX DVRs. The joystick allows to navigate through the OSD menu.
Use of external control unit enables the operator to control DVR(s) without physical access to the device(s). The central unit of the system (DVR/s) can be put in a safe place. Another advantage is possibility of locating the control unit up to 1200 meters from the DVR(s) or PTZ camera. Transmission of video signal over longer distances requires to use active video transmitters, e.g. M1678 and M16741 (see the diagram below). More information on the control unit there is in the catalog page.
Application of DS-1003 M77920 for control of ULTIMAX DVR (5xx or 7xx series) and PTZ camera
Modernization of analog CCTV systems - hybrid video surveillance with IP transmission. Increased functionality of IP CCTV systems (unlimited distances, access to advanced software supporting the operator/s) is the reason for growing share of IP solutions. The existing analog systems can be retrofitted with IP video/audio/control data transmission, which forms a hybrid structure.
Video servers can convert the video/audio/control signals from analog cameras into compressed stream (video and audio) and digital control signals (mostly PTZ). DIPOL offers video servers of ACTi, PiXORD, and based on H.264 compression - ULTINET devices. The video servers allow to implement IP solutions and expand the systems by adding next IP cameras.
Video servers can convert the video/audio/control signals from analog cameras into compressed stream (video and audio) and digital control signals (mostly PTZ). DIPOL offers video servers of ACTi, PiXORD, and based on H.264 compression - ULTINET devices. The video servers allow to implement IP solutions and expand the systems by adding next IP cameras.
CCTV in kindergarten - with access via the Internet. Many kindergartens would like to enable parents to watch their children during their stay in. The parents also want to know how their kids are doing there. Such installations are very simple, especially in the case of existing computer network based on a router. Network camera(s), being the next IP device(s), should be connected to the router with patch cable(s).
The installation becomes even simpler when the router has wireless access point. Using a wireless camera, e.g. P400W K1132, no additional cabling is required. It is enough to configure the camera and access point.
In a small kindergarten with a single computer directly connected to the Internet via ADSL or cable modem provided by the ISP, the installer needs to employ a router, e.g. N2990, or wireless router, e.g. N2950 (for a wireless camera).
The router has to be connected before the computer - the cable from the ISP to the WAN port of the router, the computer to one of its LAN ports (wired solution). The IP camera/s should be connected to another/other LAN port/s. In the case of a greater number of cameras there may be used additional switches, e.g. 5-port N29915, or 8-port N29918. To finish the implementation the installer has to configure the network devices and cameras.
Parental surveillance
The installation becomes even simpler when the router has wireless access point. Using a wireless camera, e.g. P400W K1132, no additional cabling is required. It is enough to configure the camera and access point.
In a small kindergarten with a single computer directly connected to the Internet via ADSL or cable modem provided by the ISP, the installer needs to employ a router, e.g. N2990, or wireless router, e.g. N2950 (for a wireless camera).
The router has to be connected before the computer - the cable from the ISP to the WAN port of the router, the computer to one of its LAN ports (wired solution). The IP camera/s should be connected to another/other LAN port/s. In the case of a greater number of cameras there may be used additional switches, e.g. 5-port N29915, or 8-port N29918. To finish the implementation the installer has to configure the network devices and cameras.
Parental surveillance
A simple and cheap CCTV system in kindrgarten
Fisheye megapixel lens - a breakthrough in the design and operation of CCTV. So far, low resolution of image sensors was the obstacle to monitoring extensive areas with wide-angle lens. The remedy was using PTZ cameras.
A new approach has been possible since introduction of megapixel cameras that enable the operator to enlarge fragments of an image many times, still ensuring precision of details. With wide-angle lens one fixed camera can cover a large area, providing overall review of the whole scene (a square, yard, intersection, part of a street etc.), with possibility of enlarging any interesting part of it, with no risk of omission that is probable in the case of PTZ camera.
The new functionality of modern CCTV equipment can be well illustrated by application of "fish-eye" lens from Japanese company Tokina (M2236) with megapixel cameras. The focal length of the lens is 1.4 mm, which translates into horizontal viewing angle of 185o. In practice it means that the camera can even look a little back!
A new approach has been possible since introduction of megapixel cameras that enable the operator to enlarge fragments of an image many times, still ensuring precision of details. With wide-angle lens one fixed camera can cover a large area, providing overall review of the whole scene (a square, yard, intersection, part of a street etc.), with possibility of enlarging any interesting part of it, with no risk of omission that is probable in the case of PTZ camera.
The new functionality of modern CCTV equipment can be well illustrated by application of "fish-eye" lens from Japanese company Tokina (M2236) with megapixel cameras. The focal length of the lens is 1.4 mm, which translates into horizontal viewing angle of 185o. In practice it means that the camera can even look a little back!
Multimedia home based on 802.11n wireless standard. The 802.11n standard enables data transfer speeds up to 300Mbps, which perfectly suits the needs for transmission of home multimedia. The 802.11n devices are compatible with the older 802.11b and 802.11g equipment.
Draft 2.00 moved the increasingly popular wireless networking technology a step further. Manufacturers and customers have been given reassurance that amendments to the final standard won't be essential, and the Draft 2.0 gear will cooperate with that compliant to the final version.
Draft 2.00 moved the increasingly popular wireless networking technology a step further. Manufacturers and customers have been given reassurance that amendments to the final standard won't be essential, and the Draft 2.0 gear will cooperate with that compliant to the final version.
All devices of TP-Link using "n" standard comply with Draft 2.0.
The offer includes:
The offer includes:
A reliable multimedia home-networking platform - 802.11n draft 2.0 devices of TP-Link
The basic security measures include:
- hiding the SSID
- MAC address filtering
- IP address filtering
- password protection (preferably WPA2 protocol)
In the popular access point TP-Link TL-WR542G N2950 with built-in router and 4-port switch all the protection measures can be configured via Internet browser, after logging into the device and setting them in the Wireless and Security menus.
More on configuration of TL-WR542G you can find in the Library of the LAN &WLAN section, in the article "How to configure a router".
The procedure is similiar in the case of the TP-Link TL-WR340GD N2951 (another AP with built-in router and 4-port switch). Below there are presented some screenshots from the menus.
More on configuration of TL-WR542G you can find in the Library of the LAN &WLAN section, in the article "How to configure a router".
The procedure is similiar in the case of the TP-Link TL-WR340GD N2951 (another AP with built-in router and 4-port switch). Below there are presented some screenshots from the menus.
MAC address filtering menu
IP address filtering menu
Wireless settings menu
We have written about:
Antenna system measurements. Knowledge of signal parameters, among others - differences in levels of useful signals, signal levels in subscriber outlets, BER, level of noise and interferences - allows to prepare optimal design and verify actual results...
- archive DWR of Nov. 19, 2007
Home and business Wi-Fi networks - applications of TP-Link family. ... When we want to use wireless Internet connection we need device supporting WISP mode...
- Library
Monitoring of dispersed locations - how to lower cabling costs. (Use of UTP cable for video transmission). When the distances between cameras and the monitoring center are long, the cost of cabling is a significant part of the total cost of the whole undertaking. As an example, video transmission from four cameras, located 300 m from the center, means that the coaxial cable will cost...
- archive DWR of Sept. 10, 2007
Index of published issues
Antenna system measurements. Knowledge of signal parameters, among others - differences in levels of useful signals, signal levels in subscriber outlets, BER, level of noise and interferences - allows to prepare optimal design and verify actual results...
- archive DWR of Nov. 19, 2007
Home and business Wi-Fi networks - applications of TP-Link family. ... When we want to use wireless Internet connection we need device supporting WISP mode...
- Library
Monitoring of dispersed locations - how to lower cabling costs. (Use of UTP cable for video transmission). When the distances between cameras and the monitoring center are long, the cost of cabling is a significant part of the total cost of the whole undertaking. As an example, video transmission from four cameras, located 300 m from the center, means that the coaxial cable will cost...
- archive DWR of Sept. 10, 2007
Index of published issues
