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DIPOL Weekly Review - TV and Sat TV, CCTV, WLAN
No. 12/2008 (March 31, 2008)
More RFID, less privacy. Wider adoption of RFID technologies provokes protests of citizens' groups and movements against possible interference in people's lives.
RFID solutions allow to control not only certain zones or areas (e.g. border zone, airports), but also enable remote scanning of the embedded and dynamic data, get access to information on the people and their relocations, and can provide control authority (in the sense of access rights to certain zones etc.).
Many countries plan to introduce identity cards, passports and car registration plates with RFID tags. By the end of this year, China wants to issue for its citizens about a billion such identity cards. American passports issued after Oct. 6, 2006 are also equipped with RFID tags. The embedded data (including digital photograph) can be read even over a distance of 20m.
Civil liberties campaigners have criticized the test of anti-theft system based on tiny RFID chips at Tesco store in Cambridge. Anyone picking up Gillette Mach3 razor blades at the store triggered CCTV camera and had his or her picture taken. The second one was taken at the checkout, to compare the pictures of the customer.

Expansion of RFID technology. RFID (Radio Frequency IDentification) systems enable data to be transmitted by mobile devices, called tags, that are read by RFID readers. The data is then processed according to the needs of a particular application. There are used several typical frequency ranges: 125 - 134 kHz (LF), 13.56 MHz (HF), and the most popular - 865-952 MHz (UHF) and 2.4 GHz (microwave).
The application areas include transport, supply-chain management, identification of people and animals.
As mentioned, an RFID system consists of identifiers (tags), reader/s and managing (host) computer. There are used two kinds of tags: active and passive. The first ones have to be powered by a battery etc., the second - take the energy needed for operation directly from the reader (as the part of electromagnetic energy emitted by its antenna).

Active tag equipped with battery, mounted on the car license plate, allows to read the data of the car and its owner even over a distance of 500m
The European championships in photographing antennas. Every year we invite everyone to take part in the photo contest "Engagingly about antennas". Aside from this website, the contest will be announced in the newsletters: Heti Hírmondó, TV-SAT, CCTV, WLAN and ..........
The pictures can be submitted from June 1st, 2008 to September 30, 2008.
The first prize - SAT HDTV receiver - Ferguson HF 8800 HD.

Rules of participation.

The pictures from 2007.
"Modern" storks have built their nests on this huge antenna near Madrid
Reception of adjacent channels in antenna installations. In the last newsletter we have written about receiving adjacent channels in large antenna systems, with a great number of subscribers. In that case there are usually used professional solutions based on channel converters and amplifiers from ALCAD.
In smaller installations, an economical solution is use of TV channel converter R87205 which consists of demodulator and DSB modulator. DSB modulators require to use one-channel gap below the active channel.
Sygnał z instalacji antenowej dzielimy na rozgałęźniku, następnie w jednej z gałęzi dokonujemy wytłumienia kanału o wyższym poziomie. Kanał o mniejszym poziomie przenosimy w inne miejsce. Przesunięty kanał sumujemy z kanałem silniejszym. Nie ma konieczności eliminacji produktów pasożytniczych przemiany, ponieważ w istocie mamy tutaj demodulację i powtórną modulację. Zastosowany wzmacniacz AWS-1036 B11686 ma zadanie jedynie wzmocnić zsumowane sygnały.
UHF TV Antenna: DIPOL 44/21-69 Tri Digital2-Way TV/FM Splitter R-2 SignalFourfold Tuned Filter FR-413 ALCADTV Channel Converter: Mixpol PTM-5002-Way TV/FM Splitter R-2 SignalIndoor antenna amplifier AWS-1144 47-862MHz 4-out 13/15dB
Application of R87205 channel converter for elimination of interferences from a stronger adjacent channel
MSR Multiswitches from Terra - modern concept of multiswitch systems. The most flexible multiswitch installations in multi-story buildings are based on 9-cable system (signals from two Quatro LNBs and terrestrial TV antenna). On each floor we employ the splitter providing signals to multiswitches. It allows to shape the network according to actual requirements - we may deploy practically unlimited number of outlets.
TV/Sat tap Terra SS-510 (R70516) jest stosowany w instalacjach multiswitchowych do wydzielenia sygnału z magistrali. Magistrala multiswitchowa z sygnałem z jednego konwertera Quatro składa się z czterech przewodów. Dodatkowo odgałęźnik wydziela także sygnał TV naziemnej. Odgałęźnik posiada przełącznik przejścia stałoprądowego, który ustawiony w pozycję
SAT/TV TAP: Terra SS-510SAT/TV TAP: Terra SS-510SAT/TV TAP: Terra SS-510SAT/TV TAP: Terra SS-5109/16 Multiswitch: Terra MSR-916 (active terrestrial path)9/12 Multiswitch: Terra MSR-912 (active terrestrial path)
Application of MSR-912 multiswitches in 9-cable systems
Connection of IP cameras to local network. IP CCTV devices posiadają fabrycznie wpisane adresy IP. Każdy producent ma inny adres. Zwykle okazuje się, że ta adresacja jest niezgodna z siecią, do której zamierzamy je podłączyć.
Błędem jest konfiguracja kart sieciowych w celu dostosowania adresacji IP do urządzeń CCTV IP.
Do każdego urządzenia CCTV IP powinna być dołączona płyta zawierająca oprogramowanie umożliwiające wyszukanie i zmianę adresu IP urządzenia.
W ten sposób, można szybko dostosować urządzenie do potrzeb sieci.
W zależności od firmy, są różne programy, które się tym zajmują. Dla urządzeń IP firmy IQinVision dodawany jest program IQ Finder, dla urządzeń ACTi - program IP Utility, natomiast dla PiXORD-a - program IP Installer.
Screenshot from PiXORD IP Installer
ACTi IP Utility
+++Motion detection
Example window (motion detection sensitivity) from ACTi camera
Universal CCTV Tester - TOMEK-8. Tester of lens, cameras and monitors, and CCTV signal meter "Tomek-8" is a universal device providing invaluable service while starting up new CCTV systems as well as maintaining and repairing the existing ones. The tester has the following functions:
  • Measurement of power voltage.
  • Indication of improper polarity of supplying voltage.
  • Measurement of ripples.
  • Measurement of video signal.
  • PAL generator.
  • Control of lens ZOOM.
  • Control of lens FOCUS.
  • Opening and closing diaphragm in lens with automatic aperture control.
PAL generator can generate various patterns:
  • "grate" (black or black and white). The P1 grate pattern allows to estimate monitor's linearity or, in other words, deformation of imaging. The P2 grate pattern enables to assess the level of reflection, if it occurs. Reflection is caused by mismatch of a receiver (the load) and the transmission line, and usually is noticeable with longer transmission lines. On a screen it can be seen on the right side of the boundaries between light and dark objects (and vice versa).
  • "vertical bars". Vertical bars with graded level of luminance allow to check and adjust proper levels of contrast and brightness in a monitor. All bars should be well distinguished. If some, mostly the outermost bars are seen as identical, it means that picture parameters are not suitably adjusted and need some correction. It is essential for proper observation of details in pictures from cameras.
  • "white background" and "black background". They permit to assess number of damaged pixels, especially on LCD monitors.
  • "gray background". Gray background is suitable for the above purpose, too, and may be used for testing the level of magnetization of color picture tubes. The magnetization may be caused by any close devices generating strong magnetic fields, like mains transformers, electromagnets, loudspeakers. The effect is seen as no great tinges, mainly near the outer edge of the screen. The device used for demagnetizing, or degaussing, the aperture mask and metal-bell portion of a color picture tube is external air-core electromagnet - degaussing coil. In most common situations, when the level of magnetization is not high, it is sufficient to use the inner degaussing circuit, mostly present in color monitors. The gray background is also suitable for finding such effects like "burnt" areas in the screen, produced by static pictures. Often it may be noticed e.g. in QUAD applications, where a dark cross comes into being in the center of the picture.
The gray background generated by Tomek-8 M2508 is suitable for identification of bad pixels (also in luminophore) or magnetized CRT
Ratification of 802.11n standard delayed. The standardization efforts have been in progress since 2004, and the final agreement is still a subject to ratification, probably till mid-2009 (instead of the beginning of 2008). But the approval of the set of agreements called Draft 2.00 (in January 2007) 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.
802.11n devices utilize MIMO technology - the use of multiple antennas at both the transmitter and receiver to improve communication performance. The devices may operate in several channels which multiplies their transmission capacities. The manufacturers like to boast about the maximum transmission speeds they offer, but also ensure that the minimum throughput is at least 100 Mbps (similar to Fast Ethernet). Such speed is satisfactory for effective wireless transmission of multimedia.
There are available "n" (draft 2.0) devices. TP-Link offers Access Point integrated with a router and switch - TL-WR841N N3251 and PCMCIA card - TL-WN910N N3231. They allow to transfer data up to 300 Mbps (raw data rates), being backwards compatible with 802.11b and 802.11g devices.
Current 802.11 standards


Data rate




2 Mbps

2.4 GHz

1997 (curr. marked as 802.11y)


54 Mbps

5 GHz

1999 (hardware available since 2001 )


11 Mbps

2.4 GHz



54 Mbps

2.4 GHz



250-500 Mbps

Currently 2.4 GHz (5 GHz possible)

under standardization

Wireless PCMCIA Adapter: TP-Link TL-WN910N (802.11n - draft 2.0 - 300Mbps)Access Point 802.11n (draft 2.0): TP-Link TL-WR941N <br />(300Mbps, built-in router and 4-port switch)
TP-Link devices allow to reach data rates up to 300 Mbps
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