Implementace pozemního TV vysílání (DVB-T) v Polsku
Aktuální seznam aktivních vysílačů pozemní TV v Polsku je dostupný zde.
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Country specific information for Poland is available at our Polish website.
Country specific information for Poland is available at our Polish website.
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Coverage maps for different multiplexes in Poland -
country specific information is available at our Polish website.
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Digital Video Broadcasting Projekt (DVB) je asociace sdružující přes 250 vysílačů, výrobců, síťových operátorů, poskytovatelů softwaru a regulátorů ve více než 35 zemích, založená k vývoji počátečních standardů pro dodávání digitální televize, multimédií a datových služeb. Služby podle DVB standardů jsou dostupné na všech kontinentech, přístupné více než bilionu přijímačů.
Digitální terestriální televizní systémy přenáší komprimované dogitální audio/video přenosové signály (MPEG-TS). Výhodou tohoto řešení je možnost vysílání několika programů a poskytování služeb jako je EPG (Electronic Program Guide) v jednotlivém signálu. V závislosti na standardu systém používá MPEG-2 nebo více pokročilou MPEG-4/H.264 kompresi.
New TV sets:
DVB-T signal can be received without any additional equipment by all televisions equipped with MPEG-4 tuner. However, there may appear on sale older TVs that can receive only MPEG-2 broadcasts.
Older televisions
Older TVs - mainly CRT, but also LCD and plasma without MPEG-4 tuners have to equipped with an external DVB-T tuner, usually called STB (set-top box).
DVB-T signal can be received without any additional equipment by all televisions equipped with MPEG-4 tuner. However, there may appear on sale older TVs that can receive only MPEG-2 broadcasts.
Older televisions
Older TVs - mainly CRT, but also LCD and plasma without MPEG-4 tuners have to equipped with an external DVB-T tuner, usually called STB (set-top box).
A convenient, low cost and multi-purpose STB significantly increasing functionality of older TVs is:
DVB-T receiver with PVR function
and multimedia player
Signal HD-507
Signal HD-507 A99250
Signal HD-507 A99250 is the only device on the market, which in a small, practical case houses DVB-T receiver and multifunctional multimedia device. The use of this digital receiver is one of the cheapest ways to adapt an older CRT, LCD, or plasma television (if the LCD or plasma TV has only an MPEG-2 tuner) for the new world of digital television using MPEG-4. Even the owners of fully-featured televisions equipped with MPEG-4 tuners may also be interested in such a multifunctional device due to its integrated media player and Personal Video Recorder option (PVR Ready - possibility of recording DVB-T broadcasts on external USB memory). Signal HD-507 can also play pictures, music and videos - including those in high definition.
The biggest practical advantage of the A99250 receiver is compact size. The device can be directly plugged into the SCART input of a TV set - it remains virtually invisible to the user. The receiver is also ideal for any LCD/Plasma TV placed on a wall - depending on the TV model and mount, the user can arrange the device so that it fits in between the TV set and wall (adequate ventilation is required).
Hidden behind the television, the device receives commands from remote control via IR sensor on a short cable. To work properly, the sensor has to be attached somewhere on the front of the TV set.
The receiver is compatible with the most popular MPEG-4 compression standard and with the earlier version - MPEG-2 - used in some European countries. The device provides excellent image quality both in SD and HD resolution. The USB port (PVR Ready) allows to record the received broadcasts on external data storage device, such as a USB hard drive or a flash drive.
HDMI output provides signal of the highest quality, suitable for HD broadcasts. Using this connection, the receiver can be plugged into the SCART socket or not. With the simultaneous use of both types of connections, HDMI has priority.
The biggest practical advantage of the A99250 receiver is compact size. The device can be directly plugged into the SCART input of a TV set - it remains virtually invisible to the user. The receiver is also ideal for any LCD/Plasma TV placed on a wall - depending on the TV model and mount, the user can arrange the device so that it fits in between the TV set and wall (adequate ventilation is required).
Hidden behind the television, the device receives commands from remote control via IR sensor on a short cable. To work properly, the sensor has to be attached somewhere on the front of the TV set.
The receiver is compatible with the most popular MPEG-4 compression standard and with the earlier version - MPEG-2 - used in some European countries. The device provides excellent image quality both in SD and HD resolution. The USB port (PVR Ready) allows to record the received broadcasts on external data storage device, such as a USB hard drive or a flash drive.
HDMI output provides signal of the highest quality, suitable for HD broadcasts. Using this connection, the receiver can be plugged into the SCART socket or not. With the simultaneous use of both types of connections, HDMI has priority.
The question is often asked by our customers. Generally speaking, digital TV does not require to use new types of antennas. Yagi-Uda arrays or even typical broadband antennas can receive digitally modulated signals. Of course, everything depends on the place of reception and the local signal propagation conditions.
However, DIPOL has marked a certain group of antennas as "DVB-T". What is the reason? Analog terrestrial signals are broadcast at frequencies up to 782-790 MHz (channel 60). Therefore, the most installed UHF antennas have been designed to work within the range of 21 to 60 ch. DVB-T broadcasting can use channels up to 69, so the need for antennas working in the entire UHF band - from 21 to 69 channel.
However, DIPOL has marked a certain group of antennas as "DVB-T". What is the reason? Analog terrestrial signals are broadcast at frequencies up to 782-790 MHz (channel 60). Therefore, the most installed UHF antennas have been designed to work within the range of 21 to 60 ch. DVB-T broadcasting can use channels up to 69, so the need for antennas working in the entire UHF band - from 21 to 69 channel.
Some DIPOL antennas operating within 21-69 channel range
For analog signals the most important parameters that should be measured are the levels at the input of the distribution network and the C/N (carrier to noise) ratios.
Due to the nature of digitally modulated signals it is impossible to distinguish a single carrier - the signals are similar to noise and C/N measurements are not relevant. In addition, in the case of a digital signal the most important thing is not the signal level, but its quality which is determined by a number of parameters described below.
Due to the nature of digitally modulated signals it is impossible to distinguish a single carrier - the signals are similar to noise and C/N measurements are not relevant. In addition, in the case of a digital signal the most important thing is not the signal level, but its quality which is determined by a number of parameters described below.
Professional DVB-S/S2, DVB-T, DVB-C, and analog signals analyzer Rover Scout ST2+ R10830
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