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DVB-T vs. DVB-C Tuners: Comparing Terrestrial & Cable TV Reception Capabilities and Compatibility

xntxnt 169151 20
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #1 7664201
    xntxnt
    Level 14  
    There is one issue that interests me ...
    You can buy a TV with a DVB-T tuner but without DVB-C (let's skip MPEG2 / 4 decoding completely) - to receive digital terrestrial TV. You can also buy a DVB-C tuner (usually as a "set-top box") - if you want to receive a signal from a digital cable TV on an old TV set ...

    But How will a DVB-C set-top box connected to a terrestrial antenna (directed at a transmitter with DVB-T broadcasting) behave and vice versa: how will a DVB-T tuner connected to a digital cable TV with DVB-C signal behave?

    Is there any chance of any pickup at all?
    Or is it just about the bandwidth differences that the heads of these tuners can pick up? - I am writing this because ... is there any similarity to analog TV, where some channels can only be found in the cable, and others both in the cable and in the air?
    So Will it be a complete failure, or maybe ... the DVB-C tuner can handle terrestrial without any problem, but DVB-T will only receive some channels from the cable?

    Of course, I know that there are TV sets with both tuners (or also with an analog one). My questions are purely theoretical. There is no digital broadcasting in my region yet, only the local cable TV started testing with DVB-C - I just don't have anyone to ask about it, maybe some of you will know.
    thanks for the answers :)
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  • #2 7665288
    lpm11
    Level 22  
    DVB-T is digital terrestrial television. Not wired.
    Conversely: DVB-C is digital cable TV.
    Technologies differ in the way data is transferred, so the answer to the first question: It will not do anything. It just won't find the programs. In both cases. Well, unless you have such a strong DVB-T signal that a standard cable will be a sufficient antenna .. but that's not what you meant. If you want, invest in a TV with both tuners. As far as I know, they are inexpensive Samsung .. with both tuners.
  • #3 7665309
    noespa
    Level 13  
    as above it will not work.

    diesel engine does not run on gasoline :)
  • #4 7665715
    xntxnt
    Level 14  
    Approx. Although I do not feel fully convinced :) . Because I know that C = cable, T = terrestial, so it's kind of obvious. But what are the technical differences? Maybe completely different frequencies, or some other modulation? ... - that's what I mean.

    In analog, when cable cables started to come in, people massively gave TV to services for rework (head replacement?) So that it would receive the entire bandwidth. In the case of DVB tuners, could it also boil down to such a thing?
    The fact that this is a relatively new topic in Poland, but maybe some of the practitioners will have their say?

    Of course, I am still asking only theoretically. I do not intend to buy any TV in the near future, let alone rediscover electricity ;) (making some modifications).
  • #5 7666582
    xntxnt
    Level 14  
    Don't overdo it.

    I mean the characteristic distinguishing features of DVB-C and DVB-T systems.
    There is a lot of descriptions of DVB-S technology, because it is quite old. Everyone knows there is a converter or a DiSEqC. The mere fact that the IF range is higher than that of terrestrial TV disqualifies this equipment from DVB-C and DVB-T. But what's the difference between -C and -T? As you know, say it.
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  • #6 7666631
    telesat1
    VIP Meritorious for electroda.pl
    Defines what signal the decoder can receive. Col. Imp wrote it clearly.
  • #7 7666792
    xntxnt
    Level 14  
    So: what are the differences between DVB-C and DVB-T signal? Putting aside the fact that -C is in the cable and -T is in the ether.

    Don't treat me to a moron. Your answers are of no use, you tell me the obvious, and I'm asking something else.
  • #8 7666873
    telesat1
    VIP Meritorious for electroda.pl
    Wikipedia. Regulations p.14, 16. Possibly Beginner Science section.
  • #9 7685279
    lpm11
    Level 22  
    Analog cable probably works like regular analog TV.
    Therefore, it was enough to change the reception frequencies and you could catch after tuning. As far as I understood correctly ..

    For DVB-T you have OFDM modulation
    For DVB-C you have QAM modulation.
  • #10 7695061
    username
    Level 15  
    What will cable networks do now? After all, they have a lot of users of the basic package (1,2,3 POLSAT TVN), etc. It follows that when they switch to DVB-C, they will have to either give people a set-top-box + card or figure out something to make it go for DVB-T. Providing a DVB-C signal with a standard package does not make sense and exposes to break the key (DVB-C only flashes with the decoding card, which would soon be broken in the event of no decoder-card pairing).
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  • #11 7700224
    PiotrEtenM500
    Level 19  
    Most of the cable cables have already done this :) subscribers received DVB-C terminals
  • #12 8395170
    malakser1
    Level 1  
    I will ask you with a similar question. Namely, he plans to buy a Hyundai MBox R3150s DVR player http://www.apex24.pl/go/_info/?id=19336&partn...5252525&code=b965da1e366cf8a6a16fea97420cd885. I would like it to function as a digital video recorder. The TV signal I have available is only cable TV that broadcasts in DVB-C (probably analogue too). In the description of this device it says "TV tuner with recording (digital, DVB-T, MPEG-4)" And hence the question whether I will be able to record programs from cable TV? I already found out what is DVB-T and MPEG-4 encoding, but the word "digital" in the description is very general :(
    PS. The equipment will be used in Poland.
  • #13 8418417
    lpm11
    Level 22  
    DVB-T = digital terrestrial television
    DVB-C = Digital Cable TV
    If you connect this DVB-T player, you will NOT receive and record the digital cable channels on it.
  • #14 8481373
    TarzaN
    Level 14  
    I have a TV with an mpeg-4 digital tuner, after connecting to the cable (INEA), I scanned the band in "cable" mode and found all the programs that the STB receives. Of course the channels were encrypted but the basic ones were unlocked and you could watch them normally (tvp1, tvp2 etc).
  • #15 8509111
    zyga4don
    Level 11  
    Both DVB-T and DVB-C can be played by cable,
    usually tvk chooses dvb-c because you can code programs and play with packages, etc., for example, we have everything done in dvb-t by tvk, which just decided not to wait anymore for the digital terrestrial and everything flashes great
  • #16 8808051
    zbyck
    Level 11  
    And as it is with this DVB-C reception, just like "TarzaN" I scanned the cable band, I caught 64 digital TV channels, of which 3 I receive as unencrypted, do I need a decoder-settopbox with a card to further decode, or is it enough to let the cable signal on my address and I will have the rest of the channels decoded for the right price. Do I have to have a module and a card that I put on the side of the TV?
  • #17 8933212
    fantom
    Level 31  
    lpm11 wrote:
    Analog cable probably works like regular analog TV.
    Therefore, it was enough to change the reception frequencies and you could catch after tuning. As far as I understood correctly ..

    For DVB-T you have OFDM modulation
    For DVB-C you have QAM modulation.


    DVB-T also has QAM transmitted over OFDM and DVB-C has QAM transmitted on a single carrier.
  • #18 8951348
    Koolo
    Level 18  
    So if you have, for example, TV only with DVB-T, nothing will catch on the cable, will you be able to watch some basic package?
    For example, whether such a monitor http://www.ceneo.pl/7766107 has DVB-C or not because I can't read anywhere.
    This is a quote from the lg website "TV tuner for analog and digital (MPEG4) reception in Full HD resolution."
    The manual also includes "DIGITAL CABLE SETTINGS" but the specific standards are not mentioned ;-)
  • #19 8951386
    fantom
    Level 31  
    Koolo wrote:
    So if you have, for example, TV only with DVB-T, nothing will catch on the cable, will you be able to watch some basic package?
    Is, for example, such a monitor http://www.ceneo.pl/7766107 has DVB-C or not because I can't read anywhere


    Theoretically, DVB-C is "simpler" than DVB-T, but the transmission standard is still different, so it also requires a different software. On the other hand, check if your cable TV does not transmit DVB-T digit, because then there is no problem. If they do not provide decoders, it probably is. I do not see that this monitor supports any digital TV standard, it only has an analog TV tuner (at least that's what the description says).
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  • #20 8972532
    Kajdano
    Level 2  
    Hello, I am green in the subject and I have an important matter. Currently I have analog TV on cable and I'm going to take a bigger digital package etc. I have a LG 47 '5000 TV set and from what I read it has DVB-T. I would rather take a CAM card instead of a decoder because it comes out cheaper and now the question is because from what I know, this CAM card is only for DVB-C and would everything work normally or if my TV only has DVB-T, I have to take a decoder?
  • #21 9017423
    fantom
    Level 31  
    Kajdano wrote:
    I would rather take a CAM card instead of a decoder because it is cheaper


    If cable TV broadcasts in DVB-C, you need both a decoder and a CAM card.

Topic summary

DVB-T (Digital Video Broadcasting - Terrestrial) and DVB-C (Digital Video Broadcasting - Cable) are distinct technologies for receiving television signals, with DVB-T designed for terrestrial broadcasts and DVB-C for cable networks. Users inquired about the compatibility of DVB-C set-top boxes with terrestrial antennas and vice versa, leading to the consensus that these devices are not interchangeable due to differing modulation techniques and frequency ranges. DVB-T utilizes OFDM (Orthogonal Frequency-Division Multiplexing) while DVB-C employs QAM (Quadrature Amplitude Modulation). Some users reported success in receiving basic unencrypted channels from cable networks using DVB-T tuners, but generally, a DVB-C tuner is required for proper reception of cable signals. The discussion also touched on the necessity of decoders and CAM cards for accessing encrypted channels in cable TV setups.
Summary generated by the language model.
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