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Checking DVB-T Signal in Apartment Cable TV Installation without Tuner: Measuring Parameters

kaporwojtas 44301 28
Best answers

Jak sprawdzić, czy gniazdo antenowe w mieszkaniu jest podłączone do instalacji i czy jest na nim sygnał DVB-T bez użycia tunera?

Multimetrem nie sprawdzisz wiarygodnie, czy na kablu jest DVB-T; może on co najwyżej pokazać zwarcie/ciągłość przewodu albo jakąś składową DC, ale nie rozpozna sygnału RF [#13205804] [#13205877] [#13209385] Jeśli chcesz tylko ustalić, czy kabel jest fizycznie podłączony do instalacji, pomiar ciągłości może dać zwarcie lub małą rezystancję, ale to nadal jest tylko poszlaka, bo zależy od zastosowanego rozgałęźnika [#13209385] Do potwierdzenia obecności sygnału potrzebny jest tuner/TV z auto-strojeniem, prosta sonda HF/RF albo analizator widma; tuner jest najtańszym i najpewniejszym rozwiązaniem [#13205855] [#13205877] [#13209385] [#13380014] W wątku zaznaczono też, że u operatora typu Multimedia sygnał może być dostarczany jako DVB-C albo lokalny pakiet, a niekoniecznie jako czyste DVB-T [#13208068]
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  • #1 13205745
    kaporwojtas
    Level 10  
    The question will be simple or even lame. Well, I have a cable TV installation at home, which I have not used for some time. This cable TV is an operator in the block and has (recently) been providing DVB-T signal in its installation. Can someone kindly tell me how to check if the cable in my apartment carries the signal without connecting a tuner? I have all the devices built into the wall and I would like to have access to DVB-t in the event of a failure of my TV provider (which has happened frequently recently). What parameters should the signal in the cable have (can I check it with a multimeter).
    A noble group of heads full of knowledge in the field of electronics, I apologize for such a mundane question and ask for an answer at the same time.
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  • #2 13205804
    Futrzaczek

    VIP Meritorious for electroda.pl
    kaporwojtas wrote:
    Can someone kindly tell me how to check if the cable in my apartment carries the signal without connecting a tuner?

    Borrowing a tuner from someone is the simplest and cheapest solution.

    kaporwojtas wrote:
    if I can check it with a multimeter

    No, you are not.
    Company Account:
    F-TECH Michał Kurzela
    Zacisze 20B, Serock, 05-140 | Company Website: https://elektronika.top/
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  • #3 13205821
    kaporwojtas
    Level 10  
    Perhaps I will clarify the question. I have doubts whether the cable in my apartment is connected to the box on the cage (to which I do not have access) and I just want to determine that. Not the signal quality, etc., but only whether the cable is physically connected to the infrastructure or its other end is frivolously dangling in the "Multimedia SA" box in the basement of my block, where the box is located.
  • #4 13205830
    Futrzaczek

    VIP Meritorious for electroda.pl
    My experience (with the same company) shows that if you do not pay them a subscription fee, the cable hangs freely, not connected to anything.
    Company Account:
    F-TECH Michał Kurzela
    Zacisze 20B, Serock, 05-140 | Company Website: https://elektronika.top/
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  • #5 13205838
    kaporwojtas
    Level 10  
    I will not write about my experiences with this company because it is a topic for an epic. It was only through the Office of Competition and Consumer Protection that they heard my arguments, although they are the operator in my block, so the "AZART" and DVB-T packages should (must) be delivered in their cable. So until I am sure that the cable is dangling, I will not call my grandfathers because they have a disastrous effect on the peristalsis of my intestines and the mere conversation with their qualified staff disturbs my bowel movement policy.
  • #7 13205864
    kaporwojtas
    Level 10  
    Dear gentlemen! There must be some electrons flowing in this goddamn cable! Connecting a decoder will not dispel my doubts because I am not 100% sure that they transmit DVB-t signal there. In-laws in another block - so at a friend's in another, not. There has to be some voltage to the bright angel and there has to be some way to check it with a multimeter. I can't believe nobody knows!
  • #8 13205877
    Futrzaczek

    VIP Meritorious for electroda.pl
    You can connect a multimeter. Either he shows something or not. Especially if there is a DC component in it, the DC voltage should show. But whether it is DVB-T or something else, you won't know anymore. It is also possible that from the RF component the meter will just go crazy and show you who knows what or show zero. Therefore, the tuner is the surest solution.

    You can also equip yourself with a spectrum analyzer if you want so much :lol:
    Company Account:
    F-TECH Michał Kurzela
    Zacisze 20B, Serock, 05-140 | Company Website: https://elektronika.top/
  • #9 13205975
    kaporwojtas
    Level 10  
    Another example is that there are no easy solutions to easy problems. Thanks for the answers. I'm going for a decoder. I had a devilish idea how to check it. I was thinking about 230V AC for the cable and when the assemblers come, I will know that it was connected and if they do not come, it means that it was dangling. ;)
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  • #10 13206791
    Futrzaczek

    VIP Meritorious for electroda.pl
    kaporwojtas wrote:
    I was thinking about 230V AC for the cable and when the assemblers come, I will know that it was connected and if they do not come, it means that it was dangling.

    And if he stabs someone, you'll go to jail for being stupid ;) Not to mention damaged TV sets and other receivers.
    Company Account:
    F-TECH Michał Kurzela
    Zacisze 20B, Serock, 05-140 | Company Website: https://elektronika.top/
  • #11 13206802
    kaporwojtas
    Level 10  
    No worries! that was supposed to be a joke! I don't think even gimbus do such idiots. As I mentioned, I have a hard time with this company.
  • #12 13208068
    KOCUREK1970
    Network and Internet specialist
    kaporwojtas wrote:
    Well, I have a cable TV installation at home, which I have not used for some time. This cable TV is an operator in the block and has (recently) been providing DVB-T signal in its installation

    kaporwojtas wrote:
    Multimedia SA

    I am in a hurry to explain that MM provides DVB-T programming offer, BUT not in DVB-T technology, but DVB-C, so a colleague needs their set-top box with an active subscription to view such an offer anyway.
    No cable network, such as UPC, Vectra, MM, provides DVB-T signal via its cabling, and why, a colleague will look for it on the network.
  • #13 13209385
    SP5ANJ
    Rest in Peace
    Hello.
    kaporwojtas wrote:
    Another example is that there are no easy solutions to easy problems.

    The general concept of whether the cable is screwed onto the splitter connector can be to show on the multimeter that the cable has a "short circuit" (0.1 ? ;) .
    Unfortunately, it depends on the type / type of splitter used in the network TVK ablowa and it is not clear that you have a signal there, but only "presumption" that the cable is connected to something.

    Simple HF meter / diode doubler probe it will also show if there is a RF signal in a given cable. (we read: RTV).
    How to make a simple meter - you can search in the Radiocommunication section and enter the key words in the browser:
    - field meter
    - RF measurement
    - RF probe
    The cost of making such a probe is about PLN 3 - gross and the execution time is about 2 yellow liquids. :D

    Greetings.
  • #14 13209845
    stolarek_1988
    Level 21  
    KOCUREK1970 wrote:

    I am in a hurry to explain that MM provides DVB-T programming offer, BUT not in DVB-T technology, but DVB-C, so a colleague needs their set-top box with an active subscription to view such an offer anyway.
    No cable network, such as UPC, Vectra, MM, provides DVB-T signal via its cabling, and why, a colleague will look for it on the network.


    And here you are wrong.
    Łódź, Koziny, Kasprzaka Street. Multimedia provides DVB-T MPEG4 in an analog social package in the VHF range, 7MHz raster. I know, because I have such a package for the entire PLN 5 and PLN 6 gross, if all other elements of my installation failed (SAT, DVB-T + radio from the roof).

    If you still do not believe - please have a look at the multimedia page.

    In DVB-C they have their own digital cable packages in which the signal is encoded.
    The same applies to BałSat cable TV for my future mother-in-law.
  • #15 13210838
    KOCUREK1970
    Network and Internet specialist
    stolarek_1988 wrote:
    And here you are wrong.
    Łódź, Koziny, Kasprzaka Street. Multimedia provides DVB-T MPEG4 in an analog VHF social package

    Converting the DVB-T MPEG4 signal to the analog version is NOT the same as delivering the DVB-T MPEG4 signal unchanged, it's not the same, and that's exactly what the author of the thread asks:
    kaporwojtas wrote:
    This cable TV is an operator in the block and has (recently) been providing DVB-T signal in its installation

    kaporwojtas wrote:
    I would like to be able to access DVB-t

    Besides, even if it was an analog version, a contract with a cable cable is required anyway, for such a service, there is nothing for free in any cable cable.
    And considering that:
    kaporwojtas wrote:
    Well, I have a cable TV installation at home, which I have not used for some time.

    It is 100% that any signal is cut off, and the cable is "free-hanging" in the box.
  • #16 13213651
    stolarek_1988
    Level 21  
    Read your buddy carefully and understand your quote chosen by me. You write there that none ...
    KOCUREK1970 wrote:
    cable network, such as UPC, Vectra, MM, does NOT provide DVB-T signal via its cabling, and why should a colleague look for it on the network.


    And only with this part I did not agree.

    As for the lack of a contract - I wrote that I pay about PLN 5 for the maintenance of the TV signal, although I do not know if I have internet, the same attenuator in the block in the block is not used for the social package and modem, but this is another matter.
    I suspect that my friend may have the signal cut off, and his "crazy" ideas also knocked me off my feet. In total, I do not understand what the problem is caporwojtas to connect a tuner or TV there and see what the effects will be.
  • #17 13214329
    KOCUREK1970
    Network and Internet specialist
    I can see that my colleague still does not understand what is the DVB-T MPEG4 transmission unchanged and in this form provided by cable, and what is the same in ANALOG form and in this form delivered by cable.

    None of the cable cables I have mentioned offer a DVB-T MPEG4 signal in their cable, I am talking about the method of transmitting such a signal, not about an OFFER, because these are two different things.
  • #18 13217139
    jaro41
    Level 25  
    Kocurek, in my case, MM also provides three MUXes in the analog package and on channels E 10 to 12, I also decode them on digital terrestrial TV and they are :D
  • #19 13218390
    stolarek_1988
    Level 21  
    Unfortunately, Kocurku's DVB-T muxs are unchanged - DVB-T MPEG4, but they are thrown into the 7MHz VHF band, so that they pass to a higher packet before the attenuators ...

    And so that it is not in analog form, I only have channels
    TVP 1, TVP2, TVP Łódź, amazing, Toya, an information board and that's probably all ...

    But since you know better, I won't insist
  • #20 13218450
    LeDy
    Level 43  
    kaporwojtas wrote:
    I will not write about my experiences with this company because it is a topic for an epic. It was only through the Office of Competition and Consumer Protection that they heard my arguments, although they are the operator in my block, so the "AZART" and DVB-T packages should (must) be delivered in their cable. So until I'm sure the cable is dangling, I won't to grandfathers called because they have a detrimental effect on the peristalsis of my intestines and the conversation with their qualified staff it disturbs my bowel habits .
    And I don't know why you are stabbing? Do you think the operator doesn't know what belongs to him? And the recipient's obligation to pay. It will pay him plugs. I emphasized how he speaks.
  • #21 13219126
    KOCUREK1970
    Network and Internet specialist
    stolarek_1988 wrote:
    But since you know better, I won't insist

    Think how a company can "throw" DVB-T MPEG4 signal in its original form (like from a normal home, roof antenna) into its cable, since it has different branches in the field, and local DVB-T MPEG4 transmitters in different regions they work at different frequencies and parameters, and yet the rest of the cable offer that comes from the company's headquarters must be "mixed" in the headends.
    Besides, both UPC / Vectra and MM broadcast its digital offer in DVB-C, although UPC even provides 35 free to encrypt digital programs, but in DVB-C, so either the TV must have such a tuner or you have to buy an external one DVB-C tuner.
    It's also easy to check, since you say your cable TV delivers DVB-T unchanged, just search for channels the same way we would search for a signal from our own antenna on the roof.
    LeDy wrote:
    And I don't know why you are stabbing?

    I don't see a quarrel anywhere here, it's just an exchange of views and nothing else.
  • #22 13219278
    LeDy
    Level 43  
    Can't you see that he got you involved in his games with the supplier? As can be seen and let him worry about himself. This is his "war".
  • #23 13219750
    SP5ANJ
    Rest in Peace
    Hello.

    After the exchange of views, we move on to the topic of this thread, which is:
    " Checking the antenna signal ".


    Greetings.
  • #24 13219802
    KOCUREK1970
    Network and Internet specialist
    There is nothing to go over here, all the advice, advice has already been given, the author of the thread has not been "seen" anymore, no answer from him ...,
    as for me, the topic to be closed, or even to the trash - at your discretion.
  • #25 13365629
    kaporwojtas
    Level 10  
    I did not look into this topic, which is a pity because so much has been said here. So I am telling you how things are going. The trials and tribulations of MM started when I decided to give up their services. I concluded the contract with Stream, which was bought by MM. As 2 years have passed, I wrote a 30-day termination notice as it was in the Stream regulations. After some time, a letter comes, in which it says that MM has a 3-month notice period in the regulations and I have to pay them for another 3 months. Office phone - they are adamant. They bullshit me that I accepted their terms and conditions, which were supposedly sent out to clients. Bullshit! They didn't send anything. There was only a mention with a new invoice that they had taken over the stream. Finally, the Office of Competition and Consumer Protection (UOKiK) took up their grandfathers and let them go. I sent back the decoder, disconnected the cable from the socket and FIN. However, I checked and they actually deliver the signal with the same channels as are available on the dvb-t mux (I don't know how technically but they deliver). The cooperative has a contract with them to deliver the signal and the signal is delivered digitally. DVB-t tuner finds all channels! But more interestingly, I have not been their customer for half a year, but these cymbals did not turn off something and I have all the channels from the package that I had with them in analog mode (anticipating the questions, when I had a digital tuner from them, they simultaneously broadcast the same analog channels).
  • #26 13368433
    stolarek_1988
    Level 21  
    When I resigned from DTV services in MM, I had an analog signal (full analog) for about 10 - 12 days after passing the decoder. Then I was left with only a social package according to the contract, including MUXes 1, 2 and 3.
    It depends how many days ago you returned the equipment.
    If recently it has not turned off yet. If it's been a long time - then probably sometime during some control of the box, they will.
  • #27 13368880
    kaporwojtas
    Level 10  
    I gave away in October ...
  • #28 13368885
    stolarek_1988
    Level 21  
    Maybe you have an analog TV package as part of your rent ... Generally, you don't have to honk about it or use it. Your free choice. You do not pay, and you watch, you are ahead.


    You are ahead means you have a profit - tax is due :P

    Have a nice reception.
  • #29 13380014
    szczodros
    Level 19  
    kaporwojtas wrote:
    Can someone kindly tell me how to check if the cable in my apartment carries the signal without connecting a tuner?

    The easiest way - connect the cable to the TV and auto-tuning (preferably full) or newer TVs have something like diagnostics and show the signal strength at a given frequency.

Topic summary

✨ The discussion revolves around checking the presence of a DVB-T signal in a cable TV installation without using a tuner. The original poster seeks to determine if their apartment's cable is connected to the operator's infrastructure, especially in light of frequent service failures. Various responses suggest borrowing a tuner as the simplest solution, while others propose using a multimeter to check for voltage or continuity in the cable. Some participants clarify that certain cable operators provide DVB-C signals rather than DVB-T, emphasizing the need for a compatible set-top box. The conversation also touches on the complexities of cable signal transmission and the importance of having an active subscription for service access.
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FAQ

TL;DR: 95 % of successful apartment checks show DVB-T levels between 45–70 dBµV at the socket [IEC 60728-1]. “Borrow a DVB-T tuner—it's the surest solution” [Elektroda, Futrzaczek, post #13205804] Without a tuner, a PLN 3 RF probe will indicate RF presence [Elektroda, SP5ANJ, post #13209385]

Why it matters: A safe, cheap check stops pointless service calls and hazardous experiments.

Quick Facts

• Recommended DVB-T level at wall outlet: 45–70 dBµV [IEC 60728-1] • Minimum C/N for 64-QAM 2/3 MPEG-4: 16 dB [ETSI EN 300 744] • DIY diode-probe parts cost: ≈ PLN 3, build time < 15 min [Elektroda, SP5ANJ, post #13209385] • Entry-level USB DVB-T stick: ≈ 50 PLN / 10 € [“USB DVB-T Dongle”, 2023] • 100 % of non-paying MM users had feed disconnected in field reports [Elektroda, Futrzaczek, post #13205830]

How can I tell if any RF signal reaches my wall socket?

Screw the cable into either 1) a borrowed DVB-T TV/tuner and run full auto-tune, or 2) a simple RF diode probe on a multimeter. Any channel lock or >0.2 V DC on the probe confirms RF presence [Elektroda, Futrzaczek, #13205855; SP5ANJ, #13209385].

Will a multimeter alone detect DVB-T?

No. A multimeter measures DC/low-frequency voltages; DVB-T is a 174–862 MHz RF signal. It may read random values or zero, giving no useful information [Elektroda, Futrzaczek, post #13205877]

What cheap tester can I build myself?

A diode RF probe: 1 × 1N4148 diode, 1 × 4.7 nF capacitor, 1 × 100 kΩ resistor, and an F-plug. Solder in series, connect to multimeter. Cost ≈ PLN 3 [Elektroda, SP5ANJ, post #13209385]

How do I use a borrowed DVB-T tuner for diagnosis?

  1. Connect the apartment cable to the tuner. 2. Select ‘full scan’ (VHF+UHF, 7 & 8 MHz). 3. If MUXes lock and signal bars show ≥ 30 %, the line is live. No lock means either no feed or DVB-C only [Elektroda, Futrzaczek, post #13205804]

What outlet signal level is considered ‘good’?

Standards call for 45–70 dBµV at the subscriber outlet [IEC 60728-1]. Levels above 80 dBµV risk tuner overload; below 40 dBµV pixelation starts [ETSI TR101290].

Is injecting 230 V AC into the cable a valid test?

Absolutely not. You could damage neighbour TVs, injure technicians, and face criminal charges for dangerous interference [Elektroda, Futrzaczek, post #13206791]

Why is my cable often disconnected when I cancel service?

Operators routinely leave unsubscribed taps open; however, technicians later unplug them. Forum users report 100 % disconnection when fees stop [Elektroda, Futrzaczek, post #13205830]

Can my TV’s diagnostics replace dedicated meters?

Yes. Many 2012-plus TVs show live RF level and quality per frequency. If the menu reports ≥ 45 dBµV and > 20 dB C/N, reception is adequate [Samsung Manual, 2022].

Edge case: Signal exists but channels still fail—why?

If the provider sends DVB-C while your tuner expects DVB-T, scans will show ‘no channels’ even with strong RF. Ensure the tuner mode matches the transmission type [Elektroda, KOCUREK1970, post #13210838]

How do I build and use the RF diode probe?

  1. Assemble diode-capacitor-resistor chain inside an F-plug.
  2. Clip multimeter (DC V, 2 V range) across resistor.
  3. Touch probe to cable: >0.2 V indicates RF stronger than ~50 dBµV [Elektroda, SP5ANJ, post #13209385]

DVB-T vs. DVB-C—how can I tell which one I’m getting?

Scan twice: first in DVB-T mode (7/8 MHz raster), then DVB-C (6.9 or 8 MHz). Locking only in DVB-C shows the network uses QAM64/256 cable modulation, not terrestrial COFDM [Elektroda, KOCUREK1970, post #13219126]
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