Strange TV Behavior: No TVP1, TVP2 Signal on DVB-T Receiver - Roof Antenna, 15m Cable Issues?

Question

Hello everyone. I have been struggling with my problem for quite a long time, over half a year, I think. Namely, I have a TV with a built-in DVB-T receiver. 15m cable and antenna on the roof, the so-called mesh. The problem is with the reception of TVP1 and TVP2, the rest of the channels work...

TELMOR_PL · Accepted Answer

Probably for MUX-3 (TVP) there is a colleague within the range of two transmitters - Śrem and lighting Poznań / Piątkowo both on the same channel 27. There may be a problem with the synchronization of both transmitters - one of the signals arrives with a delay and the head switches.

Anonymous · Accepted Answer

I do not exclude what TELMOR_PL says, but .... Due to its age, this model does not impress too much with its parameters. This is an HD Ready TV with a screen working in SVGA resolution (1024x768). I have not found anything concrete about the built-in dvb-t tuner, only that it supports the MPEG-4 standard, and this should in theory be enough for the tuner. However, maybe it is about the decoding of the AV stream itself, which the TV is not able to process on the fly and display it smoothly, hence the problems with interruptions in the picture. Try to update the firmware of this TV, if any new ones are available. Greetings. PS Since it's a Smart TV, you've probably played some movies on it from an SD card or USB flash drive. If you are comfortable with those recorded in Full HD resolution, decoding the signal from the tuner should not be a problem. But the FW upgrade would not hurt in my opinion. EDIT: 1024x786 is XGA

Anonymous · Accepted Answer

But you've noticed that on the new TV connected to this installation, everything was flickering as it should be, so I don't understand your conclusions. Are you sure that everything works on another TV? Take it easy for a little longer and you will see where the problem lies. Or are you writing now about jamming on this new hardware? As it seems to me, the message no signal may refer to the audio-video signal, not the signal received by the dvb-t tuner. As you said yourself on the tuner, strength and quality 10/10. Maybe the tuner itself has a problem with decoding the signal from MUX, or there is a problem somewhere on the way to the screen with the AV codecs and / or the performance of the hardware / processor that processes it.

TELMOR_PL · Accepted Answer

The reticle is a wide-angle antenna with a large field of view, it has a large half power angle. If a location can collect signals from several transmitters at different angles, it will pick up signals from all of them. In this case, the only advice is to replace the antenna with a highly directional (low half-power angle) and direct it precisely at the transmitter from which you want to receive. Since it is lighting on the same channel, the use of a channel filter is not necessary. Choosing a different transmitter as well.

_kli_ · Accepted Answer

Are these parameters for k.27? It's kind of weird. Panasonic TVs have probably one of the best dvb-t tuners. I have an 8-year-old plasma from the X20 series myself and tested it on various signals. Most often with a positive result. Panasonic received steadily when external decoders had hiccups on the same signal. My antenna also receives one channel in SFN from three transmitters (10 km / 30 km / 45 km). And on it I have the worst quality (according to the meter), but Panasonic shows stable 10/10. The real testing ground was the period of dvb-t implementation and the successive incorporation of new transmitters in SFN. A few years ago, when the synchronization broke down, even for a few days on the SFN channel I had the maximum signal strength and quality - 0. When Emitel synchronized the transmitters, the signal suddenly returned to 10/10. Fortunately, this situation has not happened again for several years. My Panasonic is also quite resistant to signal clipping. The reception fading appears only around 105 dBuV (according to the standard it is max. 74 dBuV). A meter with echo measurement is needed to diagnose the problem.

_kli_ · Accepted Answer

With the antenna aimed at Śrem, almost on the same azimuth, you have strong mux-3 illumination (27/20 kW) in Piątkowo in Poznań. So two transmitters transmitting the same at a distance of about 20 and 60 km. The suspicion of a lack of synchronization seems to be justified, but ... Since the no signal message appears, there should be some reaction on the signal bars. Do you have a stable 10/10 all the time? What can you try to do in this situation? First, change the direction of the antenna, the height of its suspension or the place of its installation. When these procedures do not bring a positive result, you can think about the next steps with replacing the antenna or buying a receiver - necessarily with DVB-T2 / HEVC .

TELMOR_PL · Accepted Answer

Before buying anything, I would measure with a suitable DVB-T meter and check the spectrum and spectrum on channel 27 using the current antenna. The measurement should identify disturbances and the result should help you make a purchase decision.

olekt2002 · Answer

Signal distorted. Remove the amplifier and insert a balun in its place. Ev. antenna replacement.

czesteros1986 · Answer

I forgot to add that I have been using a balun for about a year, a friend recommended and installed it.

Vytautas_YT · Answer

Antenna with amplifier or balun? How is the situation on other HD channels?

czesteros1986 · Answer

The balun for about a year.

Anonymous · Answer

Since you have such regular fades, it does not have to be the fault of the antenna installation. If it's some old DVB-T receiver it may not keep up to decode the signal stream in HD image format. I understand that you receive these channels from the nationwide MUX-3? On it TVP-1, TVP-2 and TVP-Info HD broadcast in HD, the other channels are in the SD image format. The same problems on TVP Info HD? According to the information on this website other channels also on other multiplexes are broadcast in SD format.

czesteros1986 · Answer

The same thing happens on TVP info HD. But less often. A mux 3 nationwide.

Vytautas_YT · Answer

MUX-8, a colleague is picking up or not?

czesteros1986 · Answer

Mux8 absolutely. And no problem, zero jam, etc.

Vytautas_YT · Answer

Is it OK on TVP Sport HD?

Anonymous · Answer

If it is perfect on the other channels, and the programs in the SD image format, and only on the channels broadcast in HD format, it is bad, I would suggest replacing the receiver with a newer type. It looks like the antenna installation is fine, but let's not prejudge anything just yet. Check how TVP Sport works if you receive MUX-8 as suggested by my colleague @Vytautas_YT. What kind of TV model would you say to get an idea of the dvb-t tuner parameters?

TELMOR_PL · Answer

Where is this installation located in Poznań?

czesteros1986 · Answer

Built-in dvbt receiver, model; Panasonic txp42x10y Added after 2 [minutes]: It is exactly 25 km north of Poznań.

czesteros1986 · Answer

There is no such problem with the neighbors. For example, on TVP the story is ok. Assuming that there is a problem with timing, any advice to solve it? Does the fact that I have a symmetrizator matter?

czesteros1986 · Answer

I checked this eventuality in the tv options and the info appears that this is the latest version. I connected a second TV to this antenna installation, much newer because it is 2 years old. For 15 minutes, Tvp1 never got stuck ? EDIT. Hmm, I think you need to rule out the option that it's because of HD. Now I look like this and also TVP culture and TVP ordinary sport without HD, it also has such a case, but less often. On TVP 1 and TVP2 it is crazy to get this frequency. Hmm, but why didn't it happen on the second newer tv ? Assuming that there is a problem with timing, is there any advice, solution?

Anonymous · Answer

A newer TV can better decode the signal. Maybe you have a damaged dvb-t tuner in that old one? But for me, the message no signal means no AV signal, not no terrestrial TV signal. I thought you already had the answer. I think you can buy some external dvb-t tuner and the TV set may still be used. Maybe some Ferguson Ariva or WETEK Play?

TELMOR_PL · Answer

The fact that she perceives better at the neighbour's house does not mean anything. Each case is different and requires an individual approach. The neighbor has a different installation - antenna, cables, location, ... and a different receiver. The sensitivity of the heads in the receivers varies greatly.

czesteros1986 · Answer

Now I am more inclined to the fact that it is not the fault of the tuner, but the synchronization of these transmitters. Because I also noticed these clips on TVP Kultury and TVP sport, not the usual HD ones. If so, then what advice, solution?

czesteros1986 · Answer

I apologize when I wrote something incomprehensible ? Everything is flashing on the new TV connected to the same installation, every channel, I tested for 15 minutes. The clips that I noticed also on TVP sport TVP Kultura refer to the old TV, this Panasonic. So you can say that MUX-3 is limp, so there may be a problem with this synchronization, and this old TV and the built-in dvbt decoder do not grasp it, so I will probably look for a new dvbt tuner.

czesteros1986 · Answer

I checked almost all channels, 99% of those terribly persistent glitches I mentioned earlier Tvp1 Tvp2, Tvp info, Tvp culture are on channel 27. Any conclusion? And these parameters 10/10 are for k27

TELMOR_PL · Answer

I think the conclusion has already been made a few posts before. Something is happening on channel 27 - I bet on synchronization, or rather the lack of it.

czesteros1986 · Answer

So what is the best solution? Buy a new external DVBT tuner (considering that everything worked beautifully on a new TV with this installation), or buy a new directional antenna? But will it catch all MUXs from my location with such an antenna? Best regards and thanks to everyone for your help.

czesteros1986 · Answer

I just checked. On those channels where the problem in question occurs, no signal, strength; 10 on the other hand, the quality suddenly drops to 0 and suddenly rises again to 10 ? Generally, thanks, gentlemen, for your help so far. Added after 2 [hours] 17 [minutes]: I was on the roof a moment ago, I connected the cable to another old type antenna (as shown in the picture) great reception, but the problem did not disappear on the MUX-3, the same no signal, black image every 5 seconds.

Strange TV Behavior: No TVP1, TVP2 Signal on DVB-T Receiver - Roof Antenna, 15m Cable Issues?

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