DVB-T: MUX 2 Issues with RTCN Poznań Śrem Signal - Antenna TELKOM-TELMOR, Possible Interference?

Question

My problem is with MUX-2. I am receiving a signal from RTCN Poznań Śrem. I live within 5 km. Antenna: TELKOM-TELMOR. All other MUXs work fine. On the other hand, periodically on MUX-2 (TVN, Polsat, etc.) the program can not be received. It hangs up, breaks. Mostly in the evening. Sometimes the...

Włodzimierz Wojtiuk · Answer

more specifically? ie what exactly and how placed?

dyspozytor · Answer

Passive terrestrial TV antenna Telmor DIGIT Passive
- Full HD
- UHF (channels 21 to 69).
- Uniform signal amplification in the whole frequency range
- Profit / effectiveness - 4 dB
- Strong attenuation of GSM signals thanks to the appropriate shaped characteristics.
- Good fit (WFS pound: 2.2).
- Discrimination of back radiation
I have so much in the description of the antenna
Antenna in a horizontal position, just like on a photo. It hangs on the 4th floor.

Włodzimierz Wojtiuk · Answer

I understand that he sees the transmitter?

andpol 33 · Answer

In the place where the antenna is hanging, the signal is insufficient.

Włodzimierz Wojtiuk · Answer

Are you sure? Really? because in my opinion it can be too big . At the time when the reception gets worse let the author of the thread check his strength and signal quality on the tuner (of course on the right channel).

andpol 33 · Answer

I'm not sure because I was not there. The fact that it is 5km to the transmitter does not testify to anything? It is enough to build buildings. I have such a case even in the family. Skyscraper 5th floor, to the transmitter can also from 5 km. From the kitchen side, a beautiful view of the EC4 chimney and from the side of the living room where there is no stable picture antenna. Of course, the apartment after renovation and there is no chance to drag the cable from the kitchen. I do not know from where such a view that like 5km must already receive it.

_kli_ · Answer

They receive mux-y on low channels 23 and 27, no reception on k.39. It looks like a weak signal.
So the questions remain

Włodzimierz Wojtiuk wrote:
how placed?

Włodzimierz Wojtiuk wrote:
"sees" the transmitter?

Is it mounted outside? What cable and what length? Are the connectors correctly made?

dyspozytor · Answer

The antenna sees the transmitter. However, the signal goes along the block. And so I think, is there any interference from neighbors? Cable about 1.5 m. Installation repeatedly checked.

SNR - 22.2 dB to 26.1 dB
Signal strength -76,0 dBm to -78 dBm

At the moment there are such results and the reception is excellent. Unfortunately, I can not give other data, because now everything is ok :-)

Włodzimierz Wojtiuk · Answer

Where did I write that he must receive? If the level is too high, it will also be k..a, and the idea that it is too big only because the Author / Reporter does not report any problems with the rest of the MUX channels / problems ... (I have very different {reception in direct visibility of 2 km, 4 km, and shadow for the scar 30 km} experience from the analogue TV period about the transmitter in Chotycze) Let us wait for the author to speak. Added after 5 [minutes]: It's already a lot (as far as I remember the recommended levels) Well, we are waiting for corruption and results. I'm sorry because I've been buried too much by other units!

dyspozytor · Answer

On MUX-3 TVP-1 and here it is always ok. SNR-33.1 dB Signal strength 48.0 dBm It looks like the power is much lower, and it's always ok.

andpol 33 · Answer

Small force and small SNR. link

dyspozytor · Answer

On MUX-3 (TVP-1, TVP-2) and here it is always ok.
SNR-33.1 dB
Signal strength 48.0 dBm

However, on MUX-2 (TVN, Polsat, etc.) these are the results now, when everything is OK. I do not know for how long :-)

SNR - 22.2 dB to 26.1 dB
Signal strength -76,0 dBm to -78 dBm

_kli_ · Answer

Feebly. A head with very good sensitivity if it is still receiving something. It is only about 31-33 dBuV, with the minimum required 45-47 dBuV (-64 / -62 dBm). Hence, good reception (-48 dBm = 61 dBuV). It would be better if it was ? 30 dB - just like you have on mux-3.

Włodzimierz Wojtiuk · Answer

Thank you! I was too much caught in the ganglia of other units from the time of cable TV (dBuV) I apologize to everyone for confusion!

dyspozytor · Answer

MUX-1
32.9 dB
49.0 dBm

MUX-2
24.1 dB
77.1 dBm

MUX-3
33.1 dB
48.0 dBm

MUX-8
33.0 dB
52.0 dBm

Does this mean that the antenna is weak? Why is it that only the MUX-2 receives so little? Is there any possibility of healing this situation? What can you do in this situation?

andpol 33 · Answer

You will not do anything with this antenna. I would suggest you buy an antenna with an openable standard can, so that you can replace the balancer with an amplifier, e.g. link .
Or ask kol @ Telmor if they have amplifiers for your antenna on sale.

_kli_ · Answer

Well, sometimes it happens that one mux sticks out from the others. Start with a slight change of direction. Often a small shift of the antenna vertically or horizontally causes a dramatic improvement. Experiment by observing mux-2 parameters. It may also be that it will improve and the remaining mux deteriorate.

dyspozytor · Answer

Ok. I will try the easiest way. From changing the antenna setting. I will try tomorrow morning.
For now, Colleagues, thank you.

Added after 18 [hours] 56 [minutes]:

I set the antenna so that the results are optimal (averaged in individual MUX). For now it's ok. The reception is great. We'll see what will happen. Thank you Kolegom once again for helpful comments.

DVB-T: MUX 2 Issues with RTCN Poznań Śrem Signal - Antenna TELKOM-TELMOR, Possible Interference?

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