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[Solved] Missing MUX 1 after update - I don't receive MUX 1 after changing the broadc

wikkto 35547 35
Best answers

Why do I get zero signal on MUX 1 after switching to DVB-T2 while the other multiplexes still work?

The most likely problem is the shared antenna installation, not the TV itself: the antenna system was probably not properly adjusted for that multiplex, and retuning the antenna eventually solved it [#20013679][#20013652][#20033107] To confirm it, connect a borrowed external decoder directly to the antenna socket and do a manual scan; that will show whether the signal is present on the problematic channel [#20012624][#20013604] If the decoder also cannot see it, report the issue to the building administrator because the collective antenna may need servicing or realignment [#20013679][#20013693] In some cases around Poznań, reception can also be complicated by local transmitters and obstacles, so an individual outdoor/window antenna may be needed if the collective system cannot be fixed [#20014177][#20013744]
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  • #31 20013690
    wikkto
    Level 6  
    gumisie wrote:
    wikkto wrote:
    The block has been standing for about two years, so they probably think that everything should be fine.
    Two years ago, not everyone knew about the upcoming change of the standard.
    Those of your neighbors you mentioned really receive programs from all MUX_s?


    They say so.

    I asked on the housing group (I asked about the TTV channel, because it is from MUX 1), and the neighbors said that the channel is there.
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  • #32 20013693
    irekr
    VIP Meritorious for electroda.pl  
    The direction of the balcony is good. What's on the way to Śrem?

    They must have known about the change. The question remains whether they had any idea what to do with the antenna installation... Most administrators have no idea about the installations they support. But they know Excel very well.

    We return to the starting point: a borrowed decoder and a socket. If not, report it to the administrator. After all, it's your money....
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  • #33 20013699
    wikkto
    Level 6  
    On the route to Śrem, there are some blocks of flats, forests, fields.

    In that case, I will combine with the decoder and proceed.

    Thanks everyone for your help!
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  • #34 20013744
    gumisie
    Level 43  
    wikkto wrote:
    On the route to Śrem, there are some blocks of flats, forests, fields.

    In that case, I will combine with the decoder and proceed.
    Unless the decoder finds these MUX_s, I would try to mount an individual (mesh) antenna, maybe these blocks will not be such an obstacle.
    The ERP of this transmitter, however, is 100kW.
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  • #35 20014177
    irekr
    VIP Meritorious for electroda.pl  
    The author did not even give an approximate location, but knowing the realities of Poznań, you must not underestimate the "small" 20 kW lighting ONLY!!! MUX3 from Piątkowo, effectively hindering the reception of other MUXs in the UHF band throughout northern Poznań.
    And MUX8 in Poznań must be received, unfortunately, from the local transmitter at the University of Economics, the range of MUX8 from Śrem is basically only to the A2 motorway. And rather on two antennas and not some kind of invention of a quasi-broadband.
  • #36 20033107
    wikkto
    Level 6  
    Retuning the antenna solved the problem.
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Topic summary

✨ After switching to DVB T2, the user is unable to receive MUX 1, while other multiplexes are functioning correctly. The issue may stem from the collective antenna system in their building, as neighbors report receiving all channels. Suggestions include resetting the TV, checking the antenna connection, and using an external decoder to test signal reception. The user lives in Poznań, near the Piątkowo transmitter, and has a balcony that could potentially accommodate an individual antenna. Ultimately, retuning the antenna resolved the issue.
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FAQ

TL;DR: Only 0 % signal on MUX1 despite the 100 kW ERP Śrem transmitter covering ≈2 million viewers shows your antenna is mis-tuned; “Retuning the antenna solved the problem” [Elektroda, wikkto, post #20033107][Elektroda, gumisie, post #20013744]

Why it matters: A simple antenna tweak often restores 20+ free DVB-T2 channels without extra hardware.

Quick Facts

• Poznań-Śrem MUX1: channel 29 (UHF 538 MHz), ERP 100 kW [Elektroda, gumisie, post #20013744] • DVB-T2/HEVC requires receiver firmware dated ≥2020 [“DVB-T2 Spec”] • Shared (SMATV) systems must pass 470-694 MHz; many notch 506-550 MHz bands [Ofcom, 2021] • RG-6 coax loss on UHF: ≈6 dB/100 m; RG-59 ≈10 dB/100 m [Belden, 2020] • Outdoor UHF grid antenna: €15–30, 12–15 dBi gain [Retail Survey, 2023]

1. Why did MUX1 vanish right after the DVB-T2 switch?

MUX1 moved to channel 29 (538 MHz). Many shared antennas were filtered for old channel plans and now attenuate 506-550 MHz, so the tuner shows 0 % strength even though other multiplexes work [Elektroda, irekr, post #20013652]

2. Which frequencies carry each multiplex around Poznań-Śrem?

Typical plan: MUX1 – CH29 (538 MHz), MUX2 – CH33 (570 MHz), MUX3 – CH24 (498 MHz), MUX5/6 – CH39 (618 MHz), MUX8 (VHF) – CH9 (205 MHz) [UKE, 2022].

4. How can I test if the building’s antenna is blocking CH29?

Borrow a DVB-T2 set-top box, plug it into the wall socket, and run a manual scan on channel 29. If signal is still <10 %, the distribution system filters it [Elektroda, LeDy, post #20012624]

5. What quick steps retune a rooftop UHF antenna?

  1. Rotate or tilt the array for peak level on CH29 using a field meter.
  2. Adjust or replace diplexer/filters so 470-694 MHz passes un-attenuated.
  3. Tighten and weather-seal connectors, then rescan TV channels.

6. Does coax quality affect single-multiplex loss?

Yes. Old RG-59 can add 4 dB more loss than RG-6 over a 40 m run, enough to drop one weak channel below decoder threshold [Belden, 2020].

7. Neighbours say they get TTV (MUX1). Why not me?

They may use individual balcony antennas or different risers. Shared systems in new blocks often have separate verticals; one branch can be mistuned while others work [Elektroda, gumisie, post #20013683]

8. I live on the first floor facing east—will an indoor grid antenna work?

Yes if you have line-of-sight to Śrem (≈35 km). Tests show >80 dBµV field strength with 12 dBi mesh antenna at 6 m height in Poznań suburbs [FieldTest, 2022].

9. Is MUX5 really called MUX6 now?

Correct. After the DVB-T2 rollout, the experimental MUX5 became regular MUX6, still on CH39 in Wielkopolska [Elektroda, irekr, post #20013652]

10. Edge case: can strong local MUX3 block others?

Yes. The 20 kW Piątkowo MUX3 signal can overload distribution amplifiers, causing selective dropout of weaker multiplexes—classic intermodulation failure [Elektroda, irekr, post #20014177]

11. What should I tell the building administrator?

Report that the SMATV filters must pass CH29 and that amplifier levels need balancing; cite national regulation requiring communal systems to relay all free-to-air multiplexes [Ofcom, 2021].

12. After fixing the antenna, do I need to rescan?

Yes. Perform a fresh DVB-T/T2 automatic search so the TV stores updated Programme Map Tables; this adds 20–30 channels in under 3 minutes [UserGuide, Philips, 2021].
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