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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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  • #1 20012091
    wikkto
    Level 6  
    Hello. After changing the standard to DVB T2, I do not receive MUX 1. When manually searching, the strength and quality for MUX 1 is 0. All other MUX's available in my region are available, both strength and quality 100. I live in a block of flats in Poznań, the antenna on the roof, the neighbors say that they receive all programs. What may be the problem?
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  • #4 20012398
    gumisie
    Level 43  
    Which transmitter are you receiving from?

    Missing MUX 1 after update - I don't receive MUX 1 after changing the broadc
  • #5 20012401
    wikkto
    Level 6  
    gumisie wrote:
    Which transmitter are you receiving from?

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


    Poznań Śrem
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  • #6 20012405
    gumisie
    Level 43  
    Collective or individual antenna?
  • #7 20012406
    wikkto
    Level 6  
    gumisie wrote:
    Collective or individual antenna?


    cumulative
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  • #8 20012417
    gumisie
    Level 43  
    @LeDy What do you think?
    For me, it's a bit of a strange situation, since the neighbors pick up this MUX-1.
    Rather, it is not the fault of the TV, since it receives other MUX-2.
  • #9 20012588
    tomaszlonski
    Level 37  
    Philips had updates recently, have you tried to reset the TV after the update? Do not save the list of channels to be played sometimes, only after the reset, scan again.

    In the firmware of this model there are several bugs removed over time, reinstalling the update is recommended only with a reset.
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  • #10 20012605
    wikkto
    Level 6  
    tomaszlonski wrote:
    Philips had updates recently, have you tried to reset the TV after the update? Do not save the list of channels to be played sometimes, only after the reset, scan again.

    In the firmware of this model there are several bugs removed over time, reinstalling the update is recommended only with a reset.


    Unfortunately, it did nothing.

    The TV was installed yesterday, the previous one had the same problem since switching to DVB T2. Could this problem be related to the cable from the TV to the antenna jack? Sorry if this is a stupid question, I'm a layman.
  • #11 20012624
    LeDy
    Level 43  
    You would need a gauge. presence of signal k.29. Try connecting a decoder and see if there is a good signal on this channel.
  • #12 20013593
    irekr
    VIP Meritorious for electroda.pl  
    And before changing the standard, did you receive on another MUX TVP receiver / decoder on k.29?

    From many places there are signals that building managers have not modernized collective installations properly. Neighbors may not necessarily receive from the building's antenna. In addition, MUX1 is on the "new" channel.
  • #13 20013594
    wikkto
    Level 6  
    irekr wrote:
    And before changing the standard, did you receive on another MUX TVP receiver / decoder on k.29?


    Yes, all programs worked before the standard change.
  • #14 20013604
    irekr
    VIP Meritorious for electroda.pl  
    make sure everyone; did you receive programs on k. 29 and 27 or only on one of them.

    MUX5 TVP was broadcast on k.29, now it is on 39.
    MUX4 was broadcast on k.28, now it is on 42, do you receive uncoded "Wydarzenia 24'" Polsat?

    Added after 2 [minutes]:

    The easiest way, as Col. LeDa advises; borrow an external decoder and connect to the antenna cable. Then MANUALLY scan channels.
  • #15 20013614
    wikkto
    Level 6  
    Event 24 never answered
  • #16 20013620
    gumisie
    Level 43  
    wikkto wrote:
    Event 24 never answered
    Not answering right now?
    MUX-4 (leaf 42)?
  • #17 20013621
    wikkto
    Level 6  
    gumisie wrote:
    wikkto wrote:
    Event 24 never answered
    Not answering right now?
    MUX-4 (leaf 42)?


    No, not currently either
  • #18 20013623
    gumisie
    Level 43  
    What exactly are you receiving?
  • #19 20013629
    wikkto
    Level 6  
    gumisie wrote:
    What exactly are you receiving?


    MUX 2, MUX 3, MUX 5, MUX 8
  • #20 20013631
    irekr
    VIP Meritorious for electroda.pl  
    MUX5 on which channel?

    MUX2 is broadcast on the "old" MUX1 channel...
    MUX3 is unchanged and so is MUX8.
  • #21 20013639
    wikkto
    Level 6  
    irekr wrote:
    MUX5 on which channel?

    MUX2 is broadcast on the "old" MUX1 channel...
    MUX3 is unchanged and so is MUX8.


    MUX 5 on 39
  • #22 20013652
    irekr
    VIP Meritorious for electroda.pl  
    That is correct.
    I'm skipping the fact that it's officially called MUX6 now, but that's irrelevant.

    It seems that the collection kit is not adapted to k.29.
    Can you connect this TV to another installation?
  • #23 20013662
    wikkto
    Level 6  
    irekr wrote:
    That is correct.
    I'm skipping the fact that it's officially called MUX6 now, but that's irrelevant.

    I don't have any historical records now - was there ever a broadcast from Śrem on K. 39 or the neighboring ones? This would explain the presence of k.39 in the collection...


    From what I was able to find, MUX 2 was once broadcast from Śrem on k.39
  • #24 20013664
    irekr
    VIP Meritorious for electroda.pl  
    I noticed that too and edited the post. I have before my eyes descriptive plates in RTCN on diplexer sockets. It was a long time ago but I remember...
    Sclerosis.....
  • #25 20013667
    wikkto
    Level 6  
    Generally, it's not the TV's fault because the parents have an identical model and everything that should work works flawlessly
  • #26 20013669
    irekr
    VIP Meritorious for electroda.pl  
    What about the building manager?
  • #27 20013675
    wikkto
    Level 6  
    irekr wrote:
    What about the building manager?


    Generally not much interest, so I'm looking for help elsewhere. The block has been standing for about two years, so they probably think that everything should be fine.
  • Helpful post
    #28 20013679
    irekr
    VIP Meritorious for electroda.pl  
    I would go to them and make a fuss that "Telewizja I'm not working". Tried....

    Another solution is your own antenna outside the window. Which way are you? Any balcony?
    What area is this block located in? As far as possible from Piątkowo....
  • #29 20013682
    wikkto
    Level 6  
    irekr wrote:
    I would go to them and make a fuss that "Telewizja I'm not working". Tried....

    Another solution is your own antenna outside the window. Which way are you? Any balcony?


    I will definitely contact the administrator.

    I have a pretty big east-facing balcony, 1st floor. The vicinity of the Poznań East station, about 6-7 km to Piątkowo.
  • #30 20013683
    gumisie
    Level 43  
    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?
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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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