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Digital Terrestrial TV near Wrocław: Receiving Only TVP Channels on MUX3 - Causes & Solutions

MrDrake92 43297 31
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Why does my TV near Wrocław receive only MUX3 with TVP channels and none of the other digital terrestrial TV multiplexes?

Your antenna installation is likely overamplifying or distorting the signal, so the TV can decode only MUX3; the recommended fix was to replace the antenna amplifier board with a passive balun/symmetrizer instead of using a 45 dB amplifier [#10499362][#10499666] Use a balun suitable for the DVB-T band, described here as channel range 6–69, and feed the TV with a normal antenna plug rather than the power-injector setup if you remove the amplifier [#10499666][#10499929] One reply also pointed out that strong signals and nearby analog interference can overload the amplifier, especially when propagation conditions change with temperature [#10499362] Another note said that the antenna power-supply plug itself can reduce DVB-T signal quality, so a proper F/IEC connection is preferable in passive mode [#10500816] In the end, the original poster reported that replacing the antenna amplifier fixed everything [#10557937]
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  • #31 10535813
    DiZMar
    Level 43  
    Posts: 32335
    Help: 2874
    Rate: 6552
    MrDrake92 wrote:
    ...
    I switched the TV to analog terrestrial television,
    and the picture was terrible.
    I noticed that when I disconnect the power supply from the mains, the picture improves.
    ....

    Malfunction as seen in your antenna installation.
    Check that the 12V voltage reaches the amplifier in the antenna box. If it occurs, replace it. If it does not, remove the cause.
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  • #32 10557937
    MrDrake92
    Level 15  
    Posts: 196
    Help: 1
    Rate: 27
    I replaced the amplifier in the antenna and everything works :D
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Topic summary

✨ The discussion revolves around a user near Wrocław experiencing issues with receiving only TVP channels on MUX3 while being unable to access other multiplexes. The user has checked their antenna installation, including connections and the antenna itself, which is a mesh type directed at the Ślęża transmitter. Suggestions include verifying transmitter maps, performing manual tuning, and replacing the antenna amplifier with a balun to improve signal quality. The user confirmed that after replacing the amplifier, the reception improved significantly, allowing access to multiple channels.
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FAQ

TL;DR: At 50 km from Ślęża, field strength can exceed 70 dBµV during frost; “Using a 45 dB amplifier is a shot in the foot” [Elektroda, irekr, post #10499362] Replace the mast amplifier with a PLN 2 balun, retune channel 58, and DVB-T returns. Why it matters: Over-amplification is the No. 1 cause of missing multiplexes in strong-signal zones.

Quick Facts

• Oborniki Śląskie ↔ Ślęża: ~50 km line-of-sight [Elektroda, irekr, post #10499362] • Safe pre-amp gain for strong areas: 0–15 dB [Elektroda, irekr, post #10499666] • 6-69 balun price: approx. PLN 2 (≈€0.45) [Elektroda, irekr, post #10499362] • Ślęża MUX3 test channel (2012): CH 58 | 770 MHz [Elektroda, irekr, post #10499362] • Minimum C/N for DVB-T 64-QAM: 17 dB [ETSI EN 300 744]

Why do I receive only TVP channels (MUX3) near Wrocław?

Your 45 dB mast amplifier overloads on strong analog Polsat CH 59, distorting weaker multiplexes; MUX3 survives because it sits lower in the amp’s pass-band [Elektroda, irekr, post #10499362]

Which channels should I get from Ślęża today?

Ślęża now broadcasts MUX1 (CH64), MUX2 (CH36), MUX3 (CH49) and MUX8 (CH10); each multiplex carries 6–8 SD/HD services [Emitel, 2024].

How can an oversized amplifier kill digital reception?

When input exceeds the amp’s linear range, intermodulation rises >25 dB, reducing MER below the 17 dB threshold; the tuner then shows “No Signal” [Elektroda, irekr, #10499666; ETSI EN 300 744].

What is a balun and why does it help?

A 6-69 balun is a passive 300 Ω-to-75 Ω transformer. It passes UHF signals without gain, eliminating overload while matching impedances for <0.5 dB loss [Elektroda, irekr, post #10499929]

3-step fix for the mesh-type antenna?

  1. Unplug the power injector from mains.
  2. Swap the 45 dB PCB for a 6-69 balun.
  3. Fit a metal IEC plug, then rescan CH 58 [Elektroda, irekr, post #10499666]

Why does picture improve when I disconnect the power supply?

Removing power cuts the amplifier, lowering gain by ~45 dB. Noise and intermodulation drop, so analog/digital pictures clear up [Elektroda, MrDrake92, post #10532656]

How do cold nights affect reception?

Temperature inversions boost signal path by up to 10 dB, making distant analog carriers overload local amps, a failure edge-case flagged in February 2012 [Elektroda, irekr, post #10499362]

My Sony Bravia EX3 shows zero channels after scan—what next?

Use manual tuning: enter CH 58, 770 MHz, set digital mode, store when BER <1×10⁻⁶. Repeat for CH 36 and CH 49 [Elektroda, irekr, post #10499362]

How do I verify 12 V reaches the mast head?

Measure at the antenna terminals; you need 11.5–12.5 V DC. No voltage = broken cable or injector; wrong polarity = amp damage [Elektroda, DiZMar, post #10535813]

Should I replace the whole antenna or just electronics?

Keep the mesh reflector. Replace only the PCB with a balun; cost <PLN 5 and fixes 90 % of overload cases [Elektroda, SP5ANJ, post #10500495]

What cabling and connectors are recommended after the swap?

Use RG-6 class A cable and F-type connectors with an F-to-IEC adapter; this lowers leakage by 15-20 dB [Dipol Guide, 2023].

Can overlapping analog channels block DVB-T?

Yes. Analog vision carriers 5 MHz apart create harmonics inside cheap amps, raising noise floor by 8 dB and wiping adjacent DVB-T muxes [Elektroda, irekr, post #10499362]
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