I have a Zgemma H9s decoder from OpenAtv I noticed that on the tracer 114888H275000 3/4 where Eleven sport channels are often cut I checked 2 decoders the same on each one. I entered the antenna settings, the SNR jumps strangely on this transmitter, 72% -45%, it can even at 0spasc per second....

I think about it myself. Previously, I had a Zgemma H.2S and I watched a lot of jams. After connecting the H9S jams also happen. I rather exclude the guilty equipment because I gave the first one to the other person and she confirmed that it works for him. But does owe a converter that's hard for me to say? If the jams were to concern selected channels, I will start to note them down.

There may be interference from LTE, radio internet or anything to do with the radio (in the apartment or outside) - routers, modems, etc ...

Internet interference is just disrupting transponders between 11393-11508.

Anyone had a similar problem? I can move the modem further, but the router must be close to the set-top box too many devices connected

But it's probably the router that sows wifi, so it could potentially be responsible for the interference. Disconnecting the router from the power eliminates interference? If so - the first thing - the SAT cable going to the set-top box - should have the highest possible screening factor .. Is it a cable directly from the SAT antenna or from the RTV socket? If from the socket - made or bought? If it is not a question of the RF cable, then you would have to find a compromise for the location of the equipment or other hard solution to the problem - that is, either change the location of the router (it is possible that just turning it can help) or combine with the location of the decoder, changing the wifi band, etc ..

For a test, move the decoder away from the router, distance the cable to the decoder max. how much you can from the router. They already wrote on the forum that something was done on the air, but they did not associate it with interference.

And is the cable directly from the antenna (without the socket), sticking out of the wall and rolled up a few meters, and it lies next to the decoder and with a tangle of other cables. This may affect the interference? The router is behind the wall, but Zgemma has a wifi access point. It is also worth considering the devices we have connected to the home wifi network. Some WiFi cards, as well as several, may interfere with the work of others and cause such interference as well.

Maybe. If there is already such a supply of cable, it must be uncoiled but loosely thrown in a tangle. But its length does its job anyway and is a long antenna for interference, especially if it is a lower quality cable. Cable type, what is it printed on ?. You should cut the cable, install an RTV socket, and approach the decoder with the shortest possible section of the antenna cable with the greatest possible shielding. Probably not only Zgemma. And some transmitter can sow on the cable most effectively. It's a different story. WiFi transmission protocols take care of these things and try to organize it all to minimize the effects of conflicts between devices / networks.

I have already figured out that the modem connected to the router is causing interference ... It turns out I have to move the router to another place, And let everything go over wi-fi, now I had everything plugged into the cable (tv, zgemma, and PS4) Thanks gentlemen for your help

Zgemma H9s OpenAtv Decoder: Trimming Issues on Eleven Sport Channels - SNR Fluctuations & Fixes

djpablo1980 29901 17

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#1 18510930 04 Mar 2020 20:30

djpablo1980 djpablo1980

Level 4

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Post #1
18510930 04 Mar 2020 20:30

I have a Zgemma H9s decoder from OpenAtv
I noticed that on the tracer 114888H275000 3/4
where Eleven sport channels are often cut
I checked 2 decoders the same on each one.
I entered the antenna settings, the SNR jumps strangely on this transmitter, 72% -45%, it can even at 0spasc per second.
This only happens on this transporter.
All other channels are running smoothly.
Is it the fault of the converter? One antenna, 80 cm. A twin converter, the other cable goes to the neighbor, I know if it matters.

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#2 18511041 04 Mar 2020 21:13

Coronus Coronus

Level 7

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Post #2
18511041 04 Mar 2020 21:13

I think about it myself. Previously, I had a Zgemma H.2S and I watched a lot of jams. After connecting the H9S
jams also happen. I rather exclude the guilty equipment because I gave the first one to the other person and she confirmed that
it works for him. But does owe a converter that's hard for me to say?

If the jams were to concern selected channels, I will start to note them down.
#3 18511287 04 Mar 2020 22:41

Anonymous Anonymous

Level 1

» |

Post #3
18511287 04 Mar 2020 22:41

There may be interference from LTE, radio internet or anything to do with the radio (in the apartment or outside) - routers, modems, etc ...
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#4 18511653 05 Mar 2020 08:49

LeDy LeDy

Level 43

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Post #4
18511653 05 Mar 2020 08:49

Internet interference is just disrupting transponders between 11393-11508.
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#5 18511837 05 Mar 2020 10:38

djpablo1980 djpablo1980

Level 4

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Post #5
18511837 05 Mar 2020 10:38

Anyone had a similar problem?
I can move the modem further, but the router must be close to the set-top box too many devices connected
#6 18512006 05 Mar 2020 12:02

Anonymous Anonymous

Level 1

» |

Post #6
18512006 05 Mar 2020 12:02

But it's probably the router that sows wifi, so it could potentially be responsible for the interference. Disconnecting the router "from the power" eliminates interference?

If so - the first thing - the SAT cable going to the set-top box - should have the highest possible screening factor .. Is it a cable directly from the SAT antenna or from the RTV socket? If from the socket - made or bought?

If it is not a question of the RF cable, then you would have to find a compromise for the location of the equipment or other "hard" solution to the problem - that is, either change the location of the router (it is possible that just turning it can help) or combine with the location of the decoder, changing the wifi band, etc ..
#7 18512156 05 Mar 2020 13:36

LeDy LeDy

Level 43

» | Helpful post? (+1)

Post #7
18512156 05 Mar 2020 13:36

For a test, move the decoder away from the router, distance the cable to the decoder max. how much you can from the router.
They already wrote on the forum that something was done on the air, but they did not associate it with interference.
#8 18513282 05 Mar 2020 22:42

Coronus Coronus

Level 7

» | Helpful post? (+1)

Post #8
18513282 05 Mar 2020 22:42

And is the cable directly from the antenna (without the socket), sticking out of the wall and rolled up a few meters, and it lies next to the decoder and with a tangle of other cables. This may affect the interference?
The router is behind the wall, but Zgemma has a wifi access point.

It is also worth considering the devices we have connected to the home wifi network.
Some WiFi cards, as well as several, may interfere with the work of others and cause such interference as well.
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#9 18513667 06 Mar 2020 09:13

Anonymous Anonymous

Level 1

» |

Post #9
18513667 06 Mar 2020 09:13

Coronus wrote:
And is the cable directly from the antenna (without the socket), sticking out of the wall and rolled up a few meters, and it lies next to the decoder and with a tangle of other cables. This may affect the interference?
Maybe. If there is already such a supply of cable, it must be uncoiled but loosely thrown in a tangle.

But its length does its job anyway and is a long antenna for interference, especially if it is a lower quality cable. Cable type, what is it printed on ?.

You should cut the cable, install an RTV socket, and approach the decoder with the shortest possible section of the antenna cable with the greatest possible shielding.

Coronus wrote:
The router is behind the wall, but Zgemma has a wifi access point.
Probably not only Zgemma. And some transmitter can sow on the cable most effectively.

Coronus wrote:
It is also worth considering the devices that we have connected to the home wifi network.
Some wifi cards, as well as several, may interfere with the work of others and cause such interference.
It's a different story. WiFi transmission protocols take care of these things and try to organize it all to minimize the effects of conflicts between devices / networks.
#10 18514572 06 Mar 2020 17:56

djpablo1980 djpablo1980

Level 4

» | Topic author Helpful post? (0)

Post #10
18514572 06 Mar 2020 17:56

I have already figured out that the modem connected to the router is causing interference ...
It turns out I have to move the router to another place,
And let everything go over wi-fi, now I had everything plugged into the cable (tv, zgemma, and PS4)
Thanks gentlemen for your help
#11 18514591 06 Mar 2020 18:08

Coronus Coronus

Level 7

» | Helpful post? (+3)

Post #11
18514591 06 Mar 2020 18:08

_cheetah_ wrote:
Cable type, what's printed on?

RG6 074M
#12 18515019 06 Mar 2020 21:01

Anonymous Anonymous

Level 1

» |

Post #12
18515019 06 Mar 2020 21:01

Coronus wrote:
RG6 074M
"RG6" is the standard type of television (SAT) cable, kind of like a "sedan" in cars. With such a definition, it is more likely that it is a cable with moderate parameters. "074M" is a yardstick.
#13 18515033 06 Mar 2020 21:04

Coronus Coronus

Level 7

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Post #13
18515033 06 Mar 2020 21:04

_cheetah_ wrote:

Coronus wrote:
RG6 074M
"RG6" is the standard type of television (SAT) cable, kind of like a "sedan" in cars. With such a definition, it is more likely that it is a cable with moderate parameters. "074M" is a yardstick.

What cable do you propose? Because soon I will be exchanging for twin, it will be an opportunity
"sedan"?
And what will "Rolls Royce" be like? [I feel like recording 4K movies to the hard drive]
#14 18515051 06 Mar 2020 21:14

Anonymous Anonymous

Level 1

» |

Post #14
18515051 06 Mar 2020 21:14

Coronus wrote:
What cable do you propose? Because soon I will be exchanging for twin, it will be an opportunity
"sedan"?
And what will "Rolls Royce" be like?
Definitely "Abrams" or "Leopard" ... ;)

Seriously - RG-6 class cable, but with shielding > 90dB and even better > 100dB . For example, Triset-113

When used outside - a cable with an outer PE sheath (black), if the cable is made of AL, it should additionally have a gel protecting against moisture.
#15 18515079 06 Mar 2020 21:27

Coronus Coronus

Level 7

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Post #15
18515079 06 Mar 2020 21:27

I also have this:

CATV - 2018 - 18258 - TFC - CCS / AL - SERIES 59 - 197132 M CPR / CE EuroClassification Eca

Will it be good?

[I have one more but I would have to dig to it]
#16 18515119 06 Mar 2020 21:48

Anonymous Anonymous

Level 1

» |

Post #16
18515119 06 Mar 2020 21:48

Coronus wrote:
CATV - 2018 - 18258 - TFC - CCS / AL - SERIES 59 - 197132 M CPR / CE EuroClassification Eca
This one is not. Good producer, but not the cable, especially for SAT.
#17 18546535 20 Mar 2020 23:36

Coronus Coronus

Level 7

» | Helpful post? (0)

Post #17
18546535 20 Mar 2020 23:36

_cheetah_ wrote:
... about shielding > 90dB and even better > 100dB . For example, Triset-113

Found it on a dipole store. Yes, this is it!

Yes, in my case it was about organizing the bundle of cables and devices, including the cables coming to the tuner.
Thanked for all the advice.
#18 18797940 03 Jul 2020 23:01

Pat_Fal Pat_Fal

Level 1

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Post #18
18797940 03 Jul 2020 23:01

In my case, the Zgemma H9S UHD 4K WiFi was clipping the image on all channels and the fault was caused by the fact that the power supply from the set-top box
too close to the R / SAT / TV flush-mounted connector.
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Topic summary

✨ The discussion revolves around issues experienced with the Zgemma H9S decoder from OpenAtv, specifically regarding SNR fluctuations and channel interruptions on Eleven Sport channels. Users report that the SNR fluctuates significantly, causing disruptions, particularly on the specified transponder. Potential causes identified include interference from nearby WiFi routers and the quality of the SAT cable used. Recommendations include relocating the router, ensuring proper cable shielding, and using high-quality RG-6 cables with adequate shielding to minimize interference. Users also discuss the importance of cable management and the impact of connected devices on performance.

FAQ

TL;DR: Eleven Sports freezes often trace to interference within 11393–11508 MHz; “Internet interference is disrupting transponders 11393–11508.” Move router/modem away, separate SAT leads, use RG‑6 with >90 dB shielding, and retest SNR. [Elektroda, LeDy, post #18511653]

Why it matters: This FAQ helps Zgemma H9S/OpenATV users fix SNR spikes that cut picture on Eleven Sports and nearby transponders.

Quick Facts

Affected window: 11393–11508 MHz hotspots align with internet/LTE interference reports. [Elektroda, LeDy, post #18511653]
Reported Eleven Sports transponder: approx. 11488 H 27500 3/4; SNR swung 72%→45%→0%. [Elektroda, djpablo1980, post #18510930]
Cable spec: RG‑6 with shielding >90 dB, ideally >100 dB; example Triset‑113. [Elektroda, Anonymous, post #18515051]
Diagnostic: Power off router/modem; if clipping stops, relocate gear or change Wi‑Fi band. [Elektroda, Anonymous, post #18512006]
Edge case: Keep the H9S power supply away from the R/SAT/TV wall plate to avoid global clipping. [Elektroda, Pat_Fal, post #18797940]

Why do Eleven Sports freeze on my Zgemma H9S/OpenATV?

Interference in the 11393–11508 MHz range can hammer SNR on those muxes. Users saw cuts exactly there. Nearby LTE, routers, or radio internet can couple into SAT cables and make SNR plunge, causing video drops. Focus on interference mitigation first. [Elektroda, LeDy, post #18511653]

How do I quickly confirm if my router or modem is the cause?

Unplug power from the router and modem. Watch if SNR stabilizes and picture returns. If it improves, relocate the gear, reroute the SAT lead, or switch Wi‑Fi band/channels. Also verify your SAT cable has high shielding. This single test isolates local RF sources fast. [Elektroda, Anonymous, post #18512006]

What SAT cable should I use to reduce interference?

Use RG‑6 with shielding >90 dB; >100 dB is better. “Shielding > 90 dB and even better > 100 dB.” Triset‑113 is a solid example. For outdoor runs, prefer black PE jacket; gel-filled if aluminum. High-screening cable materially lowers LTE and Wi‑Fi ingress on sensitive muxes. [Elektroda, Anonymous, post #18515051]

Does coiling extra SAT cable near the decoder cause problems?

Yes. Coiled excess acts like an antenna for interference and raises noise. Uncoil and lay it loosely, or shorten the run. Install an RTV wall socket and use a short, high‑screening patch to the decoder. As one expert put it, the cable “is a long antenna for interference.” [Elektroda, Anonymous, post #18513667]

Where should I place the decoder and SAT cable relative to the router?

Increase physical separation. Move the decoder away from the router and keep the SAT cable as far as possible from it. Avoid parallel runs with power or network cables. Small re‑routes often tame SNR swings on the 11488 H 27500 3/4 transponder. [Elektroda, LeDy, post #18512156]

My H9S clips on all channels. What unusual cause should I check?

Check the set‑top box power supply placement. If the PSU sits too close to an R/SAT/TV wall plate, it can induce clipping across all channels. Move the PSU away from the plate and retest. This edge-case fix restored stable video for one user. [Elektroda, Pat_Fal, post #18797940]

Will changing the Wi‑Fi band help if I cannot move the router?

It can. If relocation is limited, switch Wi‑Fi to a less congested band or channel. Then recheck SNR and BER on the affected mux. Combine this with high‑screening cable to reduce coupled noise. Always baseline by power‑cycling the router during tests. [Elektroda, Anonymous, post #18512006]

Do Wi‑Fi clients themselves jam satellite reception?

Wi‑Fi protocols coordinate clients to reduce conflicts. However, strong transmitters near poorly screened SAT leads can still inject noise. Keep SAT cables and the decoder away from access points. “WiFi transmission protocols take care of these things,” but cable ingress is separate. [Elektroda, Anonymous, post #18513667]

Should I replace the LNB, dish, or twin cabling first?

Start with interference fixes, not hardware swaps. One user confirmed the real culprit was the modem connected to the router. Relocating the router solved the clipping. Only consider LNB or dish changes after excluding local RF ingress. [Elektroda, djpablo1980, post #18514572]

Which frequencies are most sensitive in these cases?

Reports point to the 11393–11508 MHz range. Interference in this window can cause SNR dips and picture cuts. If your problem channels sit there, focus on shielding, separation, and router/modem placement. [Elektroda, LeDy, post #18511653]

Which exact transponder did people report issues with?

Eleven Sports on approx. 11488 H 27500 3/4. Users saw SNR swing from 72% to 45%, sometimes even 0. That volatility triggered image stutter and drops while other muxes ran fine. [Elektroda, djpablo1980, post #18510930]

How do I stabilise SNR fast? (3-step How-To)

Unplug the router/modem and check if SNR stabilizes on the affected mux.
Use a high‑screening RG‑6 lead and verify direct, quality terminations.
If improved, relocate the router/decoder or change the Wi‑Fi band, then retest. [Elektroda, Anonymous, post #18512006]

Is Series 59 CATV cable OK for satellite feeds?

Avoid Series 59 CATV coax for SAT. One user asked about TFC Series 59 CCS/AL and got a clear no. Choose high‑screening RG‑6 instead for proper SAT performance and ingress resistance. [Elektroda, Anonymous, post #18515119]

Does swapping the decoder model fix the jamming?

Unlikely. A user moved from Zgemma H.2S to H9S and still saw jams. That points to environment or cabling, not decoder hardware. Investigate interference and shielding before changing receivers. [Elektroda, Coronus, post #18511041]

Will tidying the cable bundle really help SNR?

Yes. Re‑organizing cables and devices, and improving the lead to the tuner, resolved the issue for one user. After cleanup and a better cable choice, stability returned. This complements router relocation and shielding upgrades. [Elektroda, Coronus, post #18546535]