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TBS6902 - High BER on single MUX #263
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Just to confirm your findings. I'm also using a TBS6902 card with this driver on Fedora 34 with kernel 5.13.6-200.fc34.x86_64. I've been viewing this transponder for a long time with no issues at all. It suddenly went off about 3 weeks ago and subsequent scans fail to find anything at all. I'm in the UK and have good signal to noise. All the other transponders are working fine including the UHD tests on Astra 2F. Because of this I assumed a satellite fault but could find no reports of changes or faults on the web. It seems you've confirmed the transponder is still working on other equipment. I think I have another make of card somewhere so I'll try this in another machine to see if the problem is specific to the TBS6902. I guess it's possible the transponder has a fault and is running on lower power so is only receivable on more sensitive equipment? |
I do not have this card, but I have another one which I think uses the same driver: tas2101 A possible reason for problems is an offset in the local oscillator of the LNB. This makes it more difficult to There can be other reasons for the problem of course, such as interference from other satellites (depending on your location) You could check using my drivers and software: these report the actual frequency tuned to You could also try with the standard drivers tuning 1 Mhz below or above the correct frequency and see if it makes a difference. In general: you will need to capture some kernel driver debug messages, which may involve some experimenting, because |
Just to update: I have tried another box which has an older TBS8922 PCI card connected to the same dish and lnb and it scanned the transponder instantly with good reception on all the channels. Unfortunately when I reverted to the original box with the TBS6902 that too is now working properly again. Nothing has changed in terms of s/n etc so I'm left with no explanation. Until now I haven't been able to find anything on that frequency for a couple of weeks. All the other frequencies have been completely reliable throughout. Just have to see if it fails again and try to dig a bit deeper if it does. |
That is an annoying problem. Other possible cause is a temporary glitch in voltage or diseqc setting. tvheadend has some options to add delays between commands. Things taht could help find the problem when it next occurs |
A day after writing this issue, 11067.5V started working fine for me again. Nothing has changed in the mean time. The weather has improved a bit, but usually that effects everything, not just one mux.
dmesg mentions TBSECP3 ... I don't know 🤷♂️
Currently getting SNR of 11dB (56%) and strength of -45.3dBm (55%). Percentages about the same as before.
So maybe there was some issue with the transponder on the sat. Currently just hoping it keeps working. |
Still working for me. I too am leaning towards a fault but as that particular transponder carries, amongst other things, some important ITV regions I would have expected to find many reports of an outage on the internet. |
I have similar problems with some tuners just not working properly. |
Some things you can check:
I recently had something somewhat similar (some muxes failing to tune, In the past I also had such a problem when an lnb started to fail. This is all speculation, but who knows it could lead to a better diagnosis. |
Just an update to my report: Despite my box being used practically every day (main household TV) this problem has not recurred on either the original 11067.5 or indeed any other Astra 28 frequency. I can only think that in my case at least the original problem was indeed at the satellite end. I've made no changes to the dish, software or hardware in the meantime. As several months have passed I think something would have shown up by now if my problem was with the card or driver. |
thanks. I replaced the LNB nothing got better. |
Bit of a strange bug this, but 11067.5V DVB-S2 on Astra 2G, has been showing a high BER and often fails to lock on.
Other MUXes work fine.
I tried to isolate the problem a little bit, a separate satellite receiver box has no problem with channels on that MUX, so that rules out problems with the cable and LNB. The leaves the TBS6902 card and drivers.
It doesn't happen consistently, at the moment it successfully captures about 1 out of 10 times.
After doing a fresh upgrade and (compile and reboot) earlier this week seemed to fix the problem, but since yesterday it's back to mostly not working again.
I think that these problems started when I updated debian from buster with a 4.19.* kernel, to bullseye with a 5.10.* kernel.
uname -a
:lsb_release -a
:Git details:
linux_media: 910a609
media_build: tbsdtv/media_build@945eea7
Relevant
lspci -vvv
:Output of
femon -H
with mux in question tuned using TVHeadend:One of the slow, but successful captures on 11067.5V:
Switching to a channel on 11225V DVB-S2, tuned within a second:
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