DVB-T2 ZDF Mux in Leipzig/Germany at 482MHz not working

Tobias Weiß

Hello,

I use DVB-T2 with tvheadend server on my Raspberry Pi3 B (Kodi 18 - libreelec 9.2.6). I got all public channels working but ZDF, 3Sat and arte. These non-working channnels are all in the Mux 482MHz. Only sometimes they are without disturbance. In one seldom moment I got working them, when I changed the time zone to UTC+1. But the success was only short.

I wrote the local operater of the antenna in Leipzig/Germany. He is from channel MDR and he sent me the following parameter for this mux:

UHF-Kanal: 22
Frequenz: 482 MHz
ERP: 50 kW
Modulation: 64--QAM
COFDM—Modus: 16k--ext.
Fehlerschutz: 3/5
Guard—Intervall: 19/128

Datenrate: 22,0 Mbit/s

To be honest, I don't think that the error is in the software, because the other muxes work. Is it possible that there is an error to the configuration of the antenna? In the configuration of tvheadend there isn't an option for "Fehlerschutz 3/5" I think.

What is the error? I have all the paramter on "auto", as pre-installed for german channel search.

Please could you help me?

Kind regards,
Tobias

Saen Acro

Except frequency leave all to AUTO

Tobias Weiß

Dear Sean,

I had all entries on AUTO but the bandwidth. Now I tried to set the bandwidth

on AUTO too and started the scan. But the new scan ended with failure.

Tobias

Tobias Weiß

Hallo Everybody,

I buyed a Raspberry Pi 4. With Libreelec, Hardware Decoding works with this device. So there is no overheat. But still, the ZDF Transponder at 482 MHz including the channels ZDF, ZDIinfo, ZDFneo and 3Sat does not work. This takes now half a year, so it can't be a temporary distortion of the antenna.

In two weeks, there are soccer european champinships. Could you please Help?

Tobias

Flole

What are you using as Tuner? A USB one?

It's hard to help without having the hardware and actually trying around with it, since the switch to DVB-T2 I never got a DVB-T2 Tuner again as I think it's not worth the money. You can try if w_scan works, then you at least know if it's a Tvheadend issue or not.

Tobias Weiß

It's a Haupage WinTV soloHD.

what w_scan command exactly. I can try w_scan on my Linux Laptop.

I will try Kaffeine first.

Tobias Weiß

OK, on my Laptop Kaffeine doesn't find any channel. I think there is a driver Problem on my Laptop.

But how can I use w_scan on my Raspberry?

Tobias Weiß

On my Laptop I solved the driver problem wth this:

https://www.hauppauge.de/site/support/support_faq.php?n=FAQ.Linux

Now, the channel search with kaffeine works. Also the regarded channels ZDF, ZDFinfo, ZDFneo and 3Sat are without distortions.

It was a good idea, to test it with other software!!! I thought the antenna of the Broadcaster has errors.

And now?

Flole

I don't really understand what you've done now. Simply updated the firmware? Then do the same thing on the raspberry.

Tobias Weiß

On my Raspberry it's not a problem of the firmware. The other muxes work: ARD, MDR, Phoenix and so on.

Tobias Weiß

There is a difference in the search:

Raspberry de-all
Laptop: de-Saxony

Flole

You might still be running an outdated Firmware. Update it so that is ruled out. If it still doesn't work then you should try with w_scan (stop Tvheadend, run w_scan and see if it finds the channels).

Tobias Weiß

On Raspberry ZDF is found, but it is distorted.

Tobias Weiß

OK, I will update the firmware on Raspberry and start a new channel search. This will take a bit time ...

Tobias Weiß

Thats interesting! The firmware file is dvb-demod-si2168-b40-01.fw .

In the order/lib/firmware/ there are links to the firmware files in/usr/lib/kernel-overlays/base/lib/firmware/ .

The only thing is, that there is no link to the existing file/usr/lib/kernel-overlays/base/lib/firmware/dvb-demod-si2168-b40-01.fw

So I did the following:

LibreELEC:/var/lib/firmware # ln -s /usr/lib/kernel-overlays/base/lib/firmware/dvb-demod-si2168-b40-01.fw /lib/firmware/dvb-demod-si2168-b40-01.fw

Now I will see if it works now ...

Tobias Weiß

After making this link and starting a new channels search, all channels are distorted.

I can't replace the the file in/usr/lib/kernel-overlays/base/lib/firmware/ , because it is a read-only filesystem.

I have to see, how I can change this ...

Tobias Weiß

For updating the firmware file, I have to remount "something", but I don't know what "something" is, in this case:

mount -o remount,rw /something

LibreELEC:~ # ls -al /
total 17
drwxrwxr-x 13 root root 202 May 27 2021 .
drwxrwxr-x 13 root root 202 May 27 2021 ..
lrwxrwxrwx 1 root root 8 May 27 2021 bin -> /usr/bin
drwxr-xr-x 17 root root 4120 Apr 11 18:28 dev
drwxrwxr-x 22 root root 1024 May 27 2021 etc
drwxr-xr-x 3 root root 16384 Jan 1 1970 flash
lrwxrwxrwx 1 root root 8 May 27 2021 lib -> /usr/lib
lrwxrwxrwx 1 root root 10 May 27 2021 media -> /var/media
drwxrwxr-x 3 root root 25 May 27 2021 opt
dr-xr-xr-x 128 root root 0 Jan 1 1970 proc
drwxr-xr-x 17 root root 540 Apr 11 18:28 run
lrwxrwxrwx 1 root root 9 May 27 2021 sbin -> /usr/sbin
drwxr-xr-x 16 root root 1024 Apr 11 18:34 storage
dr-xr-xr-x 12 root root 0 Jan 1 1970 sys
drwxrwxrwt 9 root root 180 Apr 11 18:29 tmp
drwxrwxr-x 9 root root 136 May 27 2021 usr

drwxr-xr-x 9 root root 220 Apr 11 18:28 var

LibreELEC:~ # df
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 1740988 4 1740984 0% /dev
/dev/mmcblk0p1 524008 147928 376080 28% /flash
/dev/loop0 135168 135168 0 100% /
/dev/mmcblk0p2 14550493 546533 13999864 4% /storage
tmpfs 1875132 0 1875132 0% /dev/shm
tmpfs 1875132 6904 1868228 0% /run
tmpfs 1875132 0 1875132 0% /sys/fs/cgroup
tmpfs 1875132 16 1875116 0% /var
tmpfs 1875132 0 1875132 0% /tmp

/dev/sda1 479668992 93182156 385493684 19% /var/media/TOSHIBA EXT

Should I delete the symbolic link?

Tobias

Tobias Weiß

I will try with remount root / - I remember I also did some time ago ..

Tobias Weiß

remounting / , /flash and /storage didn't change that I can't replace the firmware file, because of "read-only" filesystem

Flole

If / is on an read-only filesystem like cdromfs or squashfs you can't remount it as read/write.