Dear tvheadend experts,
I have a Geniatech MyGica T230C usb DVB-T/T2/C tuner stick and it works well on windows 7 x64, I can watch both dvb-t and dvb-c channels. With an android tablet using the padtv hd app I can watch dvb-t channels.
On linux ( latest Ubuntu with kernel 5.x ) I can only watch dvb-t channels.
The stick can tune the dvb-c channels but when selected a channel to watch there is no video or audio. There are some audio noises and sometimes some pictures with color rectangles but it seems not working. What can be the problem? Can be the signal level too high?
On the tvheadend config tab I can see the LNA checkbox only for dvb-t but not for dvb-c. Why?
Does the windows driver or the windows tv player application switch off the LNA (preamp) or sets a different (lower) amp rate to get things working? I suppose the windows driver contains the same fw like these in linux (see the log msg below).
thanks for any info
Daniel
Tvheadend 4.2.9
Linux: 5.3.0-46-generic (Ubuntu 19.10 64bit, Intel Core i3-6100, Intel HD graphics 530)
driver: dvb_usb_dvbsky
fw: dvb-demod-si2168-d60-01.fw version: D 6.0.2
fw: dvb-tuner-si2141-a10-01.fw version: 1.1.10
modinfo si2168 :
filename: /lib/modules/5.3.0-46-generic/kernel/drivers/media/dvb-frontends/si2168.ko
descr: Silicon Labs Si2168 DVB-T/T2/C demodulator driver
a channel tried for example:
590 0000 kHz bandwidth 8
6900 bauds
256-qam
channel scan in Kaffeine:
signal about 82.80 dBuV
SNR between 32 and 36.50 dB
perfect reception with dvb-t :
dvb-fe-tool --femon
signal= -52,00 .. -53,00 dBm C/N= 23,00 .. 24,00dB
no picture, no sound with dvb-c :
signal= -34,00dBm C/N= 37,50dB