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6903X Problem Tuning

6903X Problem Tuning

Postby bardoc » Thu Oct 27, 2022 3:26 pm

Hello, everybody!
I have a problem tuning TBS6903X in Linux.
If I first tune the card to a DVBS2 transponder, then it doesn't tune to DVBS until rebooting the computer.

I am using the latest drivers from:
git clone --depth=1 https://github.com/tbsdtv/linux_media.git -b latest ./media
bardoc
 
Posts: 10
Joined: Wed May 24, 2017 3:30 pm

Re: 6903X Problem Tuning

Postby smile » Mon Oct 31, 2022 10:28 am

Hi sir
what is the application and search parameters you used?
Could you show me that?

Best regards
smile
 
Posts: 148
Joined: Sun Oct 09, 2011 9:51 am

Re: 6903X Problem Tuning

Postby bardoc » Mon Oct 31, 2022 6:17 pm

Hello 'smile', thnx for your reply!
That's the example of my code tuning the 6903X card by steps.
(https://github.com/tbsdtv/media_build/t ... ra/tune-s2)

1) I try to tune the card to some DVB-S2 signal. Result - the signal is locked.
2) After that I try to tune the card to some DVB-S signal. Result - the signal is not locked even after 20 sec waiting.
3) I reboot the tbsecp3 driver (or restart the computer).
4) I try to tune the card to the same DVB-S signal as in step 2. Result - the card is immediately successfully tuned to the DVB-S signal.

1)
Code: Select All Code
>./tune-s2 1804 V 30000 -lnb IF -system DVB-S2 -modulation 8PSK
LNB: low: 0 high: 0 switch: 0
opening: /dev/dvb/adapter0/frontend0
frontend: (TurboSight TBS 6903x (Dual DVB-S/S2/S2X))
fmin 950 MHz
fmax 2150 MHz
min_sr 100 Ksps
max_sr 520000 Ksps
LOW band

Tuned specs:
System:     DVB-S2 6
Frequency:  1804 V 30000
22khz:      OFF
Modulation: 8PSK 9
FEC:        3/4 3
Inversion:  ON 1
Rolloff:    25 2
Pilot:      ON 1
MIS:        -1
Bandwidth:  37.5000 MHz
Data Rate:  66.1500 Mbps
CN Failure: 7.9 dB

status Locked | signal -55.9 dBm | snr 14.6 dB | ber 0 | FE_HAS_LOCK


2)
Code: Select All Code
>./tune-s2 1727 V 27999 -lnb IF -system DVB-S -modulation QPSK
LNB: low: 0 high: 0 switch: 0
opening: /dev/dvb/adapter0/frontend0
frontend: (TurboSight TBS 6903x (Dual DVB-S/S2/S2X))
fmin 950 MHz
fmax 2150 MHz
min_sr 100 Ksps
max_sr 520000 Ksps
LOW band

Tuned specs:
System:     DVB-S 5
Frequency:  1727 V 27999
22khz:      OFF
Modulation: QPSK 0
FEC:        AUTO 9
Inversion:  AUTO 2
Rolloff:    AUTO 3
Pilot:      ON 2
MIS:        -1
Bandwidth:  27.9990 MHz
Data Rate:  -nan Mbps
status Unlocked | signal -44.6 dBm | snr 0.0 dB | ber 0 |


3)
Code: Select All Code
>sudo rmmod tbsecp3 stid135                                   
>sudo modprobe tbsecp3


4)
Code: Select All Code
>./tune-s2 1727 V 27999 -lnb IF -system DVB-S -modulation QPSK
LNB: low: 0 high: 0 switch: 0
opening: /dev/dvb/adapter0/frontend0
frontend: (TurboSight TBS 6903x (Dual DVB-S/S2/S2X))
fmin 950 MHz
fmax 2150 MHz
min_sr 100 Ksps
max_sr 520000 Ksps
LOW band

Tuned specs:
System:     DVB-S 5
Frequency:  1727 V 27999
22khz:      OFF
Modulation: QPSK 0
FEC:        7/8 7
Inversion:  ON 1
Rolloff:    35 0
Pilot:      ON 2
MIS:        -1
Bandwidth:  37.7987 MHz
Data Rate:  45.1553 Mbps
CN Failure: 7.2 dB

status Locked | signal -55.8 dBm | snr 15.7 dB | ber 0 | FE_HAS_LOCK
bardoc
 
Posts: 10
Joined: Wed May 24, 2017 3:30 pm

Re: 6903X Problem Tuning

Postby smile » Thu Nov 03, 2022 3:00 pm

Could you try the dvblast?
dvbs :dvblast -f 172700 -s 27999000 -v 13 -5 dvbs -a 0
dvbs2 : dvblast -f 1804000 -s 30000000 -v 13 -m psk_8 -5 dvbs2 -a 0

Best Regards
smile
 
Posts: 148
Joined: Sun Oct 09, 2011 9:51 am


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