dvb-c: TT C-1501: tda827x.c: Cannot hold lock at 746 MHz

Hello,

Klaas patch is not complete:
http://article.gmane.org/gmane.linux.drivers.dvb/47571

I found a hole at 746MHz with 2.6.34.0 kernel and DE provider kabelbw.de, Picture fragments and audio bursts only:

Oct 2 15:53:03 tom1 vdr: [16380] receiver on device 1 thread ended (pid=16268, tid=16380) Oct 2 15:53:03 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:03 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:03 tom1 kernel: tda827x: tda8275a AGC2 gain is: 4
Oct 2 15:53:04 tom1 vdr: [16462] setting audio track to 1 (0)
Oct 2 15:53:04 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:04 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:04 tom1 kernel: tda827x: tda8275a AGC2 gain is: 5
Oct 2 15:53:04 tom1 vdr: [16279] frontend 0 lost lock on channel 496, tp 746 Oct 2 15:53:04 tom1 vdr: [16279] frontend 0 regained lock on channel 496, tp 746 Oct 2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:05 tom1 kernel: tda827x: tda8275a AGC2 gain is: 4
Oct 2 15:53:05 tom1 vdr: [16279] frontend 0 lost lock on channel 496, tp 746 Oct 2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:05 tom1 kernel: tda827x: tda8275a AGC2 gain is: 4
Oct 2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:05 tom1 kernel: tda827x: tda8275a AGC2 gain is: 5
Oct 2 15:53:06 tom1 vdr: [16279] frontend 0 regained lock on channel 496, tp 746 Oct 2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:06 tom1 kernel: tda827x: tda8275a AGC2 gain is: 5
Oct 2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:06 tom1 kernel: tda827x: tda8275a AGC2 gain is: 5
Oct 2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:06 tom1 kernel: tda827x: tda8275a AGC2 gain is: 4
Oct 2 15:53:06 tom1 vdr: [16268] switching to channel 494

cycle: 78 d_time: 0.004 s Sig: 51657 SNR: 43690 BER: 1728 UBLK: 55 Stat: 0x00 []
cycle: 79 d_time: 0.004 s Sig: 52428 SNR: 60395 BER: 1728 UBLK: 57 Stat: 0x03 [SIG CARR ]
cycle: 80 d_time: 0.004 s Sig: 50886 SNR: 46517 BER: 1728 UBLK: 95 Stat: 0x00 []
cycle: 81 d_time: 0.007 s Sig: 52428 SNR: 44461 BER: 1728 UBLK: 54 Stat: 0x03 [SIG CARR ]
cycle: 82 d_time: 0.003 s Sig: 51657 SNR: 61423 BER: 1728 UBLK: 5 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 83 d_time: 0.237 s Sig: 40092 SNR: 47288 BER: 1048575 UBLK: 66 Stat: 0x00 []
cycle: 84 d_time: 0.005 s Sig: 56283 SNR: 45232 BER: 1728 UBLK: 113 Stat: 0x00 []
cycle: 85 d_time: 0.006 s Sig: 53199 SNR: 46774 BER: 1728 UBLK: 136 Stat: 0x00 []
cycle: 86 d_time: 0.008 s Sig: 50115 SNR: 44975 BER: 1728 UBLK: 55 Stat: 0x00 []
cycle: 87 d_time: 0.004 s Sig: 53199 SNR: 53970 BER: 1728 UBLK: 287 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 88 d_time: 0.020 s Sig: 50886 SNR: 61166 BER: 1728 UBLK: 62 Stat: 0x03 [SIG CARR ]

Current parameters:
Frequency: 746000.000 kHz
Inversion: ON
Symbol rate: 6.900000 MSym/s
FEC: none
Modulation: QAM 64

Card is just bought newly:

00:06.0 0480: 1131:7146 (rev 01)
Subsystem: 13c2:101a
Flags: bus master, medium devsel, latency 32, IRQ 17 Memory at fbeffc00 (32-bit, non-prefetchable) [size=512] Kernel driver in use: budget_ci dvb

Other (tested favourite) channels are tuned in fine.

No network problems for this transponder reported in cable provider's support forums.

Anyone got the chips datasheet or a hint what to tweak in the tda827xa_dvbc[] for this frequency?

{ .lomax = 802000000, .svco = 2, .spd = 0, .scr = 2, .sbs = 4, .gc3 = 1}, ?

thx,
Y
tom

Am 02.10.2010 16:43, schrieb thomas schorpp:

Quoted 71 lines

Hello,

Klaas patch is not complete:
http://article.gmane.org/gmane.linux.drivers.dvb/47571

I found a hole at 746MHz with 2.6.34.0 kernel and DE provider kabelbw.de, Picture fragments and audio bursts only:

Oct 2 15:53:03 tom1 vdr: [16380] receiver on device 1 thread ended (pid=16268, tid=16380) Oct 2 15:53:03 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:03 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:03 tom1 kernel: tda827x: tda8275a AGC2 gain is: 4
Oct 2 15:53:04 tom1 vdr: [16462] setting audio track to 1 (0)
Oct 2 15:53:04 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:04 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:04 tom1 kernel: tda827x: tda8275a AGC2 gain is: 5
Oct 2 15:53:04 tom1 vdr: [16279] frontend 0 lost lock on channel 496, tp 746 Oct 2 15:53:04 tom1 vdr: [16279] frontend 0 regained lock on channel 496, tp 746 Oct 2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:05 tom1 kernel: tda827x: tda8275a AGC2 gain is: 4
Oct 2 15:53:05 tom1 vdr: [16279] frontend 0 lost lock on channel 496, tp 746 Oct 2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:05 tom1 kernel: tda827x: tda8275a AGC2 gain is: 4
Oct 2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:05 tom1 kernel: tda827x: tda8275a AGC2 gain is: 5
Oct 2 15:53:06 tom1 vdr: [16279] frontend 0 regained lock on channel 496, tp 746 Oct 2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:06 tom1 kernel: tda827x: tda8275a AGC2 gain is: 5
Oct 2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:06 tom1 kernel: tda827x: tda8275a AGC2 gain is: 5
Oct 2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params:
Oct 2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc Oct 2 15:53:06 tom1 kernel: tda827x: tda8275a AGC2 gain is: 4
Oct 2 15:53:06 tom1 vdr: [16268] switching to channel 494

cycle: 78 d_time: 0.004 s Sig: 51657 SNR: 43690 BER: 1728 UBLK: 55 Stat: 0x00 []
cycle: 79 d_time: 0.004 s Sig: 52428 SNR: 60395 BER: 1728 UBLK: 57 Stat: 0x03 [SIG CARR ]
cycle: 80 d_time: 0.004 s Sig: 50886 SNR: 46517 BER: 1728 UBLK: 95 Stat: 0x00 []
cycle: 81 d_time: 0.007 s Sig: 52428 SNR: 44461 BER: 1728 UBLK: 54 Stat: 0x03 [SIG CARR ]
cycle: 82 d_time: 0.003 s Sig: 51657 SNR: 61423 BER: 1728 UBLK: 5 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 83 d_time: 0.237 s Sig: 40092 SNR: 47288 BER: 1048575 UBLK: 66 Stat: 0x00 []
cycle: 84 d_time: 0.005 s Sig: 56283 SNR: 45232 BER: 1728 UBLK: 113 Stat: 0x00 []
cycle: 85 d_time: 0.006 s Sig: 53199 SNR: 46774 BER: 1728 UBLK: 136 Stat: 0x00 []
cycle: 86 d_time: 0.008 s Sig: 50115 SNR: 44975 BER: 1728 UBLK: 55 Stat: 0x00 []
cycle: 87 d_time: 0.004 s Sig: 53199 SNR: 53970 BER: 1728 UBLK: 287 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 88 d_time: 0.020 s Sig: 50886 SNR: 61166 BER: 1728 UBLK: 62 Stat: 0x03 [SIG CARR ]

Current parameters:
Frequency: 746000.000 kHz
Inversion: ON
Symbol rate: 6.900000 MSym/s
FEC: none
Modulation: QAM 64

Card is just bought newly:

00:06.0 0480: 1131:7146 (rev 01)
Subsystem: 13c2:101a
Flags: bus master, medium devsel, latency 32, IRQ 17 Memory at fbeffc00 (32-bit, non-prefetchable) [size=512] Kernel driver in use: budget_ci dvb

Other (tested favourite) channels are tuned in fine.

No network problems for this transponder reported in cable provider's support forums.

Quoted 10 lines

Anyone got the chips datasheet or a hint what to tweak in the tda827xa_dvbc[] for this frequency?

{ .lomax = 802000000, .svco = 2, .spd = 0, .scr = 2, .sbs = 4, .gc3 = 1}, ?

thx,
Y
tom

Hm, this gets complicated, tuning is fine at 722+754MHz but not on 746MHz, this is within the same control segment

{ .lomax = 720000000, .svco = 2, .spd = 0, .scr = 1, .sbs = 4, .gc3 = 1}, { .lomax = 802000000, .svco = 2, .spd = 0, .scr = 2, .sbs = 4, .gc3 = 1},