From: thomas schorpp <thomas.schorpp@googlemail.com>
To: linux-media@vger.kernel.org
Subject: Re: dvb-c: TT C-1501: tda827x.c: Cannot hold lock at 746 MHz
Date: Sat, 02 Oct 2010 18:54:46 +0200 [thread overview]
Message-ID: <4CA763D6.4050005@gmail.com> (raw)
In-Reply-To: <4CA74D80.7000707@gmail.com>
Am 02.10.2010 17:19, schrieb thomas schorpp:
> Am 02.10.2010 16:43, schrieb thomas schorpp:
>> 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
>>
>>
>>
>
> 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},
>
Tweaking those parameters doesn't change anything.
Fixed. Bad IEC Connectors. Avoid Philips coaxial cable products or TT Tuner connectors :-/
prev parent reply other threads:[~2010-10-02 16:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-02 14:43 dvb-c: TT C-1501: tda827x.c: Cannot hold lock at 746 MHz thomas schorpp
2010-10-02 15:19 ` thomas schorpp
2010-10-02 16:54 ` thomas schorpp [this message]
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