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[linux-dvb] Re: Budget DVB-C tuning problems
Hmm... Intresting...
Your problem looks like the same problem I am having.
I too got a dvb-c card from usa-x with ves1820, my card is a full dvb card
with mpeg decoder and tvout.
There must be some problem with the drivers because the windows drivers
works perfectly on all channels.
I've been suspecting the frequency too.
Does your card get realy hot too?
Is it normal for dvb-c cards to get hot?
> -----Original Message-----
> From: linux-dvb-bounce@linuxtv.org
> [mailto:linux-dvb-bounce@linuxtv.org] On Behalf Of Antti Kaihola
> Sent: Saturday, February 07, 2004 11:35 AM
> To: linux-dvb@linuxtv.org
> Subject: [linux-dvb] Budget DVB-C tuning problems
>
> I'm having tuning problems on my budget DVB-C card. When I get a good
> tuning, everything works perfectly. Unfortunately I get occasional
> tuning failures all the time.
>
> I've tried tuning with czap, dvbtune and mythtv, and they all show the
> same behavior (see below).
>
> My card is a VES1820-based Technotrend budget DVB-C with Philips
> SAA7146, bought from USA-X / DVBSHOP.
>
> I'm using dvb-kernel from CVS (2004-02-06) with
> kernel-tmb-2.6.2-0.rc2.1.tmb.2mdk-1-1mdk from Mandrake Cooker
> contributions. I did a "make" in the dvb-kernel CVS tree, unloaded
> any DVB modules and loaded these new modules with a modified
> insmod.sh:
> videodev, evdev, v4l1-compat, v4l2-common, video-buf,
> dvb-core.ko, ves1820.ko verbose=1, saa7146.ko, ttpci-eeprom.ko,
> budget-core.ko, budget.ko
>
> I had a similar behavior with the dvb-kernel drivers included in
> kernels 2.4.22, 2.6.0, 2.6.1 and 2.6.2. It seems to me that the
> number of unsuccessful tunings is bigger with the current CVS driver
> than with the older ones.
>
> I've understood that the pwm setting has no effect on this card.
> Trying different values for it when loading the ves1820 module has
> indeed no effect at all to the AFC value (I get (3) always).
>
> The unscrambled channels here (Turku, Finland) are on the frequencies
> 162MHz and 154MHz, so these are the frequencies I've been trying to
> tune to.
>
> One detail which has caught my eye is from the dvbtune output. When I
> tune successfully to, say, 162MHz, dvbtune reads back from the card a
> frequency value of 172579786Hz (see dvbtune output attached below),
> which equals to:
> 162MHz + 10.6MHz - 20214Hz.
> I understand that 20214Hz corresponds to my AFC value of 3, but where
> does the 10.6MHz offset come from?
>
> I've spent a fair amount of time reading this mailing list and found
> no solutions to this problem. I'd appreciate any suggestions about
> how to debug and try to solve the problem.
>
> Best regards,
>
> Antti Kaihola
>
>
>
> Output from lspci
> -----------------
>
> $ lspci -v
>
> 00:0d.0 Multimedia controller: Philips Semiconductors SAA7146 (rev 01)
> Subsystem: Technotrend Systemtechnik GmbH: Unknown device 1004
> [snip]
>
> $ lspci -vvnx
>
> 00:0d.0 Class 0480: 1131:7146 (rev 01)
> Subsystem: 13c2:1004
> Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV-
> VGASnoop- ParErr-
> Stepping- SERR- FastB2B-
> Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
> <TAbort- <MAbort- >SERR- <PERR-
> Latency: 32 (3750ns min, 9500ns max)
> Interrupt: pin A routed to IRQ 17
> Region 0: Memory at cfffbe00 (32-bit, non-prefetchable)
> [size=512]
> 00: 31 11 46 71 06 00 80 02 01 00 80 04 00 20 00 00
> 10: 00 be ff cf 00 00 00 00 00 00 00 00 00 00 00 00
> 20: 00 00 00 00 00 00 00 00 00 00 00 00 c2 13 04 10
> 30: 00 00 00 00 00 00 00 00 00 00 00 00 0a 01 0f 26
>
>
>
> Output from czap
> ----------------
>
> An unsuccessful attempt:
>
> # czap -n 1
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> 1 YLE1:162000000:INVERSION_OFF:6900000:FRC_NONE:QAM_128:512:650
> 1 YLE1: f 162000000, s 6900000, i 0, fec -1, qam 4, v 0x200, a 0x28a
> status 00 | signal e7e7 | snr 8f8f | ber 000001a4 | unc 00000000 |
> status 00 | signal ffff | snr c0c0 | ber 000001a4 | unc ffffffff |
> status 00 | signal ffff | snr bebe | ber 009ffff6 | unc ffffffff |
> status 00 | signal ffff | snr bcbc | ber 009ffff6 | unc ffffffff |
> status 00 | signal ffff | snr bcbc | ber 009ffff6 | unc ffffffff |
> status 00 | signal ffff | snr baba | ber 009ffff6 | unc ffffffff |
>
> Tuning success:
>
> # /tmp/linuxtv-dvb-apps-1.1.0/util/szap/czap -n 1
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> 1 YLE1:162000000:INVERSION_OFF:6900000:FRC_NONE:QAM_128:512:650
> 1 YLE1: f 162000000, s 6900000, i 0, fec -1, qam 4, v 0x200, a 0x28a
> status 1f | signal 9b9b | snr e3e3 | ber 009ffff6 | unc ffffffff |
> FE_HAS_LOCK
> status 1f | signal ffff | snr eded | ber 009ffff6 | unc 00000000 |
> FE_HAS_LOCK
> status 1f | signal ffff | snr eded | ber 00077b82 | unc 00000000 |
> FE_HAS_LOCK
>
>
>
> Output from dvbtune
> -------------------
>
> An unsuccessful attempt:
>
> # dvbtune -f 162000000 -s 6900 -qam 128 -I 0
> Using DVB card "VES1820 based DVB-C frontend"
> tuning DVB-C to 162000000, srate=6900000
> frequency 162000000 inversion 0
> symbol_rate 6900000 fec_inner 9 modulation 4
> polling....
> Getting frontend event
> FE_STATUS: FE_TIMEDOUT
> Not able to lock to the signal on the given frequency
>
> Tuning success:
>
> # dvbtune -f 162000000 -s 6900 -qam 128 -I 0
> Using DVB card "VES1820 based DVB-C frontend"
> tuning DVB-C to 162000000, srate=6900000
> frequency 162000000 inversion 0
> symbol_rate 6900000 fec_inner 9 modulation 4
> polling....
> Getting frontend event
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI
> FE_HAS_SYNC
> Event: Frequency: 172579786
> SymbolRate: 6900000
> FEC_inner: 0
>
> Bit error rate: 983670
> Signal strength: 65535
> SNR: 61166
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI
> FE_HAS_SYNC
>
>
>
> Output from ves1820 verbose=1
> -----------------------------
>
> This is the entry I get in /var/log/messages on a successful
> tuning. The AFC value is occasionally 2, but almost always 3.
>
> Feb 7 10:27:49 localhost kernel: DVB: VES1820(0): AFC (3) -20214Hz
>
>
>
> System log messages when modules are loaded
> -------------------------------------------
>
> Feb 7 11:01:45 localhost kernel: saa7146: register extension 'budget
> dvb'.
> Feb 7 11:01:45 localhost kernel: saa7146: found saa7146 @ mem
> e0945e00 (revision 1, irq 17) (0x13c2,0x1004).
> Feb 7 11:01:45 localhost kernel: DVB: registering new adapter
> (TT-Budget/WinTV-NOVA-C PCI).
> Feb 7 11:01:45 localhost kernel: DVB: VES1820(0): setup for tuner
> sp5659c
> Feb 7 11:01:45 localhost kernel: DVB: VES1820(0): pwm=0x48
> Feb 7 11:01:45 localhost kernel: DVB: registering frontend 0:0
> (VES1820 based DVB-C frontend)...
> Feb 7 11:01:45 localhost kernel: TT-Budget/WinTV-NOVA-C PCI adapter
> 0 has MAC addr = 00:d0:5c:02:57:16
>
>
>
>
>
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