[From nobody Fri Sep  2 13:31:32 2005
Message-ID: <4228BE91.4090201@dtek.chalmers.se>
Date: Fri, 04 Mar 2005 21:01:21 +0100
From: Anders Gunnarsson <d00guan@dtek.chalmers.se>
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To: "andi_s@BonBon.net" <andi_s@BonBon.net>
Subject: Re: [linux-dvb] HELP: strange problem with siemens dvb-c card
References: <422339AD.1020603@BonBon.net> <20050304134556.GB9312@linuxtv.org>
	<4228A6B0.2090101@BonBon.net>
In-Reply-To: <4228A6B0.2090101@BonBon.net>
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Just got introduced to the PWM settign myself and have solved most of my 
reception problem. I use the siemens dvb-c v1.5 card. After you load you 
drivers you can check your cards default pwm-setting with dmesg.

It was posted in a previous message that you can't give the pwm-value as 
a parameter when you load your modules anymore, but you can if you have 
older drivers. From my own simple tests I've seen that reception gets 
better for higher pwm-values but the tuning gets slower. The tip that 
one should try to get a AFC value close to zero doesn't seem to apply 
for my card.

I also got a tip that a change of the tune-delay could help to get 
better reception. Has been reported to improve for TT2.1, but I couldn't 
see any changes for my siemens other than that tuning is faster for some 
delays.

The best settings I've found so far is the following, try to edit these 
rows in insmod.sh

insmod ./dvb-core.o dvb_override_tune_delay=800
insmod ./ves1820.o pwm=0x64 (add verbose=1 after pwm to see your AFC-value)

For me tuning is reasonably fast, a few seconds and reception is very 
good. Hope you solve your problem.

/Anders

andi_s@BonBon.net wrote:

>> Seems like you have trouble with the signal? Or maybe with the PWM
>> parameter?
>
> the signal from my cable provider is OK (it works on windows)
>
> PWM parameter??? i searched for it and it seems it is a kind of 
> frequency adjustment, but as i am new to linux i do not know where/how 
> to set/change this. any hints howto do this?
>
>> All I can say is: works for me:
>>
>> $ czap zdf
>> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
>> reading channels from file '/home/js/.czap/channels.conf'
>>   1 ZDF:394000000:INVERSION_OFF:6900000:FEC_NONE:QAM_64:110:120
>>     1 ZDF: f 394000000, s 6900000, i 0, fec 0, qam 3, v 0x6e, a 0x78
>>     status 1f | signal 8585 | snr c0c0 | ber 00029220 | unc ffffffff 
>> | FE_HAS_LOCK
>
> if have similiar output with czap (same freq etc. here)
> status 00 | signal 8989 | snr b4b4 | ber 000062d4 | unc ffffffff |
> status 00 | signal 8585 | snr b9b9 | ber 000062d4 | unc ffffffff |
> status 00 | signal 8585 | snr b6b6 | ber 000062d4 | unc ffffffff |
> status 00 | signal 8585 | snr b6b6 | ber 000062d4 | unc ffffffff |
> status 00 | signal 8585 | snr b7b7 | ber 000062d4 | unc ffffffff |
> status 06 | signal 8585 | snr b5b5 | ber 000062d4 | unc ffffffff |
> status 00 | signal 8787 | snr b8b8 | ber 000062d4 | unc ffffffff |
>
> but no FE_HAS_LOCK and status is always zero except the single line 
> with "06", but i don't know what this means... )-:
>
> are you using kernel 2.6.10 and latest firmware or anything else???
>
> andi
>
>
>
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> linux-dvb@linuxtv.org
> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb



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