[linux-dvb] ves1820 FEC, have problems with cable provider

thomas schorpp t.schorpp at gmx.de
Sun Jul 24 13:23:33 CEST 2005


Christian Kaenzig wrote:
> Le Dimanche, 24 Juillet 2005 11:54, thomas schorpp a écrit :
> [..]
> 
>>>Yep. Everything is working right. So what is your issue?
>>
>>yes, but only that time and that channel.
>>
> 
> [...]
> 
>>this is the issue (several hours a day):
>>
>>kabelbw karlsruhe + mannheim:
>>
> 
> [...]
> 
>>schorpp at tom1:~$ femon
>>using '/dev/dvb/adapter0/frontend0'
>>FE: VLSI VES1820 DVB-C (CABLE)
> 
> [...]
> 
>>status 1f | signal ffff | snr d1d1 | ber 006511de | unc ffffffff |
>>FE_HAS_LOCK
>>status 1f | signal ffff | snr d5d5 | ber 006511de | unc 00000071 |
>>FE_HAS_LOCK
>>status 1f | signal ffff | snr cfcf | ber 006511de | unc ffffffff |
>>FE_HAS_LOCK
>>
>>...
>>strange signal interferences snr leading to high ber and unc blocks.
>>
>>picture distorted, high level bursts on audio killed a tweeter coil of
>>my expensive audio equipment last week. the power amps protection
>>circuits are too slow for that.
> 
> [..]
> 
>>any opionions/comment?
> 
> 
> First, you are running femon while having your adapter used by some software, 
> right (e. g. czap, ..) ? If I run femon without an app. using the card, I get 
> that signal 'ffff'.

sure, you need to tune to a channel first, dont you?

vdr is running here.

> 
> That said, I also had this kind of problems with some channels at some hours 
> of the day. The transponders around 300 MHz would always work fine but the 
> ones over 500 MHz only between 21h - 08h. I could get the latter almost 
> working all day by plugging the dvb-c card directly to the wall outlet with a 
> short cable.

tuned to ~ 426 MHz at the moment.

> 
> So I guessed the signal strength was not high enough for my card on the higher 
> frequencies. I bought an antenna amplifier and that solved my problem.

checked a week before. looped through the antenna amp of my vhs vcr
since. no diffrence, sorry.

> 
> 
> Christian

tom




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