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

thomas schorpp t.schorpp at gmx.de
Sun Jul 24 14:16:59 CEST 2005


Christian Kaenzig wrote:
> Le Dimanche, 24 Juillet 2005 13:23, thomas schorpp a écrit :
> 
>>>>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
>>>>
> 
> [...]
> 
>>>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.
> 
> 
> I asked because sometimes, when I tune to a channel, quit the app and wait 5 
> seconds I get exactly that kind of output, i. e. signal ffff, unc fff... and 
> sometimes FE_HAS_LOCK.
> 
> 
>>>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.
> 
> 
> Are you sure you vcr has an amplifier built in and not just a 'T' ? The 
> amplifier I'm talking about was sold for ~ 60 CHF (~ 40 €) so it might be a 
> bit expensive just for testing...

panasonic nv-hd636, it has an amplifier, this is best design practice
for decoupling. anyway, signal strength is full as you can see in the
femon log above at the dvb-c card, without, its lower.

> 
> I don't have a vcr around anymore but given the test I did some years ago in 
> the analog world, my vcr didn't have an amplifier (although it was not a 
> particularly cheap one IIRC). But things might have changed since then, I 
> don't know.

ive used it with a bt878 analog card before, with good quality gain.

> 
> 
>>tom
> 
> 
> Hope this helps, but sorry if it doesn't :) !
> 
> Christian
> 

thx,
tom






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