[vdr] Channel dropout unless femon active

Richard Scobie r.scobie at clear.net.nz
Mon Aug 26 21:26:35 CEST 2013

Klaus Schmidinger wrote:
> On 25.08.2013 21:31, Richard Scobie wrote:
>> Klaus Schmidinger wrote:
>>> On 25.08.2013 05:32, Richard Scobie wrote:
>>>> Perhaps a little off topic, but I wonder if anyone can shed any light
>>>> on the following.
>>>> I am viewing a signal that is very close to reception threshold - dish
>>>> a little small, STR value 65%, SNR value 67%, but BER and UNC errors
>>>> as reported by femon are zero.
>>>> As long as I leave the femon plugin active on screen, I can view it
>>>> uninterrupted. If I turn it off, within 60 seconds, the picture will
>>>> disappear until I activate femon again.
>>>> Initally it will only show "SIGNAL" and "CARRIER" indicators active,
>>>> then after a short period, everything will lock again and the channel
>>>> will re-appear.
>>>> I am running the latest vdr version with a TT 6400 S2 full feature
>>>> card, with latest drivers and firmware. Relevent drivers would be
>>>> perhaps stv090x or stv6110x.
>>>> Channel parameters DVB-S2, symbol rate 15000 FEC 3/5  QPSK Video 35Mb
>>>> MPEG2 1920 x 1080, Audio MPEG 270Mb
>>> Do you have both inputs of the TT-S2 6400 connected to satellite cables?
>>> And is there actually a signal on both of them?
>> Hi Klaus,
>> I have three dishes with dual LNB's, with each LNB output going to two
>> 4x1 diseq switches, feeding each tuner, so both tuners have the same
>> signals available.
>> As two whether the other tuner always has a signal present, I cannot
>> say for sure as my channel list has quite a number of itinerant feed
>> channels loaded, which are not always active, so vdr may well be
>> scanning  across empty channels on the second tuner.
>> Indeed, this channel I am having trouble with is one of those - a feed
>> from a motor sport event and is only there on certain weekends.
>> My somewhat uninformed thought was that perhaps femon's constant
>> polling for front end values was somehow causing a marginal PLL to
>> re-lock, vs the no femon situation where it looses lock on the weak
>> signal and does not reaquire it.
> Well, VDR also constantly polls the frontend to see whether it is still
> locked.
> I'm afraid I'm out of ideas then...

Hi Klaus,

No problem, thanks for taking the time to reply anyway.



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