Tvheadend

Hello everybody,

I have a problem I can't solve.
I'm running a Jaunty config and installed the Tvheadend 2.12.
I'm currently using a Hauppauge WinTV-HVR-1200 DVB-T on PCie (also try with a AverTV Hybrid+FM Volar HX A827 on USB and have the same issue) I also tried them on 2 different computers under Jaunty and Lucid and each time is the same... So maybe I do something wrong.
After installing Tvheadend and connecting through the webGui, I go to configuration > TVadapter > select it from the dropdown list > go to "Add dvb network by location..." > Select France - Nancy
then going to the multiplexes tab it shows me 6 muxes. I have the signal monitoring enable. On every mux it is 100% and then it starts dropping down to reach 0% and then it keeps scanning and found nothing.

My signal is good as with the same cable I can view channels on my TV and also with MythTV (but I don't like it)

Here is my debug log :

Loglevel debug: enabled
Apr 09 11:00:08 dvb: "/dev/dvb/adapter0" tuning to "682,166 kHz" (Autoscan)
Apr 09 11:00:32 dvb: New mux "522,166 kHz" created by built-in configuration from "Nancy" 
Apr 09 11:00:32 dvb: "/dev/dvb/adapter0" tuning to "522,166 kHz" (Initial autoscan)
Apr 09 11:00:32 dvb: New mux "682,166 kHz" created by built-in configuration from "Nancy" 
Apr 09 11:00:32 dvb: New mux "794,166 kHz" created by built-in configuration from "Nancy" 
Apr 09 11:00:32 dvb: New mux "770,166 kHz" created by built-in configuration from "Nancy" 
Apr 09 11:00:32 dvb: New mux "498,166 kHz" created by built-in configuration from "Nancy" 
Apr 09 11:00:32 dvb: New mux "826,166 kHz" created by built-in configuration from "Nancy" 
Apr 09 11:00:41 dvb: "522,166 kHz" on adapter "NXP TDA10048HN DVB-T", status changed to No signal
Apr 09 11:00:53 dvb: "/dev/dvb/adapter0" tuning to "682,166 kHz" (Initial autoscan)
Apr 09 11:01:02 dvb: "682,166 kHz" on adapter "NXP TDA10048HN DVB-T", status changed to No signal
Apr 09 11:01:15 dvb: "/dev/dvb/adapter0" tuning to "794,166 kHz" (Initial autoscan)
Apr 09 11:01:24 dvb: "794,166 kHz" on adapter "NXP TDA10048HN DVB-T", status changed to No signal
Apr 09 11:01:36 dvb: "/dev/dvb/adapter0" tuning to "770,166 kHz" (Initial autoscan)
Apr 09 11:01:45 dvb: "770,166 kHz" on adapter "NXP TDA10048HN DVB-T", status changed to No signal
Apr 09 11:01:57 dvb: "/dev/dvb/adapter0" tuning to "498,166 kHz" (Initial autoscan)
Apr 09 11:02:06 dvb: "498,166 kHz" on adapter "NXP TDA10048HN DVB-T", status changed to No signal
Apr 09 11:02:18 dvb: "/dev/dvb/adapter0" tuning to "826,166 kHz" (Initial autoscan)
Apr 09 11:02:27 dvb: "826,166 kHz" on adapter "NXP TDA10048HN DVB-T", status changed to No signal
Apr 09 11:02:39 dvb: "/dev/dvb/adapter0" tuning to "522,166 kHz" (Autoscan)
Apr 09 11:03:00 dvb: "/dev/dvb/adapter0" tuning to "682,166 kHz" (Autoscan)
Apr 09 11:03:21 dvb: "/dev/dvb/adapter0" tuning to "794,166 kHz" (Autoscan)
Apr 09 11:03:42 dvb: "/dev/dvb/adapter0" tuning to "770,166 kHz" (Autoscan)
Apr 09 11:04:03 dvb: "/dev/dvb/adapter0" tuning to "498,166 kHz" (Autoscan)
Apr 09 11:04:24 dvb: "/dev/dvb/adapter0" tuning to "826,166 kHz" (Autoscan)
Apr 09 11:04:45 dvb: "/dev/dvb/adapter0" tuning to "522,166 kHz" (Autoscan)
Apr 09 11:05:06 dvb: "/dev/dvb/adapter0" tuning to "682,166 kHz" (Autoscan)
Apr 09 11:05:28 dvb: "/dev/dvb/adapter0" tuning to "794,166 kHz" (Autoscan)
Apr 09 11:05:49 dvb: "/dev/dvb/adapter0" tuning to "770,166 kHz" (Autoscan)
Apr 09 11:06:10 dvb: "/dev/dvb/adapter0" tuning to "498,166 kHz" (Autoscan)
Apr 09 11:06:31 dvb: "/dev/dvb/adapter0" tuning to "826,166 kHz" (Autoscan)
Apr 09 11:06:52 dvb: "/dev/dvb/adapter0" tuning to "522,166 kHz" (Autoscan)
Apr 09 11:07:13 dvb: "/dev/dvb/adapter0" tuning to "682,166 kHz" (Autoscan)
Apr 09 11:07:35 dvb: "/dev/dvb/adapter0" tuning to "794,166 kHz" (Autoscan)
Apr 09 11:07:56 dvb: "/dev/dvb/adapter0" tuning to "770,166 kHz" (Autoscan)
Apr 09 11:08:17 dvb: "/dev/dvb/adapter0" tuning to "498,166 kHz" (Autoscan)
Apr 09 11:08:38 dvb: "/dev/dvb/adapter0" tuning to "826,166 kHz" (Autoscan)
Apr 09 11:08:59 dvb: "/dev/dvb/adapter0" tuning to "522,166 kHz" (Autoscan)
Apr 09 11:09:20 dvb: "/dev/dvb/adapter0" tuning to "682,166 kHz" (Autoscan)
Apr 09 11:09:43 dvb: "/dev/dvb/adapter0" tuning to "794,166 kHz" (Autoscan)
Apr 09 11:10:02 dvb: "/dev/dvb/adapter0" tuning to "770,166 kHz" (Autoscan)
Apr 09 11:10:23 dvb: "/dev/dvb/adapter0" tuning to "498,166 kHz" (Autoscan)
Apr 09 11:10:44 dvb: "/dev/dvb/adapter0" tuning to "826,166 kHz" (Autoscan)
Apr 09 11:11:05 dvb: "/dev/dvb/adapter0" tuning to "522,166 kHz" (Autoscan)

Any help, advices or ideas would be much appreciated

and sorry if my English is too bad... I didn't practice for a long time...