[linux-dvb] Nova-T 500 with SNR = 0

Jean-Edouard Babin radius at gmail.com
Wed Feb 7 17:26:39 CET 2007


Hello,

I have a Nova-T 500 card in a system running Linux 2.6.20.
If i run w_scan things look to be fine:

# ./w_scan
w_scan version 20060902
Info: using DVB adapter auto detection.
  Found DVB-T frontend. Using adapter /dev/dvb/adapter0/frontend0
-_-_-_-_ Getting frontend capabilities-_-_-_-_
frontend DiBcom 3000MC/P supports
INVERSION_AUTO
QAM_AUTO
TRANSMISSION_MODE_AUTO
GUARD_INTERVAL_AUTO
HIERARCHY_AUTO
FEC_AUTO
-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
177500:
184500:
191500:
198500:
205500:
212500:
219500:
226500:
474000:
482000: signal ok (I999B8C999D999M999T999G999Y999)
490000: signal ok (I999B8C999D999M999T999G999Y999)
498000:
506000: signal ok (I999B8C999D999M999T999G999Y999)
514000: signal ok (I999B8C999D999M999T999G999Y999)
522000:
530000:
538000:
546000: signal ok (I999B8C999D999M999T999G999Y999)
554000:
[...]
858000:
tune to: :482000:I999B8C999D999M999T999G999Y999:T:27500:
    Direct 8(NTN)
    TMC(NTN)
    BFM TV(NTN)
    i>TELE(NTN)
    Europe 2 TV(NTN)
    Gulli(NTN)
Network Name 'r?seau num?rique terrestre fran?ais'
tune to: :490000:I999B8C999D999M999T999G999Y999:T:27500:
Network Name 'r?seau num?rique terrestre fran?ais'
    PARIS PREMIERE(MULTI4)
    TF6(MULTI4)
    M6(MULTI4)
    W9(MULTI4)
    NT1(MULTI4)
    AB1(MULTI4)
tune to: :506000:I999B8C999D999M999T999G999Y999:T:27500:
    CANAL+(CNH)
    CANAL+ CINEMA(CNH)
    CANAL+ SPORT(CNH)
    PLANETE(CNH)
    CANAL J(CNH)
    (null)(CNH)
    (null)(CNH)
Network Name 'r?seau num?rique terrestre fran?ais'
tune to: :514000:I999B8C999D999M999T999G999Y999:T:27500:
    TF1(SMR6)
    NRJ12(SMR6)
    TPS STAR(SMR6)
    Eurosport France(SMR6)
    LCI(SMR6)
Network Name 'R?seau Num?rique Terrestre Fran?ais'
tune to: :546000:I999B8C999D999M999T999G999Y999:T:27500:
    France 2(GR1)
    France 4(GR1)
    France 5(GR1)
    ARTE(GR1)
    LCP(GR1)
    France 3(Nat)
    (null)(ATH)
Network Name 'r?seau num?rique terrestre fran?ais'
dumping lists (33 services)
Direct 8:482000:I999B8C999D999M999T999G999Y999:T:27500:160:80:32:0:513:0:0:0
[02ff]:482000:I999B8C999D999M999T999G999Y999:T:27500:0:0:0:0:767:0:0:0
Gulli:482000:I999B8C999D999M999T999G999Y999:T:27500:165:100:0:0:518:0:0:0
Europe 2 TV:482000:I999B8C999D999M999T999G999Y999:T:27500:164:96:0:0:517:0:0:0
i>TELE:482000:I999B8C999D999M999T999G999Y999:T:27500:163:92:0:0:516:0:0:0
BFM TV:482000:I999B8C999D999M999T999G999Y999:T:27500:162:88:0:0:515:0:0:0
TMC:482000:I999B8C999D999M999T999G999Y999:T:27500:161:84:0:0:514:0:0:0
[04ff]:490000:I999B8C999D999M999T999G999Y999:T:27500:0:0:0:0:1279:0:0:0
M6:490000:I999B8C999D999M999T999G999Y999:T:27500:120:130;131:140:0:1025:0:0:0
W9:490000:I999B8C999D999M999T999G999Y999:T:27500:220:230:240:0:1026:0:0:0
NT1:490000:I999B8C999D999M999T999G999Y999:T:27500:320:330:0:0:1027:0:0:0
PARIS PREMIERE:490000:I999B8C999D999M999T999G999Y999:T:27500:0:430,431:441:1:1028:0:0:0
TF6:490000:I999B8C999D999M999T999G999Y999:T:27500:0:530:540:1:1029:0:0:0
AB1:490000:I999B8C999D999M999T999G999Y999:T:27500:0:630:0:1:1030:0:0:0
CANAL+:506000:I999B8C999D999M999T999G999Y999:T:27500:0:80,81;83:32:0:769:0:0:0
[03f1]:506000:I999B8C999D999M999T999G999Y999:T:27500:0:0:0:0:1009:0:0:0
[03f0]:506000:I999B8C999D999M999T999G999Y999:T:27500:0:0:0:0:1008:0:0:0
CANAL J:506000:I999B8C999D999M999T999G999Y999:T:27500:0:96:0:1:773:0:0:0
PLANETE:506000:I999B8C999D999M999T999G999Y999:T:27500:0:92:0:1:772:0:0:0
CANAL+ SPORT:506000:I999B8C999D999M999T999G999Y999:T:27500:0:88,89:38:0:771:0:0:0
CANAL+ CINEMA:506000:I999B8C999D999M999T999G999Y999:T:27500:0:84,85:35:1:770:0:0:0
TF1:514000:I999B8C999D999M999T999G999Y999:T:27500:120:130;131:140:0:1537:0:0:0
NRJ12:514000:I999B8C999D999M999T999G999Y999:T:27500:220:230;231:0:0:1538:0:0:0
LCI:514000:I999B8C999D999M999T999G999Y999:T:27500:0:330:0:1:1539:0:0:0
Eurosport France:514000:I999B8C999D999M999T999G999Y999:T:27500:0:430:0:1:1540:0:0:0
TPS STAR:514000:I999B8C999D999M999T999G999Y999:T:27500:0:530,531:540:0:1541:0:0:0
France 2:546000:I999B8C999D999M999T999G999Y999:T:27500:120:130:0:0:257:0:0:0
France 4:546000:I999B8C999D999M999T999G999Y999:T:27500:420:430:0:0:259:0:0:0
France 5:546000:I999B8C999D999M999T999G999Y999:T:27500:320:330:0:0:260:0:0:0
ARTE:546000:I999B8C999D999M999T999G999Y999:T:27500:520:530,531:0:0:261:0:0:0
LCP:546000:I999B8C999D999M999T999G999Y999:T:27500:620:630:0:0:262:0:0:0
France 3:546000:I999B8C999D999M999T999G999Y999:T:27500:220:230:0:0:279:0:0:0
[01ff]:546000:I999B8C999D999M999T999G999Y999:T:27500:0:0:0:0:511:0:0:0
Done.

But in fact when looking with tzap i see a SNR of 0 instead of
status 01 | signal a97c | snr 0000 | ber 001fffff | unc 00000000 |
status 01 | signal a982 | snr 0000 | ber 001fffff | unc 00000000 |
status 01 | signal a9a6 | snr 0000 | ber 001fffff | unc 00000000 |

I can't understand why the SNR is 0. in fact my problem really look
like this one:
http://www.linuxtv.org/pipermail/linux-dvb/2006-October/013883.html

I have others mono tuner card working fine...



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