[linux-dvb] Hauppauge WINTV Nova-T 500 PCI

Maillist maillist at jarkeborn.se
Sat Sep 1 07:54:05 CEST 2007


>> Joacim wrote:
>>> I executed dvbsnoop (with -s singal) during a scan and when finding channels
>>> I
>>> got:
>>> Sig: ~46000
>>> SNR: 0 (?????)
>>> BER: 0
>>>
>>> Can I trust the values from dvbsnoop?? Any better tool??
>>
>> I use femon from the dvb-tools package (or the VDR-plugin named the same).
>>
>> /Richard
>
> I tested 'tzap' and 'femon'
>
> root at frodo:/home/joacim# tzap -a 0 "Nickelodeon"
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> tuning to 594000000 Hz
> video pid 0x03bf, audio pid 0x03be
> status 0b | signal 8fff | snr 0000 | ber 001fffff | unc 00003c4c |
> status 1f | signal 9036 | snr 0000 | ber 00000000 | unc 00002347 | FE_HAS_LOCK
> status 1f | signal 9040 | snr 0000 | ber 00000000 | unc 00003e98 | FE_HAS_LOCK
> status 1f | signal 902e | snr 0000 | ber 00000000 | unc 00003c57 | FE_HAS_LOCK
> status 1f | signal 9014 | snr 0000 | ber 00000000 | unc 00003efe | FE_HAS_LOCK
>
> root at frodo:/home/joacim# femon -a 0
> using '/dev/dvb/adapter0/frontend0'
> FE: DiBcom 3000MC/P (TERRESTRIAL)
> status 1f | signal 8e6e | snr 0000 | ber 00000000 | unc 00003ef9 | FE_HAS_LOCK
> status 1f | signal 8e6e | snr 0000 | ber 00000000 | unc 00003ef9 | FE_HAS_LOCK
> status 1f | signal 8e6e | snr 0000 | ber 00000000 | unc 00003ef9 | FE_HAS_LOCK
> status 1f | signal 8e6e | snr 0000 | ber 00000000 | unc 00003ef9 | FE_HAS_LOCK
> status 1f | signal 8e6e | snr 0000 | ber 00000000 | unc 00003ef9 | FE_HAS_LOCK
>
>
> I get SNR 00000 with both apps, singal varies a bit between them.
> Is it possible to get SNR info out of Nova-T or could it that bad ???
>
> --
> Regards
> Joacim
>

One other question (since I don't have total grip of this area).
I have also 2 Dreamboxes and those are showing:
SNR: 99%
AGC: 60%
BER: 0

SNR, I understand quite well I think. Higher values means better quality and
less noise. I should not only focus on high values but also a stable value.

AGC, I don't understand. Can someone explain this??

BER, I think I understand this, Bit Error Rate means errors in the signal that
could not be interpreted by the receiver. Should be as low as possible.

Please correct me and/or fill in to increase my knowledge :)

Regards
Joacim





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