[linux-dvb] Re: Leadtek LR6650 (Conexant) scan / lock problems

[Andrew Wilson <agwilson@rhetorical.com>]

I have this card, and I'm not able to lock onto C5 mux, despite it 
consistently being the strongest signal on my DEC 2000-t. Gavin's 
comments about signal strength make sense to me!

I can, however tune no problem to ITV mux which is also QAM64. I'm on 
Craigkelly transmitter, and the DEC box rarely show problems.

I did try (briefly) the Black Gold app, which did manage to scan the C5 
mux, but didn't show a picture on any channel.

Can someone take a couple of minutes to explain what the signal, snr, 
ber and unc stats mean; how are they calculated? Yes I know I could look 
at the code to find out...

Andrew


$ tzap "Channel 4"
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
tuning to 538000000 Hz
video pid 0x0b02, audio pid 0x0b03
status 01 | signal 0029 | snr ffff | ber 00000000 | unc 00000000 |
status 1f | signal 0028 | snr ffff | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK
status 1f | signal 0029 | snr ffff | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK
status 1f | signal 0029 | snr ffff | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK
status 1f | signal 0029 | snr ffff | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK

$ tzap "five"
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
tuning to 490000000 Hz
video pid 0x1781, audio pid 0x1782
status 01 | signal 0057 | snr ffff | ber 00000000 | unc 00000000 |
status 01 | signal 005a | snr ffff | ber 00000000 | unc 00000000 |
status 01 | signal 005a | snr ffff | ber 00000000 | unc 00000000 |
status 01 | signal 005a | snr ffff | ber 00000000 | unc 00000000 |
status 01 | signal 005a | snr ffff | ber 00000000 | unc 00000000 |
status 01 | signal 0059 | snr ffff | ber 00000000 | unc 00000000 |
status 01 | signal 005a | snr ffff | ber 00000000 | unc 00000000 |

$ grep five ~/.tzap/channels.conf
five:490000000:INVERSION_OFF:BANDWIDTH_8_MHZ:FEC_2_3:FEC_NONE:QAM_64:TRANSMISSION_MOD
E_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE:6017:6018:12867

$ grep "Channel 4" ~/.tzap/channels.conf
Channel 
4:538000000:INVERSION_OFF:BANDWIDTH_8_MHZ:FEC_2_3:FEC_NONE:QAM_64:TRANSMISSIO
N_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE:2818:2819:8384
agwilson@phoenix:~$