[linux-dvb] Technisat Airstar 2 DVB-T: tuning unreliable

[Thomas <mythml@wolke7.net>]

Hi all,

thanks to help from this list I managed to get my Airstar2 (Samsung 
tuner, using modules mt352, skystar2) going in general. Unfortunately I 
have been happy to early.

Tuning is quite unreliable for a lot of channels. DVB-T signal is 
usually no problem here. At least my stand alone receiver has no 
problems.

This is a log trying to tune with tzap:
--------------
root@mythtv root]# /usr/local/bin/tzap rtl
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
tuning to 642000000 Hz
video pid 0x0171, audio pid 0x0172
status 00 | signal 013f | snr 0000 | ber 00000000 | unc 00000000 |
status 00 | signal 013f | snr 0000 | ber 00000000 | unc 00000000 |
status 00 | signal 013f | snr 0000 | ber 00000000 | unc 00000000 |
status 00 | signal 013f | snr 0000 | ber 00000000 | unc 00000000 |

[root@mythtv root]# /usr/local/bin/tzap arte
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
tuning to 482000000 Hz
video pid 0x00c9, audio pid 0x00ca
status 00 | signal 013f | snr 0000 | ber 00000000 | unc 00000000 |
status 1f | signal 013f | snr d7d7 | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK
status 1f | signal 013f | snr d5d5 | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK
status 1f | signal 013f | snr d7d7 | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK

[root@mythtv root]# /usr/local/bin/tzap rtl
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
tuning to 642000000 Hz
video pid 0x0171, audio pid 0x0172
status 1f | signal 013f | snr d7d7 | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK
status 1f | signal 013f | snr d9d9 | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK
status 1f | signal 013f | snr d4d4 | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK

------------------
This sequence has been done within 1 minute without any changes. The 
strange thing is that some channels, like "art" above do not have any 
problems at all. They always tune in. Others, like "rtl", only lock 
sometimes.

Any ideas about this?
Anything else I can try to narrow this problem?

Thomas