[linux-dvb] [dvbtune] Progressively frequency decreases until "not able to lock"

[Alessandro De Donno <alessandro.dedonno@unile.it>]

Hello,
I downloaded DVB CVS (10 feb), dvbtune CVS (10 feb). Kernel 2.4.20 on a
Slack-current.

Look at this output:
***********************************************************************
# dvbtune -f 12558200000 -p V -s 27500 -n 6666 > dvbtune1.log 2>&1
# cat dvbtune1.log
Using DVB card "STV0299/TSA5059/SL1935 based"
tuning DVB-S to L-Band:1073871640, Pol:V Srate=27500000, 22kHz=off
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_CARRIER
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI
FE_HAS_SYNC
Event:  Frequency: 2136887091 <===============================look here
        SymbolRate: 27500000
        FEC_inner:  3
Bit error rate: 65280
Signal strength: 40952
SNR: 53967
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI
FE_HAS_SYNC
Successfully opened network device, please configure the dvb interface
***********************************************************************

Just the same command:
***********************************************************************
# dvbtune -f 12558200000 -p V -s 27500 -n 6666 > dvbtune2.log 2>&1
# cat dvbtune2.log
Using DVB card "STV0299/TSA5059/SL1935 based"
tuning DVB-S to L-Band:1073871640, Pol:V Srate=27500000, 22kHz=off
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_CARRIER
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI
FE_HAS_SYNC
Event:  Frequency: 2136887089 <===============================look here
        SymbolRate: 27500000
        FEC_inner:  3
Bit error rate: 65280
Signal strength: 40953
SNR: 54045
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI
FE_HAS_SYNC
Successfully opened network device, please configure the dvb interface
***********************************************************************

Just the same command, again:
***********************************************************************
# dvbtune -f 12558200000 -p V -s 27500 -n 6666 > dvbtune3.log 2>&1
# cat dvbtune3.log
Using DVB card "STV0299/TSA5059/SL1935 based"
tuning DVB-S to L-Band:1073871640, Pol:V Srate=27500000, 22kHz=off
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_CARRIER
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_TIMEDOUT FE_HAS_CARRIER
Not able to lock to the signal on the given frequency
***********************************************************************

Sometimes I can't lock the signal since the first time, sometimes the
difference between frequencies are > 100 Hz. Why?
And why those frequencies?
Assuming 
1) 12,5582 GHz > 11,7 GHz => high band => tone signal control ON
(22KHz ON) (I suppose that dvbtune automatically set it ON, starting
from the given frequency, even if in the output the value is OFF);
2) 12,5582 GHz - 10,6 GHz (LNB local frequency) = 1,9582 GHz (so the
signal can reach the card via-coaxial-cable),

why 2,136... as frequency? And... sorry for the partially OT
questions...

BTW, the network interface doesn't work... :-(
I can't see multicast packets incoming. Some weeks ago, with old drivers
I saw those UDP packets.

Tomorrow I'll try Ralph&Marcus drivers and maybe dvb-yyyymmdd and
dvb-newstruct-2003mmdd drivers.

Thanks for your attention :-)

-- 
Cordiali saluti,
Alessandro De Donno (aka aded)

PS: controllo la posta dalle ore 9,30 alle ore 18,30 circa, da lu a ve.

/**********************************************************************
Laboratorio Progetto Reti :: Universita' degli Studi di Lecce
TEL. +39 0832 320310 :: FAX +39 0832 325004
WEB http://netlab.unile.it/~aded
EMAIL alessandro.dedonno@unile.it :: ICQ 177590238
**********************************************************************/


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