[linux-dvb] TT budget problem not generating 22 kHz Band switching signal

Joerg Riechardt J.Riechardt at gmx.de
Fri Sep 16 12:51:03 CEST 2005


Wöckinger Johann wrote:

> Hi,
> I can almost not believe it - nobody has encountered this problem before me ?
> (see below, submitted already on Wed. 14 sept.) - Or, I submitted my problem to the wrong list?
> If this cards are as widely used as one can see in various publications,
> I should not be the first who deals with it.
> I have no idea, how this should be caused by my specific hardware/software setup.
> I did more tests using the set22k / setvoltage utility included in the dvb-apps -
> setvoltage does as expected, set22k does not give any error message, but no tone signal appears.
> Maybe there are more specific analysing tools / possibilities (get detailed status from device ....)
> 
> Again, please help if anybody has some idea.
> Johann Woeckinger 
> 
> Originally submissed article:
> 
> Up to now, I used a vdr setup with one TT FF card with CI/CAM with success. 
> Now, I added a 2nd card (TT budget - ALPS tuner, requested modules dvb-ttpci-budget, stv0299),
> encountering the following problem:
> on the budget card, I can not receive any transponder in the high band. Analysing the problem 
> I found out, that the card does not generate the necessary 22kHz signal at all (measured with oscilloscope,
> so I can exclude that I deal with a signal level problem!) - after some more tests using dvb-tools
> to switch polarisation (works) / low-high band (not working) I concluded to have a malfunctioning card. 
> The supplier exchanged the card to an other TT budget (philips tuner, requested modules dvb-ttpci-budget-ci, stv0299) exemplar, but the situation did not change.
> With this card still no switch to high band possible - same problem. 
> So, now I think the problem is not in the card - but in the software drivers?! 
> I tried c't VDR 4 (linuxdvb 1.1.1) and LinVDR 0.7 with same result. 
> Can anybody give me help, please? 
> In the moment I have no idea how to proceed - I did not expect to get so serios problems with a TT card,
> everywhere they are recommended as best choice. 
> 

Some LNB's and Diseqc switches don't react to the 22kHz signal the cards 
give. See http://www.linuxdvb.tv/documentation/22khz/ . But maybe your 
problem is different. You could check, if the LNBP gets the signal to 
produce 22kHz (high on ENT), see 
http://www.st.com/stonline/products/literature/ds/5816/lnbp10.htm
Jörg



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