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

Wöckinger Johann johann.woeckinger at epluse.at
Mon Sep 19 13:41:04 CEST 2005


Hi,

I did more analysis by measuring various signals on the card. I found out, that
the card does not use the LNBP13SP's built in tone generator (ENT grounded) but feeds
this signal available from the STV0299B to the external modulation input of the LNBP13 via
a RC-Network. T saw this signal on the source (STV0299) side of the coupling capacitor,
but not on the LNBP's pin to which this capacitor ist connected.
There, only a 0.2VDC voltage could be measured.
Maybe the LNBP13SP does not working well - or the coupling capacitor has a problem.
I will communicate this to the card supplier. Maybe its really a hardware problem on the card.

J. Woeckinger


-----Ursprüngliche Nachricht-----
Von: linux-dvb-bounces at linuxtv.org
[mailto:linux-dvb-bounces at linuxtv.org]Im Auftrag von Joerg Riechardt
Gesendet: Freitag, 16. September 2005 12:51
An: linux-dvb at linuxtv.org
Betreff: Re: [linux-dvb] TT budget problem not generating 22 kHz Band
switchingsignal


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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