[linux-dvb] Help-- Receive C band program using WinTV Nova

[Ralph Metzler <rjkm@convergence.de>]

Frankta writes:
 > Dear sir,
 >    I have a problem about receiving C band program by using WinTV NOVA.
 >    My parameter is LNB 5150  Freq 3780 SR 30800 
 >    driver 2001-8-16
 >    I have an "old" DVB-S card(demodulator is VES1893).When I try to receive the program with these parameters by using szap, everything is OK.
 >    Now,I have got a WINTV NOVA(REV 1.1 with tuner STV0299), it can work on Ku band.When I try to receive the C-band with the same szap and parameters,cannot sync.
 >    Any suggestions will be really apreciated.
 > 

Are they using spectral inversion?
The VES1893 can automatically detect this, the STV0299 cannot.
So, maybe this is the reason that you cannot receive it with 
the STV0299.

The spectral inversion in the STV0299 can be set in register 0x0c.
Since this register also contains the bits for voltage control it
is written in SetVoltage() in DVB/driver/dvb.c.
Please change


        if (dvb->demod_type==DVB_DEMOD_STV0299)
                demod_writereg(dvb, 0x0c, 1|(power ? 0x40 : 0)|(voltage ? 0x10 : 0));


into

        if (dvb->demod_type==DVB_DEMOD_STV0299)
                demod_writereg(dvb, 0x0c, (power ? 0x40 : 0)|(voltage ? 0x10 : 0));


After this all other channels should no longer work.
Please tell me if you "problem channel" now works. 


I also asked before on this list which satellite (not C band, I cannot
receive that) in Europe sends with spectral inversion so that 
I can test this and build an automatic switch into the driver. Anyone?


Ralph



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