From: "Holger Waechtler" <[EMAIL PROTECTED]> > Some of the VES1820 based cards have the I/Q wires between > PLL/Synthesizer and Demodulator swapped, so you don't know in advance > whether INVERSION_OFF is really INVERSION_OFF or not.
Then the driver should detect the hardware type and makre sure that INVERSION_OFF really results in the entire card being "inversion neutral". We've actually had this discussion before... :) I don't think a "try&error" method at runtime is the proper solution to this. > If I remember correctly the Hauppauge cards designed by Technotrend > and the old Siemens cards have the exactly opposite setting. I have both a Siemens-Cable card as well as a TechnoTrend budget DVB-C card (0x1004, with ALPS TDBE2 tuner) and they both work the same - the INVQ bit has to be SET for the card to be inversion neutral (the tuner spectrally inverts the signal by using a PLL frequency ~36MHz above the target RF). i.e. for those two cards: INVERSION_OFF -> SET INVQ bit in CONF INVERSION_ON -> CLEAR INVQ bit in CONF Regards, -- Robert Schlabbach e-mail: [EMAIL PROTECTED] Berlin, Germany -- Info: To unsubscribe send a mail to [EMAIL PROTECTED] with "unsubscribe linux-dvb" as subject.
