From: "Andrew de Quincey" <[EMAIL PROTECTED]>
Searching on the web led me to a philips document ("su1278.pdf") which describes the optimal settings for the SU1278 on page 10. The driver is not using these right now. I'm experimenting with the recommended ones, and they do seem to help.
FWIW, in my Windows driver, I have changed one STV0299B setting compared to the recommended ones: The recommended AGC2 Reference Level (m2) is 0x19, but I found that setting it to 0x1F (the maximum) appears to give a better SNR...
BTW: I also found an issue with low symbol rates: The STV0299B datasheet says that the gain CFD[6:4] MUST NOT exceed the coefficient e[3:0], as that may lead to instability. But when you take the recommended STV0299B settings from the SU1278 datasheet, that is the case for symbol rates <5 MBaud. Since I do not receive any transponders with such a low symbol rate, I have not been able to verify if there is indeed a problem...
You find some transponders with about 4kSyms/sec on Hotbird if you want to test.
Holger
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