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Sylvain Munaut 246tnt at gmail.comHi, > I don't understand what is happening here. 1 MHz is an even multiple of > 250kHz, so maybe I'm getting an image of OAK overpowering the relatively > weaker SFO signal. But should there not be filters that manage this? Yes most likely an image. > I guess I was expecting that if the device is set to 250ksps, then it would > "close down" filters appropriately to reject signals out of that band. But > maybe the filters don't work properly below a certain sample rate? Like the > rtl2832 can sample down to 250ksps, but the 820T tuner was not designed for > it? The filters you'd need wouldn't be in the R820T anyway (it has filters but not that narrow). IIRC, the rtl2832 always sample at a fixed high frequency but it has an internal downconverter + FIR filter inside to convert the sample rate down. But that FIR probably can't handle such a big reduction ... > Can I control the filters directly? If you find out, let us know, but AFAIK all attempts so far didn't succeed to get it more narrow than this. Cheers, Sylvain