Dne 10.9.2014 22:50, Malcolm Robb napsal(a): > Hu, > I'm currently sampling a 2Mhz digital data stream at 2MHz, so obviously I'm > suffering quite badly from Nyquist issues. Ideally I'd like to sample at > either 4Mhz, or better still 8Mhz. I understand that theoretically I can set > the dongle to sample at 3.2Mhz, but that data loss is virtually inevitable. > The highest reliable sample rate is 2.4Mhz. So my questions are: > > 1) What is the cause of the data loss? - is it in the dongle, or in the PC > chipset, or in the PC driver/DLL software? > > 2) Has anyone tried increasing the crystal frequency in the dongle - i.e. > overclocking it? Suppose I change the 28.8Mhz for a (28.8 * (4.0 / 2.4)) = > 48Mhz one, will that allow me to sample at 4Mhz by using the settings for > 3.4Mhz? Obviously there in no gaurantee that the RTL2832 will work at all if > you overclock by too much. You cannot overclock it, because you will overclock also USB (which will not work).
> > Cheers > Malcolm
