On 06/30/2011 05:27 AM, Ralf wrote: > > > Hi Marcus, thanks for your reply. > > That is very important for us to understand. How is the divider 512 > determined? It is in the FPGA I suppose. > Where can read more about the FPGA besides this small text? > http://www.gnu.org/software/gnuradio/doc/exploring-gnuradio.html#fpga The FPGA supports a maximum interpolation ratio of 512. Interpolation ratios must be even. > > Can we only put proper divisors of 128MHz in terms of datarate into > the UHD sink even above 250kHz? Yup. Only bandwidths that result in an even interpolation ratio from the 128MHz DAC sample rate can be used.
> > Actually we need to put ~10kbit/s of data onto a ~400kHz carrier. Is > the GRC repeater the right functionality > to interpolate the small datarate as shown in the attached setup? > Normally, if you need to use a "weird" sample rate, you'd use something like the fractional interpolator block just before you send the stream to the UHD sink. Do you mean a carrier that is 400kHz in bandwidth, or a carrier at 400kHz center frequency? The center frequency isn't really relevant to this discussion, but the bandwidth is. -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
