Hi Marcus -- I am selecting complex taps from the drop down, but still get an error at runtime if either cutoff frequency is 0 or smaller.
Thanks, John ---- On Sep 5, 2011, at 11:46 AM, "Marcus D. Leech" <[email protected]> wrote: > On 05/09/11 10:19 AM, John Ackermann N8UR wrote: >> I'm generating two NBFM signals, offsetting them plus and minus 25 kHz >> with FreqXlatingFilters, and combining the output in an adder which >> then drives a USRP sink. It seems sensible to put a bandpass filter >> on the result. >> >> I have a basic conceptual confusion. I would think that you'd specify >> a bandpass filter around zero with a low cutoff of, say, -40e3 and a >> high cutoff of +40e3. However, this doesn't work -- the bandpass >> filter seems to require a number >0 for the lowpass frequency. > Make sure that you specify complex-taps. I assume you're using GRC. By > default, it uses the version of > the bandpass filter with real taps. But if you specify complex taps, > you can use negative frequencies. > > > -- > 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 _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
