On Tue, May 20, 2008 at 09:38:21PM -0400, Charles Swiger wrote: > On Tue, 2008-05-20 at 21:00 -0400, Brian Padalino wrote: > > On Tue, May 20, 2008 at 8:52 PM, Charles Swiger <[EMAIL PROTECTED]> wrote: > > > > > > gr_complex IQ = input * gr_complex(a_cos,-a_sin); > > > > > > which would be necessary to handle negative frequencies I think. > > > > > I don't know much about 8-VSB, but I was under the impression that > > it's a single sideband modulation scheme that benefits from being real > > only to avoid all the complex math associated with other modulation > > schemes. > > The issue turned out to be jiggering the numbers that say "I strongly > suggest that you not mess with these..." * by .707 for the bit timing > loop worked ;) > > We want a complex pll so it can take data directly from the usrp > centered on DC, w/o having to mix it up to 5.75e6 and converting to > real for the old fpll, which was just a trick to look like the old > mc4020 adc boards. > > --Chuck
Cool! Glad to hear that it's working. While you're at it, can you have it work with a sample rate of 8 MHz? As I recall, you're currently using something like 6.1 or such, which seems a bit narrow, given the roll off on the edges. Eric _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
