On 3/23/07, Paul Crankshaw <[EMAIL PROTECTED]> wrote: > > Here in Europe there are a few DRM stations which I presume are the > equivalent of IBOC.
Paul, I believe IBOC it's even worse. DRM as pure digital modulation maintains a spectral occupancy of 9 kHz, which is bad in cases like the one you're referring to. If I'm not mistaken, IBOC being a hybrid mode, it adds 10 kHz of digital modulations to each 5 kHz of analogue sidebands, for a total occupancy of 30 kHz. Digital side bands have lower power, but I can assure their effect in the daytime is huge. I've experienced IBOC only once last year, waiting for a connecting flight in Newark, it was on 1280 from NY (what was that, a Hispanic, WADO?). The digital hash spilled over at least two channels on each side of the tuned frequency. When I compare that to RAI's DRM local test in Siziano, some 30 kilometers south of Milan, on 693 kHz, my situation here sounds slightly better, at least I'm, not losing two side channels on each flank, even with wide filters. I hope Scott's considerations will prove sound as they certainly look at present. 73s Andy _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: [email protected]
