--- Andrea Lawendel <[EMAIL PROTECTED]> wrote: > 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.
*** Pretty much correct. What we have with IBOC is a hybrid mode where the analog signal occpies the portion of the spectrum it always did, and the digital signal occupies two bands on either side, which significantly increases the total bandwidth. DRM as you have it in Europe contains only the digital signal - no double sidebands - so it occupies less bandwidth. Russ Edmunds Blue Bell, PA ( 360' ASL ) [15 mi NNW of Philadelphia] 40:08:45N; 75:16:04W, Grid FN20id <[EMAIL PROTECTED]> FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15' AM: Hammarlund HQ-150 & 4' FET air core loop ____________________________________________________________________________________ 8:00? 8:25? 8:40? Find a flick in no time with the Yahoo! Search movie showtime shortcut. http://tools.search.yahoo.com/shortcuts/#news _______________________________________________ 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]
