Chuck, I'm convinced that any incomplete transition to digital would be so chaotic, and the results so unacceptable for listeners, that it would be the last nail in the coffin for AM. First people would need a reason to convert to HD. The audio sounds so artificial that it's fatiguing. The hash is so overpowering that the interference levels would be far greater than anything our electronic landscape creates. Fortunately, it would take less of a signal for an HD station to lock, but non-HD stations would suffer greater interference. Unfortunately, neither KRKO nor the 1520 did their HD during the originally scheduled nighttime hours, so I never found out if their weaker signals locked into HD here. I would have been truly amazed if 1520's HD could have overcome the interference from Oregon (the Saturday reschedule would have been great, since Lake Oswego was weak, but equipment problems prevented the night test.) I suspect KRKO would have succeeded at night. Incidentally, the promos talked about how clear the stereo was going to be, etc., but the program sources for both stations was all mono, yes, even the music on 1520. And quite compressed, too. -- Rick
-----Original Message----- From: IRCA [mailto:irca-boun...@hard-core-dx.com] On Behalf Of Chuck Hutton Sent: Friday, April 22, 2016 9:55 AM To: Mailing list for the International Radio Club of America <irca@hard-core-dx.com> Subject: Re: [IRCA] All-Digital AM Co-Channel Lab Test Results Unveiled You can bet on that, as it would be impossible for each and every station to switch over at the same time. If the FCC mandates a switch to all digital, there would need to be a long time period for that to occur to allow transmission equipment equipment to be available, stations to buy the equipment as money is available, engineers to install and test the system, all sorts of sonsumer receivers to become available and for the public to buy receivers. If the FCC didn't mandate a switch and left it to market forces, expect the transition to never be complete. Chuck ________________________________________ From: IRCA <irca-boun...@hard-core-dx.com> on behalf of Russ Edmunds <wb2...@gmail.com> Sent: Friday, April 22, 2016 10:44 AM To: Mailing list for the International Radio Club of America Subject: Re: [IRCA] All-Digital AM Co-Channel Lab Test Results Unveiled If the intent were for all stations to go digital, then such a test would be meaningless; this suggests therefore that there is contemplation of mixing all digital with analog all within the AM band ?? Russ Edmunds 15 mi NW Phila Grid FN20id <wb2...@gmail.com> AM: Modified Sony ICF2010's (2) barefoot w/whip FM: Yamaha T-80 & T-85, each w/ Conrad RDS Decoder; Onkyo T-450RDS; Tecsun PL-310 ( 2); modified Sony ICF2010 w/APS9B @ 15'; Grundig G8 w/whip; modified Sony ICF2010 w/whip On Fri, Apr 22, 2016 at 1:03 AM, Chuck Hutton <charle...@msn.com> wrote: > Yes, desired to undesired is often-used nomenclature in the > communications world. > > I don't see how you can correlate hybrid IBOC to all digital IBOC. > What you hear with KRKO/KAST is different from what you will hear with > all digital as the power spectrum and subcarrier levels are vastly > different. > > Chuck > ________________________________________ > From: IRCA <irca-boun...@hard-core-dx.com> on behalf of Nick > Hall-Patch < n...@ieee.org> > Sent: Friday, April 22, 2016 4:51 AM > To: Mailing list for the International Radio Club of America > Subject: Re: [IRCA] All-Digital AM Co-Channel Lab Test Results > Unveiled > > I presume "D/U" abbreviation in this piece refers to "desired / undesired"? > > I wonder if someone recorded audio from those tests, rather than just > tossing dB's around? I have a recording of KAST-1370 from this > morning that says otherwise, with KRKO-1380 IBOC sidebands about 25dB > down and....welll, KAST is readable, but I wouldn't say it's lacking > interference. The noise becomes really dominant if KAST is less > than ~15dB above the IBOC level. > > best wishes, > > Nick > > > > > At 21:05 21-04-16, you wrote: > > > http://www.radioworld.com/article/all-digital-am-co-channel-lab-test-r > esults-unveiled/278670 > > > >Sent from my iPad > >_______________________________________________ > >IRCA mailing list > >IRCA@hard-core-dx.com > >http://montreal.kotalampi.com/mailman/listinfo/irca > > > >Be sure to register now for the Joint DX Convention Kansas City, > >September 9 to 11. Hotel space is filling up. > >Registration info: > >http://www.nrcdxas.org > > > > > >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: irca@hard-core-dx.com > > > _______________________________________________ > IRCA mailing list > IRCA@hard-core-dx.com > http://montreal.kotalampi.com/mailman/listinfo/irca > > Be sure to register now for the Joint DX Convention Kansas City, > September 9 to 11. Hotel space is filling up. > Registration info: > http://www.nrcdxas.org > > > 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: irca@hard-core-dx.com > > _______________________________________________ > IRCA mailing list > IRCA@hard-core-dx.com > http://montreal.kotalampi.com/mailman/listinfo/irca > > Be sure to register now for the Joint DX Convention Kansas City, > September 9 to 11. 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Registration info: http://www.nrcdxas.org 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: irca@hard-core-dx.com _______________________________________________ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Be sure to register now for the Joint DX Convention Kansas City, September 9 to 11. Hotel space is filling up. Registration info: http://www.nrcdxas.org 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: irca@hard-core-dx.com