I *think* that AM analog and IBOC are piggybacked. AM IBOC has made 1000-1200 KHz a bunch of noise, for me.
IBOC making FM MS DX'ing easier? IBOC? I wouldn't think so. First, they don't use IBOC in Europe, AFAIK. DAB, maybe. RDS (analog) and the RDS that are carried with digital signals may indeed make MS (or tropo scatter) loggings easier. The Sangean HDT1 has (from what I'm told) a fast RDS capture ratio. Instead of trying to figure out where an eight second meteor sctter burst is from by listening to "that was five in a row on today's best...." versus simnply having "KHFI Austin's best" displaying on the readout makes FM DX'ing MUCH easier! Dave ------------------------------ Message: 9 Date: Fri, 15 Aug 2008 12:27:48 -0600 From: "CHRIS KNIGHT" <[EMAIL PROTECTED]> Subject: Re: [IRCA] Skywave noise To: irca@hard-core-dx.com Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; format=flowed Dave, Thanks for the response! Do you (or anyone else) know if AM IBOC is transmitted along with the analog signal and the sidebands 25kHz away from the center carrier frequency simply result from the modulated carrier? Or, are the digital channels transmitted separately from the carrier? Just curious. I know IBOC is being called "hybrid" (analog and digital). Also, there was something about British AM stations being mandated to go "all digital" by a certain year. I wonder if they meant "IBOC"? Just trying to get a handle on all of this... There are some great Youtube videos of a European DXer in Ireland that uses what appears to be IBOC to aid in ID'ing FM BCB stations coming in via meteor scatter. In that case, IBOC made meteor scatter DXing much easier. As far as AM IBOC, DXers could be missing out on a real opportunity. Each AM IBOC "channel" is on a pretty clear frequency 25kHz on either side from the carrier center frequency. Not too many stations currently have IBOC so co-channel QRM on the IBOC sidebands is still minimal. Wouldn't it be possible to design a decent receiver with great filtering that only picked up these digital signals and DX these newest "clear" channels, propagation permitting? Just a thought.... Re. TV DX I really had no clue other than certain DXers saying "last chance to get in on the E-skip action". I guess the whole reason (or one of the reasons) behind transitioning to digital in Feb. 2009 would be to free up bandwidth (isn't current TV bandwidth/channel something like 6MHz?). So, I wonder how much bandwidth this move will actually free up. Agreed that the AM BCB was never meant to have IBOC or any baseband signals over 20kHz. To accomodate IBOC with the number of channels it now has, the AM band would need to be increased to about 4MHz. With the IBOC and the BPL (Broadband over powerlines) decisions, the FCC isn't coming across as an entity with very much integrity. 73. Chris Knight Fort Lupton, Colorado >From: "HASCALL, DAVID CIV DFAS" <[EMAIL PROTECTED]> >To: <irca@hard-core-dx.com>, <[EMAIL PROTECTED]> >Subject: RE: Skywave noise >Date: Fri, 15 Aug 2008 13:35:22 -0400 > >Chris; > >Not sure about ham induced TVI on the DTV's but TV DX'ing is not going >to die that easy, just because of the Transition. > >In fact, DTV TV DX'ing is happening now. There are some low band DTV >stations and these ARE DX-able via Es. Several were reported this year. >Girard Westerberg was the first (IIRC) to log a DTV via Es back in 2005, >I think. Since many DTV's are UHF, tropo is big with those. Jeff >Kadet, in WC Illinois had the Texas Panhandle DTV's in a few weeks ago, >600+ miles. He also had analog UHF translators, which are uneffected by >the mandate to go to digital. Also after the transition, open chanbnels >2-6 may allow interesting loggings of Central and South American TV >stations and those in the Carribean. > >FM IBOC is also being DX'ed. I caught an HD signal on 96.7 from Austin >TX, via Es, in June. That reception was over a semi-local. The HD >radios offer great analog FM sections as well as the digital. I bought >an Accurian HD radio @ Goodwill for $6 and I can hear stations on 97.7 >against a strong analog on 97.9. Thanks DSP! > >Digital on AM BCB? It's there - IBOC and the noise is everywhere. >Nighttime IBOC is an absolute waste and as Craig Healy pointed out it >will not work in some applications. > >73, >Dave in Indy > > >------------------------------ > >Message: 5 >Date: Thu, 14 Aug 2008 15:10:44 -0600 >From: "CHRIS KNIGHT" <[EMAIL PROTECTED]> >Subject: Re: [IRCA] Skywave noise >To: irca@hard-core-dx.com >Message-ID: <[EMAIL PROTECTED]> >Content-Type: text/plain; format=flowed > >This brings to mind some questions: When TV stations switch from analog >to >digital in Feb 2009, will that mean ham radio will no longer QRM TV >stations? Since the modulation/video mode will be digital will this mean >the >end of DXing TV on tropo, E-skip modes, etc.? Will digital ever be >implemented for AM BCB? If so, what impact will it have on DXing? 73s. > >Chris Knight >Fort Lupton, Colorado > > > >From: Mike McKenna <[EMAIL PROTECTED]> > >Reply-To: Mailing list for the International Radio Club of > >America<irca@hard-core-dx.com> > >To: Mailing list for the International Radio Club of > >America<irca@hard-core-dx.com> > >Subject: Re: [IRCA] Skywave noise > >Date: Thu, 14 Aug 2008 13:40:36 -0700 (PDT) > > > >I agree with Kieth. I support the idea that TV channels 5 and 6 should >be > >transfered over to the FM radio service. I would also suggest that TV > >channels 2, 3 and 4 be allocated to the FM band --if possible. > _______________________________________________ IRCA mailing list IRCA@hard-core-dx.com 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: irca@hard-core-dx.com