emotions...so, some words to clear up the issue: Of course, i
am also a fan of analog transmission (and the well built vintage
radios associated with it - otherwise i would not be here),
anyhow: technology is progressing, and, hopefully, the advantage
in digitizing AM-radio transmission is not only falling into
the hands of the money makers (by the way: besides the modula-
tor itself it should be possible to also use existing analog
AM-transmitters - even the very small and local ones - for di-
gital QAM-based transmission modes...so, maybe the financial
efforts are not too big...). And, to meet the topic of this
forum: i'm currently in the development and design of an IF-
downconverter to the digital radio final IF of 12[kHz], that
is able to produce a clean signal with constant group delay
out of either the 5.645[MHz] or the 50[kHz] IF of the Drake
gear, that we all love...anyone interested in the results
sooner or later?
vy73 de DG7MCC, Herbert Schulz
Greg Putrich schrieb:
I believe you're correct. According to some searching, IBOC was rolled
out to a handful of markets, including Chicago.Here's a link that talks about the Chicago stations a bit.
http://antiqueradios.com/forums/Forum5/HTML/001776.htmlMore info on IBOC:
http://www.ibiquity.com/Greg
Herbert Schulz said:
> I'm not an US-citizen, so my following statement is a wild guess,
> anyhow: Maybe this signal is not an interference, but a transmis-
> sion of the emerging, new AM-broadcast mode called "DRM" (Digital
> Radio Mondiale) which uses QAM32 or QAM64 as a modulation method
> and delivers crystal-clear audio, which is close to FM-hifi-qua-
> lity - in some cases (at least here in Europe) even in stereo. If
> that is a transmission of that kind, i would suggest to listen to
> it (a IF-downconverter to a final IF of 12[kHz] and a PC with sound-
> blaster and demodulator software is needed) - the audio quality will
> for sure surprise anybody. Those transmissions could be easily identi-
> fied, because they have sharp bandwith limits: 10[kHz] (+/-5[kHz] at
> shortwave and 9[kHz] (+/-4.5[kHz]) at medium wave (AM) and long
> wave.
>
> vy73 de DG7MCC, Herbert Schulz
>
>
>
>
>
>
> DAN COTSIRILOS schrieb:
>
> > Has anyone else in the Chicago area noticed the digital signal on both
> > sides of WIND 560? If that is the kind of interference that broadband
> > is going to make uh oh!!!! Dan
>--
