Re: [IRCA] All-Digital AM Co-Channel Lab Test Results Unveiled

[Nick Hall-Patch <nhp@xxxxxxxx>]

It's quite easy to correlate Chuck.  Just add ignorance and stir.  I 
don't believe they actually said anything much about the digital 
signal, so assumption of all digital IBOC can reasonably be added to 
that mix.  (other details about demodulation of the analog signal are 
also missing)

Audio examples would be nice, and might help to convince the doubters.

http://www.radiomagonline.com/deep-dig/0005/broadcast-engineering-conference-radio-technology-forum-sessions/37600 
offers descriptions of the conference sessions, but I haven't been 
able to quickly track down any more detailed results than what Dennis 
linked to.

http://diymedia.net/old/stuff/AM_IBOC_Test.pdf  has a nice graphic on 
the first page which I assume is what Chuck is alluding to in terms 
of the difference  between present IBOC and all-digital IBOC.   Is 
that the case Chuck?  If so, perhaps you could suggest a listening 
test that could be done with today's systems (thereby saving me the 
trouble of doing it incorrectly)?   Those secondary OFDM subcarriers 
already sound pretty nasty on KRKO's signal this morning, and they 
would be stronger in the digital only version.

best wishes,

Nick






At 05:03 22-04-16, you wrote:
> ...
>
> 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-bounces@xxxxxxxxxxxxxxxx> on behalf of Nick 
> Hall-Patch <nhp@xxxxxxxx>
> 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-tes 
> t-results-unveiled/278670
> >
> >Sent from my iPad
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