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

[Russ Edmunds <wb2bjh@xxxxxxxxx>]

I would anticipate that the larger potential interference problems will be
when stations on the same channel are some digital and some analog,
but the interference, I strongly suspect would be from the analog
interfering with the digital due to the wider bandwidth and/or propagation.

Russ Edmunds
15 mi NW Phila
Grid FN20id
<wb2bjh@xxxxxxxxx>

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 12:54 PM, Chuck Hutton <charlesh3@xxxxxxx> wrote:

> 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-bounces@xxxxxxxxxxxxxxxx> on behalf of Russ Edmunds <
> wb2bjh@xxxxxxxxx>
> 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
> <wb2bjh@xxxxxxxxx>
>
> 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 <charlesh3@xxxxxxx> 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-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-test-results-unveiled/278670
> > >
> > >Sent from my iPad
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