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Re: [IRCA] All-Digital AM Co-Channel Lab Test Results Unveiled
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-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Chuck Hutton
Sent: Friday, April 22, 2016 9:55 AM
To: Mailing list for the International Radio Club of America
<irca@xxxxxxxxxxxxxxxx>
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-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-r
> esults-unveiled/278670
> >
> >Sent from my iPad
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