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Re: [IRCA] All-Digital AM Co-Channel Lab Test Results Unveiled
Somewhere on an SD card I do have audio from the KRKO test. I'm in northeast
Seattle
I'll see if I can locate it and post it somewhere.
I can tell you, though, that there was enough HD hash on 1360 to make
listening unpleasant for the casual listener, and that doesn't normally
happen with KRKO's huybrid HD mode. It's possible that if I were nearer to
KRKO, the hash would have spread further.
And based on what I heard, I'd have to assume that 30-kHz between local
all-HD signals would be the minimum required, maybe 40.
--
Rick
-----Original Message-----
From: IRCA [mailto:irca-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Chuck Hutton
Sent: Thursday, April 21, 2016 10:04 PM
To: Mailing list for the International Radio Club of America
<irca@xxxxxxxxxxxxxxxx>
Subject: Re: [IRCA] All-Digital AM Co-Channel Lab Test Results Unveiled
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-re
>sults-unveiled/278670
>
>Sent from my iPad
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