Re: [IRCA] Update on WGN IBOC interference

["Neil Kazaross" <neilkaz@xxxxxxxxxxxxx>]

WBZ IBOC was legally on until 5 PM CST the last couple of years and hammered 
KDKA here in IL from about 3:30 PM(earlier in Dec) CST to 5 PM (IBOC shut 
off) during Nov to early Feb.

73 KAZ home from travelling and sending you the DXE phaser tomorrow

----- Original Message ----- 
From: "Craig Healy" <bubba@xxxxxxxxxxxxxxxxxxxx>
To: "Mailing list for the International Radio Club of America" 
<irca@xxxxxxxxxxxxxxxx>
Sent: Friday, October 12, 2007 12:55 AM
Subject: Re: [IRCA] Update on WGN IBOC interference


>I would like to add something to my previous post..
>
> In many cases, skywave interference near sunrise and sunset has been
> regulated.  This is called Critical Hours power.  Often it'a rather small
> fraction of the mid-day power.  1800w down to 1kw, or 10kw down to 2.5kw 
> as
> a couple of examples that come to mind.  IBOC carriers should also have to
> follow this guideline.  When an allocation study requires it, full IBOC
> power should not be allowed until two hours after sunrise, and lowered two
> hours before sunset.  The lower of the two powers, depending on the
> allocation, should be the limit for both sidebands.
>
> All this is just more evidence as to why AM IBOC should never have been
> permitted, and why it will cause irreparable harm if allowed to continue.
> Were I KDKA or WYSL, I would not be looking forward to December when the 
> WBZ
> IBOC will come barreling in during their drive times.  It will certainly
> have an effect on their listenership and their bottom line.  Sad..
>
> Craig Healy
> Providence, RI
>
>
>

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