Re: [IRCA] [ABDX] KLTT-670 IBOC at night

["Neil Kazaross" <neilkaz@xxxxxxxxxxxxx>]

OK Craig, one more question concerning AM IBOC if you don't mind. So it is 
the adjacent KDKA that helps prevent good WBZ IBOC at night since it 
interferes with a sideband where the digital signal is. So, I ask, what is 
the long term plan for IBOC on AM, will it always exist in the current 
digital analog hybrid form, or will the analog be turned off and the digital 
signal put on channel so as to cause less interference ?

73 KAZ
----- Original Message ----- 
From: "Craig Healy" <bubba@xxxxxxxxxxxxxxxxxxxx>
To: "Mailing list for the International Radio Club of America" 
<irca@xxxxxxxxxxxxxxxx>
Sent: Friday, February 03, 2006 9:06 AM
Subject: Re: [IRCA] [ABDX] KLTT-670 IBOC at night


>> You live where WBZ is very strong ! WBZ IBOC gets chopped up by sunset
> skip
>> from other stations on 1030 ?!?!  WOW..since their really aren't (from my
>> recollection) many strong QRMing stations to WBZ in Providence (or
> Pawtucket
>> where I used to live).
>
> KDKA is the offender on WBZ, plus the destructive short-hop skywave.  WBZ
> interferes with itself.  I'm still living a bit over a mile from where you
> grew up.  That's maybe 35 or so miles from Hull where WBZ is. Pretty 
> limited
> coverage for a full Class A station.
>
>> WHAS is normally not overpowering in RI from my recollection, but one
> would
>> still expect to decode usable HD when the analog is strong and clear.
>
> 850 and 830 chew it up.  No way the HD sidebands can get through.
>
>> I fear the HD is simply the wrong approach for AM and will cause much 
>> more
>> harm than good (and I am not talking from a DXer's POV)
>
> I think many engineers are coming to that conclusion, but the inertia of 
> the
> iBiquity juggernaut is going to be tough to stop.  It is very interesting
> that full night IBOC hasn't been approved.
>
>> HD TV, is likely an improvement, and HD FM may be one..but HD AM.. ..I
> doubt
>> it.  73 KAZ
>
> I have an Accurian HDTV tuner, and my wife much prefers it to the analog
> tuner.  More choices, no ghosting.  FM has it's own problems that are
> similar to AM.  Wait until a lot of HD FM's are up and we get a good round
> of E skip or extended Tropo like in the spring.  Engineer's phones will be
> off the hook with complaints.  (sigh)
>
> I don't want to set off a whole 'nuther round of IBOC QRM, so I'll let 
> this
> drop from my end..
>
> Craig Healy
> Providence, RI
>
> 

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