Does anyone have any information on receivers that will be available to
monitor this mode? I didn't think AM really had a future with it either
being all talk or religion and sports and sometimes Spanish. I'm a bit
surprised too that some music stations that are on AM such as CFCO from
Chatham Ont, and CHOK from Sarnia haven't started using this, but there are
a few stations in my area that are using IBOC.
----- Original Message -----
From: "Lloyd Rasmussen" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, March 21, 2005 7:29 PM
Subject: Re: IBOC AM question
> IBOC stands for "in-band, On-channel" and is a way to hide digital
> transmission inside an analog signal. The "Digital Radio Mondiale"
> which you hear on some frequencies on shortwave, including 3995 KHz
> from Germany at night, is an all-digital broadcasting system.
>
> I don't know the details of IBOC on FM. I can tell you about it on
> AM, because WTOP, 1500 KHz is now running this mode during daytime
> hours. Part of the digital information sounds like white noise 30 or
> 40 dB below the modulation, spread over the plus/minus 10 KHz region
> from the carrier frequency. Then there is a stronger digital signal
> between plus/minus 10 and plus/minus 15 KHz of the carrier.
> Effectively, during the day, WTOP now occupies the spectrum from 1485
> to 1505 KHz. And even though I should have a "full quieting" signal,
> being 1 mile from the 50 KW transmitter, it sounds like I'm 20 miles
> away because of the added on-channel noise. I think IBOC is a bad
> idea, at least on AM, but supposedly it can sound as good as FM.
>
>
> On Mon, 21 Mar 2005 09:57:07 -0500, Lowell Miller wrote:
>
>>O.K. What is iboc?
>>I must not be on the cutting edge!
>>73
>>Lowell W8QIY
>>----- Original Message -----
>>From: "Jeff Kenyon" <[log in to unmask]>
>>To: <[log in to unmask]>
>>Sent: Sunday, March 20, 2005 5:31 PM
>>Subject: IBOC AM question
>>
>>
>>> Hi everyone, I have been hearing a few things here and there about IBOC
>>> digital on AM and some short-wave stuff, and I have a few stations
>>> around
>>> the Detroit area that I think are using the IBOC. This includes WWJ and
>>> WCHB 1200 and our family life station WUFL, 1030. Has anyone used a
>>> receiver that will work with IBOC and what have your opinions been and
>>> do
>>> you all have any suggestions as to what to invest in?
>
> Some people think that the devil is in the details. Actually, God is in
> the details.
> Lloyd Rasmussen, Kensington, Maryland
> home: <http://lras.home.sprynet.com/>
> Work: <http://www.loc.gov/nls/z3986>
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