[BC] IBOC Tentatively Identified as Interfering Signal

[Mike McCarthy]

Kent,

First adjacents are the ones at most risk of being BOMBED.  This is 
especially acute in the 1230/1240 local stations where there are a LOT of 
overlaps nearing 5mV.  If both locals light up with IBOC, it will be mutual 
and absolute annihilation.  IX will be present up to the 10mV 
contour...which on those stations is only about 5 miles in good soil.  If 
many light up around the country, those two channels (as well as 1220 and 
1250) will be nothing but mush/hash.

I don't know if you caught Greg Buckwald's presentation at Madison last 
year about pattern bandwidth and problems with first adjacents.  He used 
WTMJ as an example.  In certain areas, the IBOC to analog carrier ratio was 
10dB OVER what the standard defines.  In very few areas was the ratio under 
the standard.

MM

At 04:36 PM 8/14/2006 -0400, Kent Winrich wrote
>Trust me.  My AMs are in sand.  I am familiar with the ground conductivity
>(and having just came from the fertile ground of the Midwest).  But my point
>was if this has nothing to do with IBOC.  The ground is what it is.  We
>learn to deal with what is delt to us.
>
>In regards to the interference issuse, again I will refer to 680/700/720 in
>Chicago/Cincy .  70 miles NORTH of Chicago I am able to get WLW during the
>day while WSCR and WGN run IBOC (WGN has IBOC turned off as of this
>writing).  WLW is over 400 miles away.  I haev not had any difference in my
>ability to receive WLW.  In Milwaukee WTMJ is running IBOC.  In the main
>lobe of 620 WTMJ, (250kW ERP) I am able to get tiny 640 WMFN, 1.2 kW in
>Zeeland, MI (about 80 miles away).  What am I missing?
>
>
>On 8/14/06, Powell E. Way III W4OPW <w4opw at yahoo.com> wrote:
>>
>>
>>
>>--- Kent Winrich <kwinrich at gmail.com> wrote:
>>
>> > Come on, arent you overblowing this a tad?
>>
>>No, he's not down here.
>>
>>
>>Powell in land of way less than 1 conductivity
>>Columbia SC
>>
>>w4opw at americanbroadcastdx.com
>>NNNN!
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