Re: [IRCA] Tip for slight reduction of "I-block" interference

[George Sherman <georgesmn@xxxxxxxxx>]

Very interesting. Somwhat weak 4-8 kHz out, with the peaks at plus or minus 12.5 kHz being slightly stronger than the carrier frequency?! George S., MN

"W. Curt Deegan" <WWWR@xxxxxxxxxxxxx> wrote:
> George,
>
> I think you'll see why your observations make sense if you look at the IBOC 
> spectrum scans on my web site:
> http://ScooterHound.com/WWWR/radio/sefliboc.html
>
> The steep slope of the IBOC sidebands on the high side of the lower 
> sideband and low side of the higher sideband, is consistent with your use 
> of USB on the low side, etc.
>
> Curt
> -------
> W. Curt Deegan
> Boca Raton, (southeast) FL
>
>
> At 08:53 PM 3/5/2006, you wrote:
> >I did a little experiment. Some of you may already have discovered this. 
> >When I tried to receive adjacent to an "I-block" local, first I tried LSB 
> >on the low side &
>  USB on the high side. Didn't help a whole lot. Then for 
> >whatever reason I tried USB on the low side & LSB on the high side. The 
> >"I-block" interference was about 10db less! So it would seem that 
> >"I-block" sidebands are stronger beyond 10 kHz than within 10 kHz? Or is 
> >another explanation possible? I was using 2.3 kHz selectivity, if I 
> >remember correctly. Seems the "I-block" is really strong at about 14 kHz 
> >out (+ or -) , but then about gone at 15 kHz when using narrow 
> >selectivity. 73, George S., MN
>
>
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