Topband: BCB interference ?

[Chuck Hutton]

> Date: Mon, 22 Sep 2014 11:21:29 -0700
> From: jim at audiosystemsgroup.com
> To: topband at contesting.com
> Subject: Re: Topband: BCB interference ?
> 
> On Mon,9/22/2014 6:50 AM, Ed Stallman wrote:

> >  I found I have a 25KW AM 1520 Khz BC transmitter 12 miles from me , 
> > is that close enough to interfere with me receiving weak signal DX on 
> > the top Band ? I do hear some wide band hash 1837 to 1840 !
And Jim Brown wrote:
> That may be because they are transmitting digital radio. No filter will 
> remove that -- it's part of their sidebands.
> 
> 73, Jim K9YC
 Jim: Digital sidebands for AM stations only extend +/- 15 kHz from the carrier. If noise is being heard 317 kHz above the carrier, it's not due to IBOC usage. Chuck