On Thu, Apr 7, 2011 at 1:24 PM, Jim Brown <jim@audiosystemsgroup.com> wrote:
> On 4/7/2011 9:26 AM, TexasRF@aol.com wrote:
> > I guess I am wondering how much of the 160m QRM is cross mod vs radio
> > station harmonics.
> >
>
> Good question. When I lived in Chicago, I heard occasional mixes that
> I'm pretty sure were NOT generated at any of the stations involved.
> They came and went as if switched at random times, and not at times that
> corresponded to pattern or power changes.
I had a mix on 1830kHz that would FADE in and out sometimes. One night that
it was particularly clear I figured out was that it was CHU on 3330 mixing
with a loud local on 1500kHz. That explained the fading.
At some point a couple years ago it started to BURST in and out and became a
real problem. That's when I discovered the source: the nonlinear element
was the bearings in a little TV rotor I was using to turn a lightweight mast
with one of my Moxons on it. THe mast wasn't too far from my flag. I
strapped around the rotor and it went away.
73
Dan
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