also any sites that might have had there elevator upgraded or new elevator .
The motor controllers (pwm) or VFD's throw out amazing wide band spread
spectrum noise easily s9 for amazing distances.
my build has them s9 all over 1-30mhz
ml
n2ehg
On Apr 28, 2014, at 6:07 PM, Lee K7TJR <k7tjr@msn.com> wrote:
>
> Ken,
> You might look around your neighborhood for a new installation of a
> water pump,
> sewer pump or any facility using a large electric motor. These modern VFD
> motor drives are
> killer on wideband noise when they are not filtered. They are fairly easy
> to find with
> a BCB radio. I have successfully dealt with one and have another in progress
> waiting to
> inform the company. First one was 1.5 miles away. If you hear it on 15
> meters it cant be
> too far away
> Lee K7TJR OR
>
>
>
>> Yes. I had wondered about that too.
>
> However, I hear it on my small battery powered Radio Shack AM/FM/SW radio
> too.
>
> Also, other hams in this area, out to as much as 5 miles in radius from
> here, are reporting hearing the same thing.
>
> I'm going to switch to a TS-940 to see if there is a difference in what I am
> hearing.
>
> I doubt if there will be.
>
> The noise is also very loud on 15 meters.
>
> Ken W7EKB
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