Topband: Boradband noise on 160 meters tracked down to apartment complex

[Don Kirk]

Mfj Nuller will not work because the signal is in the same direction of my
300 deg pointing pennant.

My guess is that we should be able filter and shield properly at the source

Don
On Sunday, December 14, 2014, W2PM via Topband <topband at contesting.com
<javascript:_e(%7B%7D,'cvml','topband at contesting.com');>> wrote:

> Sounds like a job for the MFJ nuller. The good news being its a point
> source and should be easily handled. It may cost you several months of
> frustration for no good outcome otherwise but perhaps it's worth a try if
> there is a simple bonding issue there.
>
> Sent from my iPad
>
> > On Dec 14, 2014, at 01:08, Jim Brown <jim at audiosystemsgroup.com> wrote:
> >
> >> On Sat,12/13/2014 5:35 PM, Don Kirk wrote:
> >> Now going back to the contractor that installed the equipment in an
> attempt
> >> to better understand the hardware in the unit
> >
> > That smells like a Variable Speed Drive, the heart of which is a
> switching power supply that generates pulses in the 10 kHz range, the width
> of which are varied to control the speed of the motor. Lots to go wrong
> here -- switching power supply, square pulses of big current running a
> distance between the controller and the motor, often with supply and return
> conductors widely separated from each other, and with controller and motor
> widely separated, so the current flows in a large loop. Can you say train
> wreck?
> >
> > 73, Jim K9YC
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