Topband: Boradband noise on 160 meters tracked down to apartmentcomplex

[Tom W8JI]

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

There are a lot of popular misconceptions about this. The noise does always 
not have to be a different direction, or even just one source.

The MFJ nuller and other similar systems will remove noise when:

1.) The sense antenna is much closer to the noise, or picks up the noise 
much better compared to signals than the listening antenna does. This is 
true no matter what the desired signal direction. In this case you are 
eliminating a source by having a sense antenna hear the noise much stronger 
than the sense antenna hears desired signals.

2.) The noise is one or multiple sources from the same direction and the 
sense antenna is reasonably close to the RX antenna and the correct 
direction from the RX antenna. The noise has to be a significantly different 
direction than the RX direction. You are just eliminating the general noise 
direction in this case.

3.) The noise can be from multiple sources radiating from the same point. A 
long power line with multiple insulators arcing that is passing by close, 
and conducting emissions to that point,  might be an example. You are 
nulling the point of coupling, rather than the noise generator's location.