Keep in mind this only works if noise is from one source, at least that 
was my experience when I lived in Las Vegas.  I had terrible power line 
noise, but it came from all over, so the thing didn't work for me at 
all.
73
Butch
WA0VJR
Node 3148
Wallace, ks.


On Thu, 15 Oct 2015, Eric Oyen wrote:

> its fairly effective against single phased sources (like powerline buzz =
> and other stationary noise sources). It is the unamplified version and =
> does introduce a little signal loss. However, for what it is, it works =
> good enough that I can do weak signal work on 80m.
>
> Now,as for what it is:
> the mfj antenna noise cancellation device is basically a diversity =
> antenna matrix. It takes signals from both the primary antenna and a =
> secondary (noise) antenna. It then mixes (or phases) those inputs such =
> that (when properly adjusted) the noise disappears while leaving the =
> signals you want intact. This technology predates DSP technology and is =
> still very useful. In fact, in combination with DSP technology, noise =
> can almost entirely be eliminated.
>
> DE n7zzt Eric
>
> On Oct 15, 2015, at 2:01 PM, Mike Keithley wrote:
>
>> How effective is the MFJ-1025 noise canceler? What is it?
>> =20
>> Thanks.
>
>