[TenTec] Timewave 599ZX-Omni VI Opt 3

[Jim Brown K9YC]

On Mon, 26 Apr 2010 23:49:12 -0500, Duane Calvin wrote:

>ANC-4 along with the MFJ noise eliminator. 

Several thoughts. First, the concept is great -- for ONE noise source. If you 
have more, it won't help much. Second, the ANC-4 can be a very nasty key-
click generator. I used one in Chicago, and sometimes it helped, so I brought 
it with me to California. Soon after I moved in, I got a friendly call from 
my neighbor, who said I had clicks 5kHz away from my carrier. It took only a 
few minutes to figure out it was the sensing circuit for the carrier-operated 
relay. That was the end of the ANC-4 at this QTH, at least on the TX antenna. 

I've heard that the MFJ is nicer. It has the same limitations as the ANC-4 -- 
it only works on once source. 

I have used the ANC-4 on a dedicated RX antenna, also using a sense antenna, 
and that works without creating clicks. The noise cancelling concept is 
solid, but it has that fundamental limitation that you can only null one 
source at a time. Why? Simple -- cancellation can only occur with the two 
signals are equal in level and 180 degrees out of phase, and 99% of the time, 
it's only possible to do that for one noise source (or for multiple sources 
that were VERY close to each other). 

73,

Jim K9YC