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Re: Topband: DX Engineering NCC-2

To: "'N2TK, Tony'" <>, <>, <>
Subject: Re: Topband: DX Engineering NCC-2
From: "Tim Duffy" <>
Date: Tue, 5 Dec 2017 16:16:07 -0500
List-post: <>
Hello Tony

I use various antennas - to phase combine together with the DXE NCC.

For example, my favorite combination is on NCC Channel A with the three
element vertical Yagi and NCC Channel B is the HIZ 8 circle in phase with
the HIZ 4 square (5000 ft between them broadside on Europe). I also feed the
TopBeam Horizontal Waller Flag (at 160 feet) into the B receiver of the
IC-7851 (diversity). Sometimes I will use the pair of DX Loops (optimized
Flags) on NCC Channel A.

I use the NCC to phase combine antennas for increased receiving performance
to a target area (like Europe). The received noise is reduced due to the NCC
combining the antennas for maximum gain off the front of the combined
pattern. It is simple to get maximum peak performance using the NCC in this
fashion - just find a European station and use the NCC variable controls to
null him completely into the noise - then simply switch the B Phase switch
to Rev and you are on the peak. Turning the power on and off to the NCC will
verify the noise goes down and the Europe signals are improved.

Tim K3LR

-----Original Message-----
From: N2TK, Tony [] 
Sent: Tuesday, December 05, 2017 3:20 PM
Subject: RE: Topband: DX Engineering NCC-2

Hi Tim,
What do you use as a reference antenna as input  CH RX B to the NCC2? Do you
find one type of antenna works the best against local 60 HZ noise such as a
short vertical vs. a BOG vs. short Beverage vs. the transmit antenna?
N2TK, Tony

-----Original Message-----
From: Topband [] On Behalf Of Tim Duffy
Sent: Tuesday, November 28, 2017 12:54 PM
Subject: Re: Topband: DX Engineering NCC-2

Hello Bill:

Increased spacing might help your 160 meter performance. However with
multiple sources of local noise it may not be possible to get the results
you are looking for. The NCC-2 is very good when there is one source of
noise. It can produce very deep nulls and make a huge difference in being
able to hear signals.

There may also be some re-radiation of your noises from your top loaded 160
meter vertical - which will hurt a noise null as well.

I used the NCC with various receive antennas to work 83 countries last
weekend in the CQWW CW.

Here are a few videos of fighting RFI with the NCC2.

Tim K3LR

-----Original Message-----
From: Topband [] On Behalf Of Bill via
Sent: Tuesday, November 28, 2017 12:19 PM
Subject: Topband: DX Engineering NCC-2

I have the NCC-2 and 2 of the DX Engineering active verticals, the CQWW CW
was the first test drive. VERY impressive results on 40M, less so on 80M and
even less so on 160, compared to listening to the transmit antennas, an OCF
on 40/80 and top loaded vertical on 160. Just not much peaking or nulling of
signals found on 160M. The antennas are in a pine tree forest.
The noise is nonspecific, a constant S2 on 40, S4 on 80, and S5 on 160.
The neighborhood is lots of vacation cabins with a million possible noise

The question is: the spacing between the 2 active verticals is 50'. The
manual talks about spacing between 1/10 and 1/4 wavelength which is a big
variation when considering all 3 bands. Would an increase in spacing help on
160M? The ground rods were pounded into extremely rocky soil with a sledge
hammer and I can't get them out, so "experimenting" with the spacing would
require buying more ground rods :)

73, Bill KO7SS on Mt Lemmon in southern Arizona _________________ Topband
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