Topband: DX Engineering NCC-2

Tim Duffy k3lr at
Tue Nov 28 12:53:50 EST 2017

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 [mailto:topband-bounces at] On Behalf Of Bill via
Sent: Tuesday, November 28, 2017 12:19 PM
To: topband at
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
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