There are many improvements and changes to the NCC-2 vs. the NCC-1. If you
are thinking about an NCC-2 for your shack I suggest you look here:
https://www.dxengineering.com/parts/dxe-ncc-2
The specifications rate the unit to 30 MHz. The reviews and documentation
are worth looking at as well.
AA1K uses SIX NCC units at his 160 station. W0FLS and other topband DXers
use the NCC.
I have been using the NCC-1 and it's improved version NCC-2 (yes the null is
better) for a very long time. I use the NCC-2 to phase two RX antennas for
improved performance. I have worked some outstanding DX on 160 that would
not be possible without the NCC-2.
73
Tim K3LR
CEO DX Engineering
-----Original Message-----
From: Topband [mailto:topband-bounces+k3lr=k3lr.com@contesting.com] On
Behalf Of Jim Brown
Sent: Monday, December 23, 2024 12:38 PM
To: topband@contesting.com
Subject: Re: Topband: NCC-2 NCC-1
On 12/23/2024 6:07 AM, Andree DL8LAS via Topband wrote:
> Hey,do any of you use an NCC-2 or NCC-1 for antenna phasing or noise
reduction?
Hi Andy,
I own two NCC-1 units (the second is a spare). It is my understanding
that the NCC-2 differs only in the switching, providing for the main TX
antenna to be used as one of the antennas. The phase shift it provides
is most effective below 40M.
I made extensive measurements of my first NCC-1 as part of the research
for my applications note on phasing a pair of VE3DO loops. It's on my
website, k9yc.com/publish.htm I have a pair of the loops spaced 5/8
wave, aimed to EU, my most difficult direction, and confirmed, listening
to the known headings to various stations, that it worked exactly as
careful EZNEC modeling predicted.
Usefulness for noise cancellation is much trickier, depending entirely
on the number of sources, their azimuth to you and antennas you can use
for sensing and listening, and the physical breadth of the source. The
whole practice of nulling a source is effective for a single azimuth
heading at a time, and for sources whose radiating antennas (the wires
connected to them) are small as a fraction of a wavelength. I've had
little success with noise cancellation, thanks to the number and their
azimuthal dispersion, but this is entirely dependent on our own
individual situation.
BTW -- I had to measure the unit I bought to learn anything about it,
and did that work in 2017. When I asked DXE a year or two earlier prior
to purchase if it would be effective at 50 MHz, they didn't know.
73, Jim K9YC
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