I use the MFJ-1025 (similar to the NCC-1) with my SAL-20. In my case I use my
TX antenna as the sense input. My xcvr (FTdx5000) internally feeds the
TX antenna to an
output connector while in receive. So I just feed that signal to the
MFJ-1025. Works
great on local powerline buzz as well as switching PS noise that may drift into
my receive BW. On 80m my TX antenna is a 4sq and on 160m it's a vertical.
Re: SAL pattern. The null is at 180 degrees if you have the delay line
and couplers
configured right. See the users manual and 4nec2 model. But this is
more appropriate
fodder for the sharedapexloop yahoo forum.
73,
Kris N5KM
-------------------------- original message
----------------------------------------------------------
Date: Sun, 20 Dec 2015 08:09:43 -0800
From: "Richard (Rick) Karlquist" <richard@karlquist.com>
To: Rune ?ye <runeegil@hotmail.com>, "topband@contesting.com"
<topband@contesting.com>
Subject: Re: Topband: DX Engineering NCC-1 phase controller
Message-ID: <5676D2C7.3050306@karlquist.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
On 12/19/2015 11:46 PM, Rune ?ye wrote:
> a NCC-1 from Dx Engeneering. My plan is to use this
with my SAL30 RX array on antenna port A and
> 73 Rune LA7THA
This isn't an answer to your question, but a
more straightforward way to accomplish what I
think you are trying to do would be to make an
array of two loops, where the azimuth of the
individual loops can be chosen so that they
null out the single point noise source that
you are trying to null out with the NCC-1.
The azimuth of the array can then be chosen
to enhance in the direction of the signal you
want to receive. IOW, the orientation of
the loops is independent of the orientation
of the array.
The trouble with the SAL is that the null
of the loops is always at a 90 degree angle
to the angle of reception. You can't choose
the angle. The other trouble with the SAL
is that the spacing between the loops is
always very small, and you can't choose that
either. If you increase the spacing, it
isn't a SAL any more, it's just ordinary loops
in phase.
Rick N6RK
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