Topband: Topband NOISE CANCELLERS

[Tim Duffy]

Hello Steve!

The DX Engineering NCC-1 works very well with the K3. However it does not
use the diversity reception option of the K3 - as all of the antenna
combining and phasing is done in the DXE NCC-1 to allow signals appear out
of the noise. 

The K3 diversity (two RX and two antennas) cannot "phase" two RX antennas to
allow/combine for signal enhancement (or noise reduction) the same way the
DX Engineering NCC-1 does.

Hope this helps.

73,
Tim K3LR

-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of
nn4t at comcast.net
Sent: Sunday, November 17, 2013 6:05 PM
To: k3lr at k3lr.com
Cc: Marcelo Chrispin; topband at contesting.com; Tom W8JI; HAROLD SMITH JR;
Robert L' 'Chortek; Jon Zaimes AA1K; carsten esch
Subject: Re: Topband: Topband NOISE CANCELLERS


Tim. How does a device such as the NCC-1 work with diversity reception on
the K3? Is it useful there or superfluous? 
----- Original Message -----

From: "Tim Duffy" <k3lr at k3lr.com> 
To: "Marcelo Chrispin" <marcelo at ultracyber.com.br>, "Tom W8JI"
<w8ji at w8ji.com> 
Cc: "HAROLD SMITH JR" <w0rihps at sbcglobal.net>, topband at contesting.com, "Jon
Zaimes AA1K" <jz73 at verizon.net>, "Robert L' 'Chortek"
<Robert.Chortek at berliner.com>, "carsten esch" <carsten.esch at appello.de> 
Sent: Sunday, November 17, 2013 3:01:54 PM 
Subject: Re: Topband: Topband  NOISE CANCELLERS 

Hello Marcelo, 

Roger on thanking Tom, W8JI! 

Tom designed the MFJ-1025 and the DX Engineering NCC-1. 

Both MAJOR contributions - helping us to enjoy our Low Band hobby! 

73, 
Tim K3LR 

-----Original Message----- 
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Marcelo 
Chrispin 
Sent: Sunday, November 17, 2013 3:50 PM 
To: 'Tom W8JI' 
Cc: 'ZR'; topband at contesting.com; 'Jon Zaimes AA1K'; 'HAROLD SMITH JR'; 
'Chortek,Robert L'; 'Tim Duffy'; carsten.esch at appello.de 
Subject: Topband: RES: NOISE CANCELLERS 

Mr. Tom - W8JI 

Et.  All Top Band guys. 

  

Mr. Tom, is a great honor for me to receive your comments. 

I'm sure everyone thinks like me. 

I also want to thank all those who are interested in this subject, and 
further development of the technique of noise cancellation in the Top Band. 

Any hint is very welcome. 

I really appreciate yours comments and yours attentions. 

VY73 

  

Marcelo Chrispin - PY5MC 

Araucaria DX Group 

CWJF 

De: Carsten Esch [mailto:carsten.esch at appello.de] 
Enviada em: domingo, 17 de novembro de 2013 07:55 
Para: Tom W8JI; Marcelo Chrispin; topband at contesting.com 
Assunto: Re: Topband: NOISE CANCELLERS 

  

... I would like to try the DXE NCC-1 too (have one sitting here) to fight 
some noise on 80/160m ... 

I have a Hi-Z 8-circle for RX, TX antenna is a matched tower ... 

The DXE manual says: 
---- 

"The NCC generally works best when both antennas have similar patterns, 
polarization, and S/N 

ratios. You may have to experiment to find the best antenna, but successful 
operation occurs more 

often with similar antennas. 

Use with Beverage or Other Low Noise Antennas 

The NCC-1is probably most useful when used to enhance reception on lower 
frequencies. The NCC-1 

is often useful even if the station already employs low noise directional 
receiving arrays. 
A suggested method follows: 

Connect one Beverage or other similar low noise receiving antenna to INPUT A


Connect another Beverage or another low noise receiving array to INPUT B 

Connect theNCC-1 RECEIVER connector to the receiver's input line. 

If you are using a Reversible Beverage, runtwo feedlines back to theNCC-1 
INPUT connections. Then use the NCC-1 to control the directivity and nulls. 
---- 
Any suggestion on how to use the unit best? Set up another single RX 
Element? Use 'the tower'? 

Thanks! 

Carsten, DL6LAU 

  

Am 17.11.13 00:34, schrieb Tom W8JI: 


What is the best acquisition between Timewave ANC-4 or MFJ-1025? 


While all of them will work, the Timewave phase adjustment causes a huge 
change in level. It also has less phase range. That is bad, because you have

to go back and forth between the controls more. 

The phase should really only change phase, and the level or balance should 
really only change the signal levels. The MFJ is much better at control 
action than the Timewave, and it has much better IMD performance. The DXE 
NCC is, of course, better than the MFJ for everything. The DXE has much 
wider phase range and better IM performance, but you pay for the complexity.



73 Tom 
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