Topband: Topband NOISE CANCELLERS

[Tim Duffy]

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 
_________________ 
Topband Reflector 



 

_________________
Topband Reflector