Topband: NOISE CANCELLERS

[Jon Zaimes AA1K]

Carsten,

I use one of mine with a pair of the "W8JI style" short verticals -- 22 
feet high with four 22-foot top-loading wires, and 16 radials each 25 
feet long. There is a series inductor and resistor at the feedpoint.

These are in a line to make them endfire NE/SW and spaced about 1/8 wave 
(70 feet).  Signal change as I tune the phasing control can be dramatic 
as the pattern changes.

Performance is similar to a single one-wavelength Beverage, and in some 
conditions signals are equal to my phased Beverages.

I have under construction a broadside-endfire set of four short 
verticals that will use an NCC-1 to phase rather than a fixed line.

I have also used combinations of Beverages with the NCC-1 and the 
results vary.

73/Jon AA1K


On 11/17/2013 4:54 AM, Carsten Esch wrote:
> ... 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
>