[600MRG] QEX Noise Canceller

[Brian Pease]

Without having seen the article, I assume that the "noise" antenna is 
placed much closer to the local noise source than the "receiving" 
antenna.  The s/n ratio in the "noise" antenna will be poor, mostly 
noise.  This can be combined (subtracted) from the "receiving" antenna 
to cancel the local noise without canceling out very much of the desired 
signal.

On 3/30/2015 1:59 PM, Marshall Cross wrote:
> Then why not use the same antenna with a splitter?
>
> Sent from my iPhone
>
>> On Mar 30, 2015, at 12:32 PM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
>>
>>> On 30 Mar 2015 at 8:56, Frank Lotito wrote:
>>>
>>> Has anyone tried the noise canceller circuit presented in the Jan / Feb 2012
>>> issue of QEX? Specifically, for the 600 / 630 meter bands?  The article by Fred
>>> Brown, W6HPH, is titled "End Man-Made Noise with the Noise Canceller," pages 12
>>> through 14.  The author alludes to tailoring the design for the frequency band
>>> of interest.  The QEX article presents a 75 meter design.
>>>
>>> 73 Frank K3DZ / WH2XHA
>> Frank (and others):
>>
>> There was a truly excellent article in Electric Radio Magazine for February
>> 2014 on noise cancellers by Mike Murphy WU2D.
>>
>> The final unit he described both reduced his own noise level by +25 dB and
>> is adaptable, easily, to any band or frequency.
>>
>> He made the point that for any noise canceller, the only really effective
>> "noise antenna" is an exact duplicate of your normal receiving antenna.
>>
>> Mike is quite a character and is very talented. I sometimes wish he was a
>> member of this forum.
>>
>> Ken W7EKB
>>
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>>
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