[600MRG] QEX Noise Canceller

[sbjohnston at aol.com]

 Ken wrote:


there is no way a short whip with a 25 dB amplifier on it can  
possibly hope to feed enough noisy signal into the combiner to 
actually achieve proper phase-cancellation.

 
That is true if the noise source is elsewhere in the neighborhood.  But in my experience, even knowledgeable hams allow their own houses to be "poisoned" with RFI-producing stuff.  If the noise is coming from inside your own house - oreven right in your own shack - then a whip in the shack as the noise sensing antenna may do the job.  

I prefer to keep my house as free of noise sources as possible - ask my family how often they see me prowling around with my Sony 2010 portable receiver trying to find a new source of noise!  By the way, the vast majority of the time the new noise source is a switching power supply - usually a wall-wart charger for a new electronic gadget.  I replace it with a linear-type wall wart from my collection and the RFI is gone.

 

Steve WD8DAS / WH2XHY

sbjohnston at aol.com
http://www.wd8das.net/
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