[Elecraft] Diversity Receive as Noise Canceling? (was K3 Plasma TV and other non OT junque)

[Don Wilhelm]

  Dick,

Most of the noise cancelling systems reverse the phase of one of the 
antennas and feed the combined result to the receiver,  If the noise 
antenna receives only noise, the noise will disappear and only the 
signal will be present, but in practice, the noise antenna picks up some 
signal too, and will attenuate the signal to the extent of the signal 
pickup on the noise antenna.

In theory, it should work equally well at the output of two receivers 
each being fed from separate antennas.
Of course, with two full receivers involved, the complexity of 
adjustments to achieve the same amplitude on each receiver becomes more 
of a challenge, and the phasing adjustment requirements for the noise 
antenna are still present.

For those interested in trying it, I would suggest that you "use the 
brain" to do the final filtering and simply swap the speaker or 
headphone connections of one channel to observe the results.  If you 
remember phasing of stereo speakers, then you will understand how just 
reversing the speaker (or headphone) leads will result in cancellation 
or re-enforcement of sound.

So what I am saying is that it should be relatively easy to try - let us 
know the results.

73,
Don W3FPR

On 11/27/2010 6:00 PM, Edward Dickinson, III wrote:
> Hi Ed,
>
> That's a good question.  I've wondered that myself.  Perhaps some more
> knowledgeable will chime in.
>
>