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. > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
