Guy, K2AV wrote: > > The problem with "automatic" is that it needs to know what out of the > composite signal you are getting do you want nullified. You will > still need manual input for this. Further, this is in effect only on > the frequency you are on. Only RF cancellation has the broadband > nullification. >
I agree. Using a phasing unit you're combining the desired (i.e. from RX antenna) and undesired (i.e. from noise sense antenna) signals to minimize the combined antenna pattern's rejection of the undesired signal (azimuth and elevation). This allows one to place a null on a localized area of thunderstorm activity (i.e. not just a single coherent signal) by manually adjusting for best overall noise rejection. Of course it also works well to null someone, not in the desired direction, that may be causing QRM (i.e. to the sides or rear), assuming you have a good sense antenna in that direction. It will NOT work well for either noise or QRM generally inline with the desired RX direction. 73, Bill -- View this message in context: http://elecraft.365791.n2.nabble.com/Diversity-Receive-as-Noise-Cancelling-tp5789335p5792252.html Sent from the [K3] mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
