I've recently been using an MFJ-1025 Noise Canceling Signal Enhancer. I'm having a lot better success with than I did with a ANC-4, now produced by Timewave. These units, along with a similar one from DX-Engineering, in general work by having a 2nd antenna as a 'sense' antenna. The unwanted noise is picked there and inverted in phase and mixed with the same noise as received with the main antenna.
I credit most of my recent success over previous attempts to having a bandscope. That factor is making all the difference in the world in terms of usability. Rather than listening to a single frequency and attempting to hear a null amongst perhaps all kinds of noise, one can observe changes and adjustments across some bandwidth and directly observe the result of not only 'background noise,' but birdies and odd frequency specific noises. There are times when 40 meters would be inoperable for me because of line noise. I am able to near completely remove that and don't have to deal with distortion products. It might be an interesting design project to create such a unit as an add-in option for the K3. 73, Dick - KA5KKT ______________________________________________________________ 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
