I am not familiar with the ANC-4, but I assume it is similar to the MFJ noise cancellers. Those units are not "receivers" but work with the weak antenna signals at the originally transmitted frequencies. Aside from some signal buffering, such a unit essentially provides the capability to continuously adjust the phase difference and relative gain between the two inputs, and to do this at a wide variety of ham band frequencies. If you instead feed the two antennas into twin receivers, you would have to adjust amplitude and phase at the output. At audio frequency it is hard enough to build a phase shifting network that maintains constant phase shift over a reasonable audio frequency range, but if you want to make that phase shift continuously knob adjustable it becomes really hard. The DSP in the K3 has potential as a precision phase shifter, but consider that the frequency-dependent phase shifts that may be caused by the different xtal filter specimens and analog components in each receiver may have already messed up the phase relationships by the time the signal gets to DSP or receiver output.
73, Erik K7TV ______________________________________________________________ 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
