John, do any of the SDR programs you mention allow you to monitor the two audio outputs AFTER the inserted phase shift?
Here's why I ask, although it is essentially unrelated to a normal SDR application ... I'm convinced that we should be able to use the diversity feature of a K3 with both receivers to spacially discriminate against an unwanted signal. We should be able to do it in the horizontal plane by feeding two vertical antennas into the K3, one into each receiver. We might be able to partially do it in the vertical plane by, for example, feeding two stacked antennas on the same tower into the K3 .... one into each receiver. All we need is a variable phase shift in the audio since phase is preserved in the conversion from RF to audio. I've searched for normal audio processing software to accomplish this (volume equalization, phase shift, inversion, sum), but so far haven't found anything other than some extremely expensive professional audio stuff for large auditoriums. I've always thought that something like this could be built into the K3 internal software, maybe using the VFO B knob to adjust the phase. The K3 phase lock in diversity mode is not determinant (the actual phase is essentially random at any frequency) so the null would have to be readjusted at each frequency, but I still think it would be a neat capability. At one point (more than a year ago) Elecraft sounded mildly intrigued by the idea when I first suggested it, but I don't think they've spent any time on it. 73, Dave AB7E On 11/11/2011 6:54 AM, John Ragle wrote: > Several of the SDR programs also have an "image > killer" available. I am guessing when I say that this "image killer" > works by adjusting the phase (time delay)...the ones I have used are > offset-specific WRT the particular image that is removed. > ______________________________________________________________ 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
