[Elecraft] New DSP Idea

[Nr4c]

I’m not an engineer but from the discussions here in the past, in diversity mode, the VFOs are not “phase locked” but actually driven by the same synthesizer, so they both get the very same frequency info.  Thus output the same frequency. 

Sent from my iPhone
...nr4c. bill


> On Jan 12, 2019, at 5:06 PM, David Gilbert <xdavid at cis-broadband.com> wrote:
> 
> 
> I know Wayne requested direct replies to his query and I've already done that, but I have a serious suggestion and I'm curious if others here would be interested.  Here it is:
> 
> ===
> The two receivers in a K3 or K3s can be phase locked for diversity reception, and the new synths preserve that phase lock even with a change in frequency.  Since the relative phase of an incoming signal presented to the two receivers is preserved during down conversion, it is possible to capture that phase difference even in the audio chain.  Once that phase difference is known, it should be possible to:
> 
> 1.  Display the difference.  This would allow a user to put up two vertical sense antennas to determine the azimuth of an incoming signal (albeit with a potential mirror image uncertainty).  Or put up two horizontal sense antennas to display the arrival angle of an incoming signal.
> 
> 2.  Better yet, it should be possible to adjust the relative phase and amplitude of an incoming signal from the two antennas, then either add them or subtract one from the other to either peak a desired signal or null an interfering signal (including a source of noise, man made or atmospheric).
> ===
> 
> There are commercially available pieces of hardware from various ham suppliers that perform this same function except at RF (which is more difficult), and they cost several hundreds of dollars.  It seems to me that any K3s, or K3 with the new synths, should be able to do the same thing virtually for free.
> 
> 73,
> Dave   AB7E
> 
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