[Elecraft] [K3] Diversity Reception and Antenna Directivity

[Bill W4ZV]

David Gilbert wrote:
> 
> 
> Playing around with this stuff got me thinking, though.  What if I fed 
> the output from two VERTICAL antennas into the K3 receivers in diversity 
> mode, fed the audio output of both receivers into the A and B channels 
> of the computer sound card, and used an application that introduced an 
> adjustable delay in one audio channel before summing the two channels 
> and doing the D/A translation back to monaural audio?  Wouldn't that 
> have the exact same effect as being able to adjust the phase of the 
> incoming RF, and therefore the directivity of the 2 element vertical 
> array?  
> 

Good idea, already implemented by MFJ, DXE and others:

http://www.mfjenterprises.com/Product.php?productid=MFJ-1025
http://www.dxengineering.com/Parts.asp?ID=1227&PLID=215&SecID=114&DeptID=12&PartNo=DXE-NCC-1

This reminds me of one SDR guru who proposed using 4 SDR transceivers to
emulate a 4-square.  A multi-K$ solution to a $350 problem (i.e. one 4SQ
controller box)...not to mention the need for 4 separate feedlines, 4
amplifiers, etc. 

73,  Bill

P.S.  I believe one problem with what you proposed above is that phase would
need to be readjusted every time you touched the VFO...i.e. phase is locked
(i.e. meaning the phase differential is fixed) but the actual phase offset
between the two RXs changes each time the synthesizer changes.  Lyle can
correct me if I'm wrong.
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