[Elecraft] Diversity Receive as Noise Canceling?

[Edward R. Cole]

As I understand the operation of the phasing noise cancellation 
units, they have both phase and amplitude adjustments.  I'm sure that 
can be done digitally.  How difficult, what issues?  Have to leave 
that to the SDR experts.  If not feasible, no harm in asking.

*******
BTW I home-built a 144-MHz adjustable polarity control using a 
variable phase and amplitude control.  This is now done in sw by 
Linrad with two receivers looking at Horz and Vert polarity 
signals.  It is essentially a dual-channel SDR with orthogonal RF inputs.

I will be implementing this with a new 144-MHz dual-channel receiving 
transverter feeding my dual-Rx K3.  The dual audio streams will feed 
a soundcard for the A/D conversion input to Linrad.  Linrad has the 
ability to extract the phase information to display the angle of polarization.

73, Ed

At 12:10 PM 11/28/2010, Guy Olinger K2AV wrote:
>There is also the issue that the various AGC's may be varying the 
>amplitude, so the process would have to address both instant 
>amplitude and phase to affect cancellation.  Should be able to 
>program that, though.  How hard to code, who knows???
>
>73, Guy.
>
>On Sun, Nov 28, 2010 at 1:15 PM, Edward R. Cole 
><<mailto:kl7uw at acsalaska.net>kl7uw at acsalaska.net> wrote:
>OK, I realize the Timewave and MFJ noise cancellers operate at RF and
>not AF...But I was thinking of the amazing noise reduction that SDR's
>accomplish in the digital relm.  I understand it may not be that
>simple.  But sometimes asking the question gets new thinking going.
>
>For example the second IF of 15-KHz is digitized and run thru FIR
>filters; could two separate digitized data streams from the two
>receivers be added out of phase digitally?
>
>
>73, Ed - KL7UW, WD2XSH/45
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73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
EME: 144-800*w, 432-100w, 1296-testing*, 3400-winter?
DUBUS Magazine USA Rep dubususa at hotmail.com
======================================
*temp not in service