[Elecraft] diversity and combining

[Edward R Cole]

Uwe,

Actually glad to see that you are also using the dual-Rx K3 on 
eme.  Using a common LO for the two Kuhne Engineering transverters is 
a good approach.  How close are the two transverters: MKU-144 G2 and 
the TR144 H.  It would seem important if gain and transfer function 
were nearly identical circuitry to preserve phase information.

My DRX model of the DEMI L144-28HP (50w model) utilizes the same pc 
board for the second Rx converter so they are identical 
circuits.  They are driven by a common xtal osc LO with additional 
buffer amplification to compensate for the splitting of the LO 
signal.  This design was produced by Steve Kostro of DEMI under 
contract from me.  As far as I am aware this was a "one of" that was made.

Otherwise, you use the same architecture of K3 and KRX3 IF to two 
LP-Pan to Delta44 for Computer DSP using Linrad and some variant of 
JT65 (I use MAP65v2 directly).  I see you use a separate soundcard 
(emu0204) for Tx modulation; I use a emu0202.  I run both of my 
LP-Pan from a single clock osc in one of the LP-Pan.

More 2m-eme stations are using circular pol in transmit, though this 
imparts 3-dB cross-pol loss at the receiving station, it does remove 
need for switching Tx polarity to match Faraday rotation of the 
signal.  I still switch my Tx H/V pol.

Therefore there are two of us using the K3 for dual-pol adaptive eme 
reception.  I wonder if there are others?

73, Ed - KL7UW

Date: Tue, 4 Aug 2015 06:11:57 +0200
From: "Uwe Pobel" <dk4ww at gmx.net>
To: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
Subject: [Elecraft] diversity and combining

http://web.stanford.edu/class/ee360/previous/lectures/lecture11.pdf


http:\\www.dk5ya.de/newtower14.html


73
Uwe
Dk4ww




73, Ed - KL7UW
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