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 dk...@gmx.net
To: elecraft@mailman.qth.net elecraft@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
http://www.kl7uw.com
Kits made by KL7UW
Dubus Mag business:
dubus...@gmail.com
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