[Elecraft] SO2R recommendations

[Dave]

I have been using the so2rduino published in NCJ
(http://ncjweb.com/features/julaug10feat.pdf) for a while now. Cost under
$50. With the 3 sets of leads I made I can use it for so2r Phone , cw or FSK
rtty

Dave
WW2R

Looking for recommendations for SO2R interfaces.  My plan is to use my K3
and KX3.  I use N1MM+ for contesting software.  Modes: CW/SSB/RTTY

I saw a kit (currently not available) from *k1xm.org/
<http://k1xm.org/>SO2R/*
<https://www.google.com/?gws_rd=ssl#>

DX Doubler from Top Ten: http://www.qth.com/topten/DXD.HTM
Microham devices: http://www.microham-usa.com/

Feedback and recommendation with interfacing the K3 and KX3 rigs and use
would be appreciated.

Doug NA1DX
doug at ellmore.net