[Elecraft] K3 & N1MM for RTTY

[Jim Brown]

On Tue, 12 May 2009 11:18:39 -0700, Iain MacDonnell - N6ML wrote:

>Beware of this if you're considering SO2R CW with N1MM - it 
doesn't
>like the same serial port being used for rig control and CW in 
that
>case, but it seems OK with one radio.

I'll take that a few steps further. N1MM can do SO2R with SSB and 
RTTY from a single computer that has two serial ports -- IF you 
set RTTY up for AFSK and use VOX rather than PTT. That's what I 
do, and it works quite well. 

N1MM does NOT work for CW SO2R using two serial ports, or even 
four serial ports, from the same computer. It has to do with the 
way they send CW. Two good ways to do it, depending on your 
resources. The method they recommend is with a WinKey keyer. Easy 
to build, inexpensive. I bought one, haven't used it yet. The 
second way that works (for me, at least) is with two computers, 
networked, each with a single serial port. The N1MM folks will 
tell you this is "not supported." 

There are tutorials on my website about how to reliably interface 
rigs and computers without hum and buzz, using nothing more than 
wires. No transformers, no interface boxes. 

http://audiosystemsgroup.com/HamInterfacing.pdf
http://audiosystemsgroup.com/RFI-Ham.pdf

You can, of course, get much fancier, especially with control of 
your headphones. 

73,

Jim Brown K9YC