Hello Lee
You are about right:
Line in/line out are just alternatives to using the front or rear
microphone socket and work on SSB as well as data.
Data A (short for data audio) is the same as SSB, except that
compression is forced to zero. You can reverse the sideband by pressing
and holding "ALT". The dual passband isn't available in this mode,
neither is text decoding on the K3 screen (trying either results in a
display of "N/A"). Generally used with any sound card data mode.
AFSK A is used for "audio" RTTY but otherwise is the same as Data A,
sideband reverse is available, dual passband works and so does text
decoding. Sending RTTY via the paddles doesn't work on this mode.
FSK D is for hard wired RTTY keying. This mode also allows RTTY keying
by using the Morse paddle input. Sideband reverse is available via
"ALT", dual passband works as does text decoding.
I've not tried the PSK D mode.
For hard wired RTTY, the single transistor shown in the MMTTY help files
works fine.
Perhaps the easiest way to operate the K3 on sound card data modes is
with Ham Radio Deluxe and DM780 (included with HRD). You only need two
audio cables to/from the Line in/Line out and a serial cable. HRD keys
the radio via the serial cable (no need to specify anything special,
except to set the serial data rate and comm port), the program also
knows the RF frequency of the displayed tone, so setting your K3 to the
centre frequency of one of the Olivia 500 channels doesn't involve any
head scratching or maths on your part!
73 Dave, G4AON
K3/100 #80
------------------------
I am reading the book here and trying to understand how to set up RTTY
or PSK with the K3. What gets in my way is the RTTY reading and
generation algorithm. I am not all that excited about that right now,
but I am just trying to get my sound card hooked up to the Input and
Output with PTT as well. Three simple cables and I am sure where all
that goes.
What is confusing is how to set up the radio. AFSK-A is selected by the
B Vfo when you use Data MD. So supposedly, the line out audio which goes
in the sound card will work, but more importantly, the line in of the K3
will accept the audio generated by the soundcard. I don't have to turn
on the TEXT DEC unless I want to see the RTTY message on the K3's
screen. Once I get FSK set up and I would them change VFO B to FSK D.
I think that is right...or have I taken a wrong turn...
Lee
_______________________________________________
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
