[Elecraft] K3 and RTTY

[Fred Jensen]

The easiest way is to go AFSK.  It will take two stereo cables from RS 
or wherever.  Laptop LINE OUT goes to K3 LINE IN, K3 LINE OUT goes to 
laptop LINE IN.  If the laptop doesn't have a LINE IN, use the MIC jack. 
  K3 line out level is in a CONFIG: setting.  When LINE IN is selected 
in the menu the MIC gain becomes LINE IN gain.  Be sure and select only 
line in, there is an option which leaves your mic hot too.

N1MM has a digital window in the "Windows" menu.  It has a RTTY TU but 
it's not the best, most folks use MMTTY or 2TONE add-ons.  MMTTY is 
free, just download it.  I think you also have to tell N1MM where MMTTY 
is on your computer.  MMTTY is fairly complex and has lots of 
configuration abilities.  It will work very well pretty much "out of the 
box" however.

You will need to select the tone frequency in the K3 with the PITCH 
control.  I think there are 4 choices, I recommend 915 Hz, it's a lot 
easier on your ears.  You need to set that same tone freq in MMTTY.  I 
use NET on, AFC off, and UOS on.  HAM=off, it forces the tones to the 2+ 
KHz standard.

In TX TEST, first adjust the MIC knob for 4 bars of ALC and the 5th 
flickering when MMTTY is in transmit.  THEN set your desired power 
output with the PWR knob.  You can't adjust the power out with the MIC 
gain control.

You may need to cut the K3-->computer cable and put a 1:10 divider in it 
if the K3 line output is too hot for the computer sound card input.

There are a lot of steps but once it's set up, you don't have to mess 
with anything.  Best to start and then ask specific questions.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org

On 1/29/2015 3:55 PM, Robert 'RC' Conley wrote:
> I would like to start RTTY operations and I really don't know where to
> begin to accomplish this task. I have a K3/100 with a P3 and a Dell laptop
> that runs Windows 7 professional. Also use N1MM when contesting Any
> directions would be helpful.
> Thanks KC5WA
>