[Elecraft] RTTY with K3

[Don Wilhelm]

Tom,

Many USB to serial adapters do not work at slower speeds, and the FSK 
input to the K3 is at a slow speed (the baud rate for RTTY is slow).

The Edgeport USB to serial converters seem to work well at any speed (I 
have the 4 port converter).  Note that there is an apparent difference 
between "converter" and "adapter".

If you do not wish to purchase another adapter (converter), you might 
want to set the K3 up for AFSK-A and use your soundcard to both the K3 
LINE IN and LINE OUT - just set the audio levels as you would for any 
other soundcard data mode - 4 bars solid on the K3 ALC meter with the 
5th bar flashing.

Once the audio levels are set, you should not have to touch them during 
operation.  An external soundcard is best as long as it is not set to be 
the default soundcard in your computer - if it is, turn off any sounds 
from your Operating System.

You do have a soundcard that you are using for the RTTY decode, use the 
same one.

AFSK-A is as good as FSK-D, and may give even better IMD performance.

73,
Don W3FPR

On 6/22/2017 5:01 PM, Tom Fitzpatrick via Elecraft wrote:
> Trying to set up RTTY on the K3. Receive working fine using MMTTY. Hooked USB from computer through USB/Serial converter and plugged through an opto-isolator adapter to the ACC plug for FSK. It doesn't key the rig and no keying is coming through. I've tried 2 different USB/Serial converters. Seems I read somewhere there's a special one (expensive) that is the only one that will work?