[Elecraft] Cannot transmit RTTY with internal K3 sound card using MITTY

[Don Wilhelm]

Tyler,

Make sure the K3 internal soundcard is feeding enough audio into the K3 
- if you have anything plugged into the Line IN jack of the K3, remove 
it because that overrides the soundcard TX audio.

Go to my website www.w3fpr.com and scroll the left column to the last 
article.  That information will help you with setting the proper audio 
levels.

At first, you may want to turn VOX off and use PTT via CAT command, or 
enter transmit with the XMIT button while adjusting the audio levels.
After that is accomplished, you should be able to use VOX, although I 
think PTT via CAT command is better - each to his own, I know some 
disagree with me.

BTW, you can make all those adjustments with the K3 in TX TEST mode so 
you do not have any RF output to worry about.

73,
Don W3FPR

On 7/18/2020 3:44 PM, Tyler Barnett via Elecraft wrote:
> Dear Reflector gurus,
> 
> Using my internal K3 soundcard, I can receive RTTY OK, but cannot transmit using MITTY.
> 
> I am using the internal K3 soundcard (ugraded my K3 with the K3S parts).
> The MITTY Option(O) has the proper Input and Output device selected (the internal K3 soundcard codecs).
> Asking MITTY to trasmit my callsign doesn't key the K3.
> The MITTY Options > Soundcard tab has the correct Reception and Transmission settings (the K3 codecs).
> 
> I changed the Windows output device from the K3 internal codec to my headphones, and can hear MITTY transmit into my headphones.
> So I'm guessing this is a K3 setting, and I'm baffled.
> 
> I have the K3 set to Data mode, with VOX on.
> The DATA MD setting is AFSK A, 45 BPS.
> 
> The K3 CONFIG settings:
>     RS-232 set to USB
>     PTT-KEY set to OFF-OFF (I've tried all the settings)
>     AFSK TX set to FIL OFF
> 
> The MENU settings:
>     AFX MD is DELAY 5
>     MIC SEL is set to LINE IN
>     VOX GN is set to 000
> 
> Panel settings (lower left knob):
>     The Mic gain is set to LINE 25.
>     Vox delay set to 0.5.
> 
> On the MENU settings, I ramped up the VOX GN from 000 to 050.
> Then when I transmitted with MITTY, it silenced the K3 during MITTY transmission, but no power generated.
> The red TX LED didn't light either.
>