[Elecraft] AFSK-A with K3s

[Mike Dodd]

Thanks to all who replied off-list to my question about choosing a Mark 
frequency. Now on to a new question....

Last night I was receiving RTTY using MMTTY and the AFSK-A mode on the 
K3s. This morning I am trying to get the K3s to transmit, but not having 
much luck.

I'm using the internal USB sound card in the K3s. I have successfully 
configured MMTTY to:

1. Receive and decode tones from the sound card.
2. Key the K3s when I click the TX button in MMTTY.
3. Send tones to the K3s when the TX button is clicked. I can hear the 
tones in the K3s speaker and headphones. If I choose a different Mark 
frequency in MMTTY, I hear the expected tones on the K3s.

Clearly audio tones are being sent to the K3s. But no RF comes out. I 
have PWR set to 50W (into a dummy load), and when I hold TUNE, the RF 
bar graph shows that power level (half scale, 5 bars).

But when I click TX in MMTTY, and hear the tones on the K3s, the RF bar 
graph shows 0 (one bar).

What must I do to make the K3s transmit the audio it's receiving from MMTTY?

Thanks in advance.

-- 
73, Mike N4CF
Louisa County, VA USA
Elecraft K3s/100
Carolina Windom up 45'
http://n4cf.mdodd.com