[Elecraft] K3 doesn't work in AFSK-A mode but DATA-A does work. What's broken?

[M. George]

Joe, I created a super detailed and verbose YouTube video on the K3 RTTY /
FSK setup <https://www.youtube.com/watch?v=EToCJ5GeZSE>.  If you are not
interested in setting up FSK, you still might find it handy on setting up
the receive side of the equation.  It goes in to great detail on selecting
the tones you prefer and demos everything due to the fact that I made the
video while an active contest was going on.  You can jump head and back 10
seconds at a time on YouTube with the J and L keys and pause with the K or
space bar... or jump ahead and back with the arrow keys 5 seconds.

If you devour the whole video, it pretty much covers about all there is to
cover on a K3 RTTY setup with N1MM and MMTTY / FSK.  Again, the audio
receive setup would still be helpful if you decide to go the AFSK route
which is fine too.

https://www.youtube.com/watch?v=EToCJ5GeZSE

Based on comments over the last several years, many have found this useful
and I only needed to go through the explanation once. :) Max NG7M

On Fri, Mar 20, 2020 at 6:40 AM Joe N9OK <n9ok at myjdk.com> wrote:

> I've reached out to Elecraft Tech Support on this issue. With their locale
> on lockdown, I think they have their hands full just trying to maintain
> some sense of normalcy. So I'm hoping someone here can point me in the
> right direction.
>
> I've recently upgraded my K3 with numerous "last time buy" options (KAT3A
> antenna tuner, 2 KSUN3A synthesizers, and KIO3B usb board). One goal was to
> remove the Microkeyer II and simplifying the setup.
>
> What I'm finding now is that I can't make RTTY work correctly. I use MMTTY
> to generate a simple warble signal, which is sent to my K3. The K3 is set
> to AFSK-A, VOX enable, audio levels set correctly. What happens is that the
> K3 TX LED illuminates, but nothing is heard with the Monitor (ie, thru the
> K3 speaker), and there is no RF transmitted. However, when I use DATA-A, I
> do hear tones using Monitor, and there is RF power.
>
> I get the same results using either the K3 internal sound card, or
> externally-generated audio (fed from my PC soundcard to Line-In on the K3).
>
> Hoping there was a configuration issue, I factory reset my K3. That didn't
> help.
>
> It's probable this issue has been there since I first purchased my K3 new 8
> years ago, but I never noticed. My MKII was used as my interface, and I was
> running FSK for RTTY. I did have many configuration issues with my MKII
> setup, which in retrospect might well be related to the AFSK issue that's
> now obvious.
>
> I'm suspecting this is a hardware issue. I have the 59 pages of schematics,
> and am going thru them to see if I can identify the issue so I can fix it.
> I would appreciate comments / suggestions / ideas to point me in the right
> direction.
>
> 73, Joe N9OK
>
> 73, Joe N9OK
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-- 
M. George