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

[Wes]

Do the MMTTY tones match the ones (Pitch) in the K3?

Wes  N7WS


On 3/20/2020 5:40 AM, Joe N9OK 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
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to wes_n7ws at triconet.org