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

[Ed Pflueger]

Well I made the same modifications to K3 #2971 and using the USB interface
am able to do AFSK just fine using MMTTY.  Sounds like there is a Gremlin
loose somewhere.  I have a K3S (10858) and using a dummy load and wattmeter
and can copy everything that #2971 transmits and vice versa.  I did the same
thing with my K3S (10853) in the house and 2971 out in the garage and all
systems are go..

Sorry I can't help more.

Ed.. AB4IQ

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim Rhodes
Sent: Saturday, March 21, 2020 9:23 AM
To: n9ok <n9ok at arrl.net>
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 doesn't work in AFSK-A mode but DATA-A does work.
What's broken?

OK, I set things back up with AFSK for RTTY instead of FSK. My results were
the same as Joe's. If I set data mode to DATA A things work as expected
whether using VOX or my usual interface for PTT. However when I switch data
mode to AFSK and VOX on and hit the TX button nothing happens, if I plug in
the FSK interface just for PTT the K3 goes into transmit but there is no
output and no tones in the monitor.  My only conclusion is that there is
some logic in the K3 or the new USB interface that is not routing the audio
properly in AFSK mode. This is apparently not the case with the K3S.  So Joe
there is your answer. It is not your setup it is the radio. Maybe when the
K4 is all rolled out they can take a look at the firmware and come up with a
solution.  My current FSK interface is 2 transistors and 2 resistors in each
of 2 db9s connected in parallel to the db15hd pins for PTT & FSK.
This allows for SO2V operation with minimal fuss. I have never owned a
commercial interface, so have no experience with them.

On Sat, Mar 21, 2020 at 6:26 AM n9ok <n9ok at arrl.net> wrote:

> Thanks to all who've provided suggestions.
>
> I've given up on making ASFK-A work with RTTY and am going back to FSK.
> It's
> a more complex setup, but it works. The engineer part of me is pretty 
> irritated about this. I don't like giving up on problems. However, I 
> think I've done everything I can on this end and I have better things 
> to do than to stress about this.
>
> 73 Joe N9OK
>
>
>
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--
Jim K0XU
jim at rhodesend.net
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