[RTTY] 2Tone 75 baud FSK transmit

[Ken Beals]

Yep, that’s exactly what I did Joe. I’ve been using 2Tone in 45 baud FSK for a while now and it’s been perfect. The only thing I did this weekend was change speed to 75 baud. It diddles, but something is not quite right. I set up the two radios so that I could decode the transmit on the other radio and it’s definitely not right. You get about 50% of the characters correctly but that’s it. My call almost always decodes as K1MC. I even had a dx station call me that when I first started calling people this last weekend.


I keep thinking there is something else that’s needs tweaking but I don’t know what. I’m not terribly concerned given how often 75 baud is used, and I have a workaround. But it would be nice to make it work.


tnx,


Ken K6MR 






From: Joe Subich, W4TV
Sent: ‎Tuesday‎, ‎23‎ ‎September‎, ‎2014 ‎13‎:‎48
To: rtty at contesting.com






> I’m thinking I missed something but don’t know what. Using a u2R for
> the interface but don’t suspect that since MMTTY works.

2Tone FSK transmit is *very different* from MMTTY transmit.  MMTTY uses
the UART interface - the UART does the timing - while 2Tone toggles the
TxD line directly.

If you had micro2R (and Router) configured to provide a UART interface
for MMTTY and did not make the necessary changes, 2Tone's output would
be completely scrambled.  For MMTTY you need to set the USB Port (in
MMTTY's MISC tab) to Option C and check the "Stuff" box on Router's
FSK port.  For 2Tone, both the "Stuff" and "Strict BPS" box on Router's
FSK Port must be *unchecked*.

Clearing the "Stuff" box tells Router (and the controller in micro2R)
that the FSK port TxD is going to be controlled directly (2Tone FSK,
WriteLog "Software Generated FSK" or MMTTY's EXTFSK64).  Checking the
"Stuff" box lets Router (and the controller in u2R - or MK II, DK II,
MK2R+) know that the application accessing the FSK port will be using
the UART and that the controller should generate diddles whenever there
is no data in the input buffer to maintain receiver synchronization.

73,

    ... Joe, W4TV


On 2014-09-23 4:25 PM, Ken Beals wrote:
> Wondering if anyone here used 2Tone @ 75 baud FSK this last weekend.
> I had some trouble getting it going and I’d like to compare notes.
> Receive worked fine but no one could decode my transmit signals.
> Switched over to MMTTY for transmit and carried on. Checked 2Tone in
> AFSK after the contest and that works fine.   I’m thinking I missed
> something but don’t know what. Using a u2R for the interface but
> don’t suspect that since MMTTY works.
>
>
> Thanks,
>
>
> Ken K6MR _______________________________________________ RTTY mailing
> list RTTY at contesting.com
> http://lists.contesting.com/mailman/listinfo/rtty
>
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