[RTTY] 2Tone 75 baud FSK transmit

[Gary AL9A]

Ken,

My experience with 2Tone at 75 baud is exactly the same as yours.  I too 
ended up going back to MMTTY for TX and using two 2Tone clone windows to 
help with the decode.  With 2Tone running at 75 for TX it would start out 
ok, but then before the end of the macro it would start sending garbage and 
then the radio would hang up.  I couldn't clear it with the ESC key and had 
to shut down WL to stop it from transmitting a solid tone.  As you state it 
has worked perfectly for me too at 45 baud, but something in the lash up is 
out of whack at 75 baud.  Hope somebody discovers the problem and a fix 
soon.  Or at least before the next BARTG 75 Sprint!


73,
Gary AL9A

-----Original Message----- 
From: Ken Beals
Sent: September 23, 2014 12:53 PM
To: Joe Subich, W4TV ; rtty at contesting.com
Subject: Re: [RTTY] 2Tone 75 baud FSK transmit

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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