[RTTY] 2Tone 75 baud FSK transmit

[Joe Subich, W4TV]

Until further notice do not use 2Tone or MMTTY EXTFSK64 at 75 baud
transmit with microHAM "keyer" interfaces.

I do not know what has changed but while UART transmit at 75 baud and
45 baud software generated FSK continues to work properly, software
generated 75 baud FSK at is clearly distorted.  My suspicions center
on USB timing but I will need to create a "clean" system for testing.

73,

    ... Joe, W4TV


On 2014-09-24 1:59 AM, Gary AL9A wrote:
> 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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