[RTTY] 75 Baud ... RigExpert ...

[Peter Laws]

So, long story short ... MMTTY does not send FSK through the RigExpert
TI-5 unless you use the EXTFSK DLL, which means no 75 baud.  This
despite VE3KI's much appreciated off-list help.

It will send FSK using MixW.  I'm still not totally clear where this
limitation actually lies:  is it an MMTTY/EXTFSK thing or a RigExpert
thing?  Clearly MixW can make it work and I can even do 75 bauds with
it (with a jumper change in the box).  Why can't MMTTY do that?

Even though RE has a generous 30-day no questions asked return policy,
it's a giant pain in the assembler language to return it and find
another "single wire" box.  So what other options are there?  Is there
another RTTY engine that will work with N1MM and let me do 75 baud?

I don't like it, but I could live with using MMTTY+EXTFSK for regular
QSOs (standalone or via WinWarbler) and even for regular contests
using N1MM ... I'd just really rather just use MMTTY like I have for
almost 10 years.


On Sun, Sep 15, 2013 at 8:24 AM, Richard Ferch <ve3iay at storm.ca> wrote:
> Comments/answers in-line below.
>
>
>> Figured I'd start here.
>>
>> Want to play in 75-baud BARTG tomorrow.  Have a new Rigexpert TI5
>> which supports FSK.  The problem is that the TI5 uses different fake
>> com ports for PTT and FSK.  It does this by hacking EXTFSK, the DLL
>> that comes with MMTTY.
>
>
> I believe you have stated this backwards. As I read the manual, the TI5 uses
> different virtual COM ports for CAT, PTT, Winkey and FSK without EXTFSK. I
> believe the reason RE included the hacked version of EXTFSK with the TI5 is
> to support software that must use the same port for PTT and FSK. This is not
> a problem if you are using the N1MM Logger/MMTTY combination, because you
> can do PTT from N1MM Logger and FSK from MMTTY on separate ports, thereby
> avoiding the need to use EXTFSK.
>
>
>  And RE didn't hack EXTFSK (as far as I can
>>
>> tell - the windows doesn't pop up with the hacked version) to support
>> 75 bauds.
>
>
> As I understand it, the reason EXTFSK doesn't support 75 baud is because of
> unacceptably large (for 75 baud) timing jitter with the method EXTFSK uses.
> EXTFSK is a method of last resort, to be used only if you have no
> alternative. Frankly, if you take a reasonable amount of care with sound
> card settings, I think AFSK is preferable to EXTFSK.
>
>>
>> I run N1MM with the MMTTY engine though in this case, I don't know if
>> that makes a difference.
>
>
> Yes - it means you can use the separate ports for PTT and FSK without
> resorting to EXTFSK. If the TI5 driver uses COM3 for CAT, COM4 for PTT, COM5
> for Winkey and COM6 for FSK, for example, you can configure N1MM Logger to
> use COM3 for radio control, COM4 for PTT on RTS, COM5 for CW using the
> Winkey, and COM6 as the digital port, configured in MMTTY for FSK.
>
>>
>> Would it be possible to set the "PTT & FSK" setting in MMTTY to the
>> FSK port (COM10 here) and then use the "Radio Command" setting?
>
>
> No. The radio command (CAT) port is in use by N1MM Logger for radio control.
> MMTTY does not have access to it.
>
>
>  Or
>>
>> are they tied together somehow?
>
>
> If you are using MMTTY stand-alone, it uses the same port for PTT and FSK.
> Even when run under N1MM Logger, MMTTY will send commands to toggle RTS and
> DTR on its FSK port for PTT, but as I understand it the TI5 will simply
> ignore those commands. You should configure N1MM Logger to control PTT using
> RTS on the TI5's PTT port (RE calls this the PTT/CW/SoftFSK port, but the
> only thing you need to use it for is PTT).
>
> One issue you may run into is the timing of PTT. The transfer of data over
> the USB cable is much faster than the actual transmission, and with some
> setups that can result in PTT turning off before the data has finished being
> transmitted. With any USB-based device, in the MMTTY Setup window you should
> click on the USB Port button beside the COM-TxD(FSK) selection under the
> Misc tab, and select C. Limiting Speed.
>
>>
>> And, yes, like my old RigBlaster+, I have to fiddle with a jumper in
>> the RE ...  (I haven't ordered the reed switches yet).
>
>
> In addition to the baud rate jumper in the TI5, you will also have to set up
> MMTTY to receive 75 baud. See
> <http://n1mm.hamdocs.com/tiki-index.php?page=Digital+-+MMTTY+for+RTTY+Support&structure=N1MM+Logger+Documentation#Using_MMTTY_for_75_baud_RTTY>
> for some of the things to look out for.
>>
>>
>> Anyone encounter this before?
>>
>>
>> --
>> Peter Laws | N5UWY | plaws plaws net | Travel by Train!
>
>
> 73,
> Rich VE3KI
>
>
>
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-- 
Peter Laws | N5UWY | plaws plaws net | Travel by Train!