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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