[RTTY] MMTTY difficulties

[ham at n0sq.us]

Joe Subich, W4TV <lists at subich.com> wrote ..
> 
>  > You said you have not tried EXTFSK yet -- that means you are
>  > transmitting in AFSK!  Not FSK.
> 
> Not necessarily true.  Are you using a "real" (motherboard or PCI/PCIe
> card based) serial port or a USB to serial converter?

A real motherboard serial port - not USB

> 
> If you are using a USB to serial converter you will need EXTFSK if
> the converter does not support slow data rates - unfortunately there
> is no way (short of reading the manufacturers specifications for the
> USB UART/BRIDGE used in the converter) to know if a given device will
> work at low speeds.  However, most *new* (currently manufactured)
> converters do not work below 110 or 300 bps.
> 
> 73,
> 
>     ... Joe, W4TV
> 
> 
> On 2/8/2013 4:37 PM, Kok Chen wrote:
> >
> > On Feb 8, 2013, at 1:24 PM, ham at n0sq.us wrote:
> >
> >> I reversed polarity in the TS2000 (MMTTY + N1MM software). The Kam+ is connected
> to a TS450.
> >> ...
> >> I haven't tried EXTFSK yet. But, I do have access to an oscilloscope.
> >
> > Aha, therein (those two statements) might be the clue we sought :-).
> >
> > You said you have not tried EXTFSK yet -- that means you are transmitting in
> AFSK!  Not FSK.
> >
> > If so, reversing the polarity of the TS2000 FSK transmit setting will do nothing
> (unless you swap USB/LSB in data modes).
> >
> > What you need to do is to go into MMTTY settings and reverse its transmit AFSK
> tones.
> >
> > I don't run MMTTY (or any Windows program, actually), but someone else here can
> probably immediately point you to where to reverse the MMTTY AFSK tones.
> >
> > GL es 73
> > Chen, W7AY
> >
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