[RTTY] MMTTY difficulties

[Joe Subich, W4TV]

 > 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?

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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