[RTTY] AFSK to FSK converter

[Richard Ferch]

Bill,

As I understand it you are using 2Tone from within N1MM Logger. If so, 
there is a way to use MMTTY to transmit FSK and still use 2Tone on 
receive. As your main decoder in the DI window, select MMTTY and 
configure it for FSK. Open one of N1MM Logger's Additional RX windows 
(from the bottom of the DI window's Setup menu) and configure it to 
point to a copy of 2Tone (use a separate copy of 2Tone for each window 
you use it in). The additional RX window is clickable just like the main 
RX window. This should let you use 2Tone on receive and still use FSK to 
transmit.

Note that 2Tone's AFC cannot be disabled (that's probably part of why it 
works so well). Therefore the tones it emits may not necessarily be on 
2125/2295 Hz. Even if the difference is within the tolerance of the AFSK 
to FSK decoder, you might still find yourself transmitting and receiving 
on different frequencies. If you are using FSK to transmit, the Net 
on/off with Run change option recommended by G3YYD won't work. A 
possible workaround for this might be to always do an Align operation 
before starting an S&P QSO. You might try embedding an {ALIGN} macro in 
your F4 message in N1MM Logger; I haven't actually tested this, but it 
might be worth a try.

73,
Rich VE3KI


W6WRT wrote:

> What I'm looking for is a board that will take the two audio tones of 2125 and
> 2295 Hz from the line out of the computer and translate them into an FSK keying
> signal.
>

and

> I've been running 2Tone and RiTTY by K6STI simultaneously on two
> separate computers with the same audio feed and I have to say I'm impressed.
>
> I won't say 2Tone is equal to RiTTY (few things are) but it was very close when
> it came to picking weak ones out of the noise.