Alfredo,
Looking at the MMTTY information files
(
http://www.aa5au.com/gettingstarted/rtty_start8.htm), to operate using
only the serial RS-232 port, you will need to install EXTFSK.dll. And
the author suggests that only certain USB to serial adapters can handle
the 5 bit Baudot code that is sent.
So my thoughts are that you need two of the Simple Transistor Interface
circuits shown on page 6 of those MMTTY instructions. One for PTT and
one for FSK. You may ask why you need two of them when the K3 can use a
PTT signal from the normal RS-232 cable, but the answer is that the FSK
signal from MMTTY is on the TxD signal and the PTT can be either on RTS
or DTR - *but* they must be on the same com port. You need one com port
for MMTTY and another for K3 firmware loads or your logging program.
73,
Don W3FPR
On 12/22/2012 8:10 AM, Alfredo Vélez WP3C wrote:
> HI Everyone
>
> I already set up the audio problem. I turn OFF the TX ESSB and it’s done.
> When it is ON the audio distorts. But, now I need help in digital mode, the
> reception is on, but transmitting, the carrier stays on and does not
> transmit. I want to transmit in DATA mode and not LSB. I want FSK. I have
> the RS232 cable connected to a port. Also I have K3 in line out (stereo) to
> the audio card of the computer. In the mic (pink). I’m trying MMTTY & MixW.
> MMTTY is the best, N1MM or Wintest takes it to to RTTY contest . I would
> like to know what I am missing to put this to work in digital mode. Thanks
> and Merry Xmas for all!!!
>
>
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