Rich,
I seem to recall that the serial port needed for FSK generally cannot
come from the run of the mill USB/RS232 converters. They can't operate
at 45 baud/5 bit rate needed.
See: http://aa5au.com/GettingStartedOnRtty.pdf
This is old info and things may have changed.
So what does a guy who has only USB ports do other than AFSK? I thought
that was his question.
73 de Brian/K3KO
On 8/30/2018 18:19 PM, Richard Ferch wrote:
To transmit FSK from N1MM+/MMTTY with a K3 or K3S, you need: (a) some kind
of serial port-based keying interface; and (b) a cable from the keying
interface to the 15-pin ACC port on the back of the K3/K3S (pin 1 is the
FSK keying input).
The serial port used for FSK keying by MMTTY must be a different serial
port from the port used by N1MM+ for radio control. The two programs cannot
share the same serial port.
The serial port interface can be a one-transistor keying circuit connected
to a true serial port, or the same kind of interface connected to a
USB-to-serial adapter with the help of the EXTFSK plugin in MMTTY, or a USB
device that incorporates both a virtual serial port and a keying circuit,
such as a commercially available keying interface (e.g. microHam,
RigExpert, ...), or a TinyFSK (either with a special plugin for MMTTY or
used directly from N1MM+).
In principle, an RTTY program could use radio control commands to key FSK
via the USB cable to the radio, but none of the RTTY modems supported by
N1MM+ (including MMTTY) use this method. It should be possible to program
CAT1ASC macros into the N1MM+ function keys to implement this approach, but
I don't know whether anyone has tried this. There are a number of people
who have used a similar approach for keying CW from N1MM+ with the KX2 and
KX3, and offhand I cannot think of a reason why it would not also work in
FSK RTTY, but I have never tried it. Just as in CW, there are likely to be
some features of N1MM+ that work with more traditional methods but that
wouldn't work using this unsupported method.
73,
Rich VE3KI
PD1RP wrote:
I want to do FSK with my K3S.
N1MM and MMTTY.
The USB cable i used it for radio control.
What kind of cable do i need for FSK or can i used the USB cable also.
Any suggestions are welcome.
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