[Elecraft] K3S fsk with usb

[brian]

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.
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to alsopb at comcast.net
>
> ---
> This email has been checked for viruses by AVG.
> https://www.avg.com
>