[Elecraft] K3S fsk with usb

[Henk de Vries (hdv)]

Hi Peter,

Using a regular/cheap USB <> RS232 converter and NPN-"interface" to the ACC
port.
FSK works fine here with my K3s.

MMTTY settings:
TX menu : port = EXTFSK64
Misc menu : tx-port = Com-TxD(FSK) ,  click USB and set C where needed

Audio via USB.

Henk PA0C

PS, kan jammer genoeg niet met RTTY contest meedoen

-----Oorspronkelijk bericht-----
Van: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net>
Namens brian
Verzonden: donderdag 30 augustus 2018 19:36
Aan: elecraft at mailman.qth.net
Onderwerp: Re: [Elecraft] K3S fsk with usb

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 
> N1MM+ 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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