[Elecraft] K3S fsk with usb

[Larry (K8UT)]

This thread is running parallel to a discussion running on the DXLabs 
reflector today, due to the release of a new MMTTY FSK interface to 
TinyFSK programmed by Oba JA7UDE. I'll apologize in advance for 
inserting the following:

""""
I'd like to avoid having my response drag this thread into the perpetual 
debate about AFSK versus FSK RTTY.

However, if you already know that you prefer RTTY via FSK there has been 
a secondary argument about whether a RTTY application that is dependent 
on the interrupt/event timing characteristics of Windows can produce 
high fidelity FSK RTTY. Many (myself included) believe that the best 
RTTY FSK signals can be achieved by "outsourcing" RTTY timing to a 
separate processor -- which is exactly what TinySK achieves by running 
on an external Arduino board.

Then the problem becomes "well, can my RTTY program (MMTTY in this case) 
talk to a TinyFSK board?" Up until now MMTTY operating stand-alone had 
no interface to TinyFSK. This new modem definition file from Oba JA7UDE 
provides that interface. For users of other logging programs (like N1MM, 
DXLabs WinWarbler) where the developers had previously written 
work-arounds that could interface from MMTTY to TinyFSK, this work by 
JA7UDE may simplify the plumbing and configuration of a TinyFSK 
connection.

Finally, the last question becomes "well, what do I need to get this 
working?" If you google "tinyfsk by K0SM" you will see many websites 
(selfishly -- including my own www.mortty.info/mortty ) devoted to 
connecting your PC's USB port to an Arduino board with supporting 
hardware.
""""

Additionally, Joe W4TV added that there are commercial devices available 
from several companies, most notably microHAM, which also "outsource" 
FSK RTTY timing to their external processors.

-larry (K8UT)

------ Original Message ------
From: "brian" <alsopb at comcast.net>
To: elecraft at mailman.qth.net
Sent: 2018-08-30 15:35:32
Subject: 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 
>>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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