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" <[email protected]>
To: [email protected]
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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