[Elecraft] K3 RTTY setup with MMTTY

[Richard Ferch]

Hi Dave,

For sound card digital modes other than RTTY, you use the K3's DATA A mode.
This does not require a serial port connection for keying - it transmits
signals based on the audio from the sound card. For RTTY, you can do AFSK
RTTY the same way, i.e. with an audio connection, although there is a
different data sub-mode on the K3 called AFSK A that is specifically
optimized for RTTY. Both of these modes will work with a single serial port
connected to the radio's RS-232 jack for radio control, plus a pair of audio
cables between the sound card LINE IN and LINE OUT jacks and the K3's LINE
OUT and LINE IN jacks. That's all the interface you need.

If you insist on using FSK for RTTY instead of AFSK, then yes, you need
another port to do your FSK keying from, and unlike CW this port cannot be
the same one that you use for radio control (frequencies, etc.). You will
most likely need a one-transistor switch to convert the output from the port
to TTL level for input to the K3's ACC connector.

For getting started in digital modes, you can forget all about FSK and just
get your feet wet with AFSK. AFSK RTTY is perfectly compatible with FSK
RTTY, so you will not be missing anything.

73,
Rich VE3KI


-----Original Message-----
From: Dave Yarnes [mailto:w7aqk at cox.net] 
Sent: January 6, 2009 1:50 AM
To: Richard Ferch; elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 RTTY setup with MMTTY


Hi Richard and All,

O.K.  Since I'm just getting into this digital stuff, I'm not afraid to ask 
a dumb question.   Does what you say mean that I cannot use Ham Radio 
Deluxe, plus its associated program digital master 780, to both control my 
K3, as well as send and receive digital modes like PSK31 or RTTY?  I think i

can receive these modes with just the one serial port connection, but not 
sure about sending.

Dave W7AQK


----- Original Message ----- 
From: "Richard Ferch" <ve3iay at storm.ca>
To: <elecraft at mailman.qth.net>
Sent: Monday, January 05, 2009 7:12 PM
Subject: Re: [Elecraft] K3 RTTY setup with MMTTY


> Ralph K1ZZI wrote:
>
>> I only use one serial port here running FSK/MMTTY under N1MM and it
> controls my K3 perfect (FSK D).
>
> What do you mean by "controls", Ralph? Can you change frequency from 
> the computer? Does N1MM have frequency information from the radio?
>
> If so, I would love to know how you are getting the FSK data to be 
> transmitted to the radio without using another port (either another 
> serial port, or maybe a parallel port using EXTFSK).
>
> If not, and the only radio control you have is PTT and FSK keying (but 
> no frequency control), then you are missing out on some of N1MM 
> Logger's best capabilities and features. The second sentence in the 
> N1MM user manual is: "You really won't be impressed without the radio 
> connected" - that's how important the software's author thinks those 
> features are.
>
> 73,
> Rich VE3KI
>
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