Re: K3 RTTY MODE

Posted by K1LI on Mar 23, 2009; 8:16pm
URL: http://elecraft.85.s1.nabble.com/K3-RTTY-MODE-tp2522284p2523233.html

Don,

I am a "digital mode neophyte." Is it possible - or, is it considered to be
too much of a kludge - to receive a digital mode (be it PSK or RTTY) via PC
soundcard and send CW to the K3 for translation into the digital mode? It
seems that this would avoid some of the pitfalls associated with using a PC
to generate "radio quality" audio. Do you know if any of the popular
programs does this?

Thanks,

Brian K1LI

On Mon, Mar 23, 2009 at 3:25 PM, Don Wilhelm <[hidden email]> wrote:

> Dick,
>
> Rather than using SSB mode for data, use the DATA modes, it is less
> troublesome and compression is set to zero automatically..
> Use DATA A mode for soundcard digital modes, or AFSK A for soundcard
> RTTY.  See page 31 of the K3 manual.  With good carrier balance, an AFSK
> signal is equal to an FSK signal.  The K3 AFSK A data mode sets the mark
> frequency in the VFO (rather than the carrier frequency), and allows use
> of the dual passband filter which is designed for RTTY use.
> The narrow roofing filters and the full range of DSP filters can be used
> for DATA modes if you configure the narrow filters for receive in that
> mode.  Transmit must always use the 2.7 or 2.8 kHz filters, but the K3
> figures out the arithmetic involved.
>
> If you wish to use the FSK input to the K3, you will have to provide a
> level translation and drive the FSK input on the ACC connector.  MMTTY
> has methods of activating the FSK input.
>
> 73,
> Don W3FPR
>
> Richard W. Solomon wrote:
> > Does anyone have any idea when they will upgrade to Keyboard operation
> > for RTTY ? Now, I mean using real FSK, not this sound card AFSK stuff.
> >
> > In some radios, AFSK requires you to use the SSB mode, which does not
> > allow filter selection. The Yaesu does.
> >
> > 73, Dick, W1KSZ
> >
> >
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