Jim, and all,
Yes, the AFSK A data submode is optimized for RTTY operation. The
default sideband is LSB and the use of the dual filter is possible.
Furthermore, the K3 dial display shows the mark frequency.
If you are using an RTTY mode with an application such as MMTTY, you
will find the AFSK A mode useful and tuning will be done using the K3 VFO.
OTOH, if you are using an application that has a waterfall display and
does point and click on the preferred signal (rather than tuning to the
signal with the K3 VFO), then the use of DATA A in reverse mode will
likely be more useful to you for RTTY - your application may switch
sidebands when RTTY is selected - check the documentation for your
application, it is a 'mixed bag' and some application 'do it right'
without explicit actions by the user while others will require that LSB
be explicitly selected. The frequency display on the waterfall is also
application dependent. Refer to the application documentation to assist
in understanding what is being displayed on both the transceiver
frequency display and on the waterfall.
For data modes other than RTTY, yes, DATA A should be used - it all
depends on the data mode application.
73,
Don W3FPR
On 9/15/2014 10:07 PM, James Bennett wrote:
I've been a PSK31 user just about ever since the mode came to be. Not a heavy
user, but couple time a month I get on and have some nice keyboard QSO's. In
the 50 years that I've been licensed, I have NEVER made a RTTY QSO! However, it
does intrigue me so I started messing with it a little this week.
I recently got a new external sound card for my station - a Tascam US125. It is
connected to my iMac via USB and the K3 via a pair of stereo cables. Works fine
on JT65, JT9, and PSK31. I use WSJT-X for the JT-modes and cocoaModem (CM) for
PSK31. CM also provides RTTY so I gave it a shot. After a few burps I got it
going.
With PSK31 and the JT-modes, I've always had the K3 in DATA-A setting. RTTY "seems" to
work in either DATA-A or AFSK-A. Fred Cady's K3 book states that AFSK-A is "optimized for
RTTY". How? What is the real benefit to switching to AFSK-A mode for RTTY? Is that what
everyone is using, or is DATA-A just as good?
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