[Elecraft] RTTY vs PSK for DATA A question K3

[Joe Subich, W4TV]

 > If you have the K3 in DATA A mode does it matter.  Once you tune into
 > the signal and my system decodes I would suspect that I am fine.

If you are using DATA A for RTTY you will likely find the signals are
"upside down" (reversed) unless your software compensates.  Most RTTY
software expects the lower audio tone to me MARK - which is correct
for normal LSB FSK.

The other issue with DATA A (USB) is that the display (dial) frequency
will be the suppressed carrier - not the actual RTTY frequency which
will be "VFO + MARK TONE (the higher of the two tones)"

73,

    ... Joe, W4TV


On 4/22/2012 7:59 AM, goldtr8 at charter.net wrote:
>
> Dear Group,
>
> RTTY is supposted to be LSB and PSK on USB.
>
> If you have the K3 in DATA A mode does it matter.  Once you tune into
> the signal and my system decodes I would suspect that I am fine.
>
>   From what my brain is telling me is that a RTTY signal that is posted
> if you are in DATA A and its in USB then all I need to do is turn lower
> in FRQ to find the signal and all shoud be good.
>
> What am I missing if anything with the RTTY.   Will it have a big effect
> on RX decode or TX to someone else.
>
> The reason that I am asking is I just realized the LSB issue yesterday
> and now I am thinking that may be part of my problem where I have poor
> RTTY decode and ability to make weak contacts.    Other digital modes
> like PSK and JT65 work just fine with the system.
>
> I am using the HRD suite of software with DM780 in case that matters.
>
> Otherwise everything works fine, so its more of an education issue for
> operator not a K3 problem.
>
> Cheers have a great weekend.
>
> Don
>
> ~73
> Don
> KD8NNU
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