1. A mode that is the most robust possible within a given BW. Ideally 
several adjustments with the mode so you can fit in different BW's. 
Right now that seems to be Olivia

2. An ARQ mode that has great speed under good conditions and drops back 
to meet ionospheric conditions as needed. Not yet really available for 
sound cards as the ARQ version of PSK63 is not adaptive.  Pactor type 
modes come closest.

3. A casual chat mode that is still pretty good and has narrow BW. 
Probably the man reason for PSK31.

73,

Rick, KV9U



obrienaj wrote:

> What if you could have only 3 digital modes , what would they be?
>
> I would pick
>
> Olivia
> RTTY
> PSK31
>
> Andy K3UK
>



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