Re: LF: Keyboard Modes for 600 Meters

[John Andrews <w1tag@w1tag.com>]

Graham,

> I don't think I got round to  running those  two, they are coded in 
> multipsk  , but from experience 'wide' systems didn't appear to  travel 
> very well on 500 . The systems that I listed are simple  on/off change 
> state , which could be modulated by simple carrier frequency switching ,
We've had decent results with the MFSK stuff, much better than with any 
of the non error-corrected modes that run at reasonable speed for a 
chat. But a sound card and SSB exciter is needed unless you want a 
substantial DDS programming project. As you say, all of these modes were 
designed for HF lunchbox use with SSB and linearity assumed.
John A.