[GreenKeys] KPH RTTY On Line

[kn7sfz]

Thanks Richard,

I can see  your AFSK scenario being a problem using standard RTTY 170 
split, but perhaps at 850 or higher, the mark would be easier to ignore, 
especially with a 500hz CW filter.  The brain is a master at blocking 
nearby QRM....grey matter DSP!

Not sure what your capabilities are at the station  or your bandwidth 
limitations.

Richard kn7sfz


On 11/7/2020 10:08 AM, Richard Dillman wrote:
>
>
> On Thu, Nov 5, 2020 at 8:20 PM kn7sfz <kn7sfz at gmail.com 
> <mailto:kn7sfz at gmail.com>> wrote:
>
>     And for those of us who like CW as well as RTTY, it might be fun
>     to copy some streaming KPH Morse!...
>
>     (hope I don't get in trouble for this...hi hi)  😁
>
>     Kn7sfz
>
>
> You're not in trouble with me!
>
> But for remote Morse keying of the transmitters we quickly found that 
> an on/off tone would not cut it.  Thus one of our guys engineered and 
> built modern equivalents of the send and receive tone sets originally 
> used a KPH which employ AFSK.
>
> Reading AFSK Morse by ear turns out to be remarkably difficult.  It's 
> like one of those visual illusion drawings where first you see one 
> thing, then the other.  At some point the brain may lock on the mark 
> tone and the Morse jumps out at you.  But at another point the brain 
> may lose that lock and you find yourself trying to copy reverse Morse!
>
> Regards,
>
> RD
>
> =========================
> Richard Dillman
> Inverness Ridge, CA
> =========================

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