[Elecraft] P3

[Phil Hystad]

Years ago, back in the mid-1970s I worked on a signal processing project for the government.  We produced spectrograms which are used for the same purpose as waterfall displays.  We produced spectrograms on (then) very expensive RAMTEK color graphic displays and also printed on paper.  My role though was not the signal processing, I worked on the software for the display and device drivers for the special spectrogram printers.

73, phil, K7PEH


On Feb 16, 2010, at 9:56 AM, Kok Chen wrote:

> 
> On Feb 16, 2010, at 2/16    8:33 AM, Julian, G4ILO wrote:
> 
>> PSK31 was invented by G3PLX and there was a waterfall in
>> his reference implementation of the mode, psk31sbw.exe.
> 
> I stand corrected.
> 
> 73
> Chen, W7AY
> 
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