Sending spectrum data means you only need to send the new line of data. So 
every second or so, it sends another 1024 data points. With 16 bit integers, 
that would be 2 kbytes, but simple arithmetic coding (lossless compression) 
would reduce that to under a kbyte, or about 8000 bits/s. That is one packet on 
a slow link.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Nov 20, 2017, at 4:50 PM, Richard Ferch <ve3...@gmail.com> wrote:
> 
> Relaying FFT spectrum data to another computer is certainly doable.
> 
> For example, N1MM Logger+ can relay its spectrum display window to other
> instances of N1MM+ over a LAN or the Internet. If you have a copy of N1MM+
> running at the radio site and equipped to display a spectrum window, that
> copy of N1MM+ can relay its spectrum window data to another copy of N1MM+
> running somewhere else. Either copy of N1MM+ can be the one doing the
> actual logging.
> 
> With a K3/K3S, at the radio site you would need an SDR such as the SDRPlay,
> or an LP-PAN plus a good sound card, plus software: Win4K3Suite, or N2IC's
> Waterfall Bandmap program, together with a copy of N1MM+. At the remote
> control site, all you need is N1MM+. See the online documentation for N1MM+
> (the Spectrum Display Window web page) for details.
> 
> 73,
> Rich VE3KI
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