[aprssig] APRS-WSPR APRS from anywhere!

Heikki Hannikainen hessu at hes.iki.fi
Sun Oct 9 14:34:52 CDT 2016


The high-altitude balloon folks are already sending balloons with WSPR 


On Sun, 9 Oct 2016, Robert Bruninga wrote:

> The more I think about it the more I get excited about building up an 
> APRS-WSPR Gateway system.  With the 27 dB signal processing gain of WSPR, 
> then a 1W transmitter is
> the same as 1000 watts.  And for receive, since APRS can have HF receivers 
> everywhere, then this can really expand the usefulness of APRS anywhere in 
> the world including
> on the fringes of our existing network.
> QST in September showed the $29 TAPR WSPR daughter board that plugs onto a 
> Rasberry pi and although it is only a 100 millliwatt transmitter, with enough 
> WSPRgates, that
> should not be a problem.  But adding a 1W PA will always help!
> I already have come up with a compression technique that can improve on the 
> existing gridsquare (60x120miles) down to (18x12miles) and down to 3 miles or 
> nearly a half
> mile for 5 and 4 letter calls.
> see http://aprs.org/aprs-wspr.html
> Lets get those WSPR boards on the air!
> Bob, WB4APR

   - Hessu

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