[aprssig] APRS-WSPR APRS from anywhere!

crvickru crvickru at lakeheadu.ca
Mon Oct 10 12:52:48 CDT 2016


I am currious about the messaging aspect of this technique. How would yoy encode the destination of the message?


Sent from my Samsung Galaxy smartphone.
-------- Original message --------From: Earl Needham <earl.kd5xb at gmail.com> Date: 2016-10-10  10:42 AM  (GMT-05:00) To: Robert Bruninga <bruninga at usna.edu> Cc: TAPR APRS Mailing List <aprssig at tapr.org> Subject: Re: [aprssig] APRS-WSPR APRS from anywhere! 
For many years, I've suggested using high speed CW.  You could then use just about any amateur radio frequency.  WSPR might have better decode, but CW is the "old stand by".
Vy 7 3EarlKD5XB
On Sun, Oct 9, 2016 at 1:20 PM, Robert Bruninga <bruninga at usna.edu> 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



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