[aprssig] APRS-WSPR APRS from anywhere!

spam8mybrain spam8mybrain at yahoo.com
Wed Oct 12 14:58:26 CDT 2016


So is there any way to send anything else useful with this? You know, a free-text comment, an APRS symbol code, etc. 
I have to admit, I'm not much of a contester. If I contact someone, I want to be able to pass more information than just "contact made/confirmed". So how can WSPR or WSJT transport useful information for, say, an EmComm situation? Even APRS text messages can transport a reasonable amount of data over and above "contact made".
Andrew, KA2DDO 

-------- Original message --------
From: Robert Bruninga <bruninga at usna.edu> 
Date: 10/10/16  11:21 PM  (GMT-05:00) 
To: Cory Vickruck <crvickru at lakeheadu.ca> 
Cc: TAPR APRS Mailing List <aprssig at tapr.org>, Earl Needham <earl.kd5xb at gmail.com> 
Subject: Re: [aprssig] APRS-WSPR APRS from anywhere! 


The total data is 55 bits. 7 for power, 15 for grid and 23 for callsign.
bob

On Mon, Oct 10, 2016 at 9:42 PM, Cory Vickruck <crvickru at lakeheadu.ca> wrote:
So from what I gathered you can send 22 characters total which includes the callsign and grid square?

On Mon, Oct 10, 2016 at 7:48 PM, Robert Bruninga <bruninga at usna.edu> wrote:
Good point.  APRS WSPR would be like most APRS bulletins and status..  Directed to ALL.
But I think I will work on a simply possible QSO token.  A sender asking for a reply would include a QSO token in his message and then the resposner could use that token instead of a full call.

Bob


On Mon, Oct 10, 2016 at 1:52 PM, crvickru <crvickru at lakeheadu.ca> wrote:
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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