<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body>So is there any way to send anything else useful with this? You know, a free-text comment, an APRS symbol code, etc. <div><br></div><div>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".</div><div><br></div><div>Andrew, KA2DDO </div><br><br>-------- Original message --------<br>From: Robert Bruninga <bruninga@usna.edu> <br>Date: 10/10/16 11:21 PM (GMT-05:00) <br>To: Cory Vickruck <crvickru@lakeheadu.ca> <br>Cc: TAPR APRS Mailing List <aprssig@tapr.org>, Earl Needham <earl.kd5xb@gmail.com> <br>Subject: Re: [aprssig] APRS-WSPR APRS from anywhere! <br><br><div dir="ltr"><br><div class="gmail_extra">The total data is 55 bits. 7 for power, 15 for grid and 23 for callsign.<br></div><div class="gmail_extra">bob<br><br></div><div class="gmail_extra"><div class="gmail_quote">On Mon, Oct 10, 2016 at 9:42 PM, Cory Vickruck <span dir="ltr"><<a href="mailto:crvickru@lakeheadu.ca" target="_blank">crvickru@lakeheadu.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">So from what I gathered you can send 22 characters total which includes the callsign and grid square?<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Oct 10, 2016 at 7:48 PM, Robert Bruninga <span dir="ltr"><<a href="mailto:bruninga@usna.edu" target="_blank">bruninga@usna.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Good point. APRS WSPR would be like most APRS bulletins and status.. Directed to ALL.<br></div><div>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.<br><br></div><div>Bob<br></div><div><div><br><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Oct 10, 2016 at 1:52 PM, crvickru <span dir="ltr"><<a href="mailto:crvickru@lakeheadu.ca" target="_blank">crvickru@lakeheadu.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div>I am currious about the messaging aspect of this technique. How would yoy encode the destination of the message?</div><div><br></div><div><br></div><div><br></div><div><div style="font-size:85%;color:#575757" dir="auto">Sent from my Samsung Galaxy smartphone.</div></div><div><br></div><div style="font-size:100%;color:#000000"><div>-------- Original message --------</div><div>From: Earl Needham <<a href="mailto:earl.kd5xb@gmail.com" target="_blank">earl.kd5xb@gmail.com</a>> </div><div>Date: 2016-10-10 10:42 AM (GMT-05:00) </div><div>To: Robert Bruninga <<a href="mailto:bruninga@usna.edu" target="_blank">bruninga@usna.edu</a>> </div><div>Cc: TAPR APRS Mailing List <<a href="mailto:aprssig@tapr.org" target="_blank">aprssig@tapr.org</a>> </div><div>Subject: Re: [aprssig] APRS-WSPR APRS from anywhere! </div><div><br></div></div><div dir="ltr">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".<div><br></div><div>Vy 7 3</div><div>Earl</div><div>KD5XB</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Oct 9, 2016 at 1:20 PM, Robert Bruninga <span dir="ltr"><<a href="mailto:bruninga@usna.edu" target="_blank">bruninga@usna.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div>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.<br><br></div>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!<br><br></div>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.<br><br></div><div>see <span><a href="http://aprs.org/aprs-wspr.html" target="_blank">http://aprs.org/aprs-wspr.html</a><br><br></span></div>Lets get those WSPR boards on the air!<br><br></div>Bob, WB4APR<br><div><br></div></div>
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