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<p>27dB is 500 times, not 1000. Only half an S point in it, but...</p>
<p>As Bill Vodal suggested, one of the JT modes (Jt9 is very
narrowband too) could be good. But frequency stability is a
significant requirement for some of them as a result of the narrow
band factor, and long transmission time..</p>
<p>73.</p>
<p>Dave G0WBX<br>
</p>
<br>
<div class="moz-cite-prefix">On 10/10/16 18:00,
<a class="moz-txt-link-abbreviated" href="mailto:aprssig-request@tapr.org">aprssig-request@tapr.org</a> wrote:<br>
</div>
<blockquote cite="mid:mailman.0.1476118801.26573.aprssig@tapr.org"
type="cite">
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<div class="headerdisplayname" style="display:inline;">Subject:
</div>
[aprssig] APRS-WSPR APRS from anywhere!</td>
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<div class="headerdisplayname" style="display:inline;">From:
</div>
Robert Bruninga <a class="moz-txt-link-rfc2396E" href="mailto:bruninga@usna.edu"><bruninga@usna.edu></a></td>
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<div class="headerdisplayname" style="display:inline;">Date:
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09/10/16 20:20</td>
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<div class="headerdisplayname" style="display:inline;">To:
</div>
TAPR APRS Mailing List <a class="moz-txt-link-rfc2396E" href="mailto:aprssig@tapr.org"><aprssig@tapr.org></a></td>
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<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 moz-do-not-send="true"
href="http://aprs.org/aprs-wspr.html">http://aprs.org/aprs-wspr.html</a><br>
<br>
</span></div>
Lets get those WSPR boards on the air!<br>
<br>
</div>
Bob, WB4APR</div>
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