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On 5/10/2012 1:35 PM, Andrew Rich wrote:
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<div><font face="Arial" size="2">Is PSK31 popular for APRS ?</font></div>
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<div><font face="Arial" size="2">- Andrew -</font><br>
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<br>
Not PSK31, but PSK63 (twice the speed) <b>is</b> used with a
dedicated sound card application "APRS Messenger". See my
web page at <br>
<br>
. <a class="moz-txt-link-rfc2396E" href="http://wa8lmf.net/APRS_PSK63"><http://wa8lmf.net/APRS_PSK63></a> <br>
<br>
for details. This is used primarily on the 30 meter-band at
10.149.700 -- two hundred Hz above the upper tone for
classic AX.25 packet-based APRS. <br>
<br>
(FSK tone pair for 300 baud AX.25 HF packet APRS is 10.149.200
Mhz / 10.149.4500 Mhz.) The two systems are so close that
they can be received simultaneously in the passband of a normal
HF/SSB rig. In fact I am receiving both modes at once through a
500 Hz CW filter on USB on my TS-440, with the passband tuning
cranked way high to pass the audio range from 1600 Hz to 2100
Hz. <br>
<br>
<br>
The APRS Messenger app is a combination of a PSK/GMSK sound card
soft TNC, an APRS messaging client and an igate/digipeater
function in a single program. It doesn't do mapping itself, but
can be linked via TCP/IP to any normal APRS client such as
APRSis32, UIview, APRSpoint, etc for mapping displays. <br>
<br>
Note that the APRS Messenger program encapsulates a typical APRS
payload with standard packet-style headers and checksum before
modulating the PSK or GMSK carrier. As a result, normal PSK
programs such as Digipan or MixW can't inter-operate with APRS
Messenger. At the current time, Messenger can only talk with
other copies of itself. However it is incredibly more
effective on weak noisy bands than classic 300-baud HF AX.25
packet. Igates are already operating in North America and
Europe for this new mode, but I don't know about AU and NZ. <br>
<br>
<br>
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--<br>
<br>
Stephen H. Smith wa8lmf (at) aol.com <br>
Skype: WA8LMF<br>
Home Page: <a class="moz-txt-link-freetext" href="http://wa8lmf.net">http://wa8lmf.net</a><br>
<br>
<br>
High-Performance Software-Only Packet TNC <br>
<a class="moz-txt-link-freetext" href="http://wa8lmf.net/miscinfo/UZ7HO-Soundmodem-Install-Ver-0.44-Beta.exe">http://wa8lmf.net/miscinfo/UZ7HO-Soundmodem-Install-Ver-0.44-Beta.exe</a><br>
<br>
High Quality Calibrated Static Maps for Any APRS App <br>
<a class="moz-txt-link-freetext" href="http://wa8lmf.net/aprs/PM9_StatiicMap_Export.htm">http://wa8lmf.net/aprs/PM9_StatiicMap_Export.htm</a><br>
<br>
Vista & Win7 Install Issues for UI-View and Precision
Mapping<br>
<a class="moz-txt-link-freetext" href="http://wa8lmf.net/aprs/UIview_Notes.htm#VistaWin7">http://wa8lmf.net/aprs/UIview_Notes.htm#VistaWin7</a><br>
<br>
<br>
"APRS 101" Explanation of APRS Path Selection & Digipeating
<br>
<a class="moz-txt-link-freetext" href="http://wa8lmf.net/DigiPaths">http://wa8lmf.net/DigiPaths</a> <br>
<br>
<br>
<br>
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