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KB5ILY - Travis W. Burton wrote:
<blockquote cite="mid:20090206175857.G44986@lambe.pair.com" type="cite">
<pre wrap="">Maybe I haven't noticed it in the past, but I have noticed several new stations
inserting a space between CALL and an SSID. Plus the SSID is one or two
letters rather than numbers. Only one example of this in my stations list
would be:
NT5RN A
NT5RN B
NT5RN C
NT5RN AB
NT5RN-B
NT5RN-C
Is space a valid character per the spec ?
</pre>
</blockquote>
<br>
<br>
APRS is an application layered on top of the 30+ years old AX-25 packet
radio protocol and standard. <br>
<br>
For *<b>RF</b>* operation, the SSID format MUST conform to the
underlying AX-25 standard, and be a hyphen and number between 0 and
15. [The packet standard only provides a single 4-bit nibble for the
SSID field, meaning only 0000 through 1111 ( binary equivalent of 0 to
15 decimal) will work.] <br>
<br>
APRS *<b>Internet</b>* operation is NOT constrained by the limitations
of AX-25 and the packetizers/de-packetizers in TNCs. (You are just
passing strings of text through a Telnet connection to an Internet
server.) Any arbitrary characters can be placed in the SSID field,
-IF- you don't want the packet to be gated to RF. <br>
<br>
For example the three instances of UIview in my ham server setup that
receive-only off RF, and never transmit, use the "fake" SSIDs of
WA8LMF-16, -17 and -18 to conserve the "real" SSIDs for on-air RF use.
The fourth instance of UIview which does transmit on RF uses -15.<br>
<br>
<hr size="2" width="100%"><br>
--<br>
<br>
Stephen H. Smith wa8lmf (at) aol.com <br>
EchoLink Node: WA8LMF or 14400 [Think bottom of the 2M band]<br>
Skype: WA8LMF<br>
Home Page: <a class="moz-txt-link-freetext" href="http://wa8lmf.com">http://wa8lmf.com</a> --OR-- <a class="moz-txt-link-freetext" href="http://wa8lmf.net">http://wa8lmf.net</a><br>
<br>
World Digipeater Map<br>
<a class="moz-txt-link-freetext" href="http://wa8lmf.net/APRSmaps">http://wa8lmf.net/APRSmaps</a><br>
<br>
JavAPRS Filter Port 14580 Guide <br>
<a class="moz-txt-link-freetext" href="http://wa8lmf.net/aprs/JAVaprsFilters.htm">http://wa8lmf.net/aprs/JAVaprsFilters.htm</a><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>
Updated "Rev H" APRS <a class="moz-txt-link-freetext" href="http://wa8lmf.net/aprs">http://wa8lmf.net/aprs</a><br>
Symbols Set for UI-View, <br>
UIpoint and APRSplus:<br>
<br>
<br>
<br>
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