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Hi folks,<br>
<br>
So I was giving a presentation and live demo on APRS at the Sierra
Foothills ARC (W6EK) Hamswap today. During the demonstration of one
of the APRS services, I got a reply with an apparently truncated
"from" call sign. The message was from "W-9", instead of KM6LYW-9.
The rest of the message seems fine, as were the other call signs and
messages throughout the presentation. Through the magic of retries,
the message was received again 2 minutes later, from the correct
call sign in that case.<br>
<br>
From my iGate's transmit log, I see the following. I don't have the
corresponding receive log, so can't tell who it came from. This is
from APRSIS32, and shows it going out on RF. In this instance I see
the message was repeated a few times (retries?), and only one of
them had the issue. Problem packet highlighted in bold. My HT is
KO6TH-7, and my iGate is KO6TH (no SSID).<br>
<br>
<tt>2019-03-16T17:38:24.581 Transmit(RF)
KO6TH>APWW10,WIDE2-1:}KM6LYW-9>APRS,TCPIP,KO6TH*::KO6TH-7
:55F(69F/45F) Sunny. Tonight, Clear.{9</tt><tt><br>
</tt><tt>2019-03-16T17:38:25.584 Transmit(RF)
KO6TH>APWW10,WIDE2-1:}KM6LYW-9>APRS,TCPIP,KO6TH*::KO6TH-7
:ack4</tt><tt><br>
</tt><tt>2019-03-16T17:38:55.696 Transmit(RF)
KO6TH>APWW10,WIDE2-1:}KM6LYW-9>APRS,TCPIP,KO6TH*::KO6TH-7
:55F(69F/45F) Sunny. Tonight, Clear.{9</tt><tt><br>
</tt><tt>2019-03-16T17:38:56.745 Transmit(RF)
KO6TH>APWW10,WIDE2-1:}KM6LYW-9>APRS,TCPIP,KO6TH*::KO6TH-7
:ack4</tt><tt><br>
</tt><tt>2019-03-16T17:39:05.402 Transmit(IS+RF)
KO6TH-15>APWW10,WIDE2-1:/161038z3857.54N/12106.64W_000/002g000t060r000p000P000h44b00000</tt><tt><br>
</tt><tt>2019-03-16T17:39:27.801 Transmit(RF)
KO6TH>APWW10,WIDE2-1:}KM6LYW-9>APRS,TCPIP,KO6TH*::KO6TH-7
:ack4</tt><tt><br>
</tt><tt>2019-03-16T17:39:57.813 Transmit(RF)
KO6TH>APWW10,WIDE2-1:}KM6LYW-9>APRS,TCPIP,KO6TH*::KO6TH-7
:55F(69F/45F) Sunny. Tonight, Clear.{9</tt><tt><br>
</tt><tt>2019-03-16T17:40:31.741 Transmit(RF)
KO6TH>APWW10,WIDE2-1:}KM6LYW-9>APRS,TCPIP,KO6TH*::KO6TH-7
:You will be misunderstood by everyone.{10</tt><tt><br>
</tt><tt>2019-03-16T17:40:32.776 Transmit(RF)
KO6TH>APWW10,WIDE2-1:}KM6LYW-9>APRS,TCPIP,KO6TH*::KO6TH-7
:ack5</tt><tt><br>
</tt><b><tt>2019-03-16T17:40:33.452 Transmit(RF)
KO6TH>APWW10,WIDE2-1:}W-9>APRS,TCPIP,W6PKT-5,KO6TH*::KO6TH-7
:You will be misunderstood by everyone.{10</tt></b><tt><br>
</tt><tt>2019-03-16T17:41:02.869 Transmit(RF)
KO6TH>APWW10,WIDE2-1:}KM6LYW-9>APRS,TCPIP,KO6TH*::KO6TH-7
:You will be misunderstood by everyone.{10</tt><tt><br>
</tt><tt>2019-03-16T17:41:03.862 Transmit(RF)
KO6TH>APWW10,WIDE2-1:}KM6LYW-9>APRS,TCPIP,KO6TH*::KO6TH-7
:ack5</tt><tt><br>
</tt><tt>2019-03-16T17:41:35.113 Transmit(RF)
KO6TH>APWW10,WIDE2-1:}KM6LYW-9>APRS,TCPIP,KO6TH*::KO6TH-7
:ack5</tt><tt><br>
</tt><tt>2019-03-16T17:41:35.400 Transmit(IS+RF)
KO6TH>APWW10:;145.430/R*111111z3853.79N/12104.61Wr145.430MHz
T162 -060 NetTh1730 W6EK SFARC Repeater</tt><tt><br>
</tt><tt>2019-03-16T17:42:04.964 Transmit(RF)
KO6TH>APWW10,WIDE2-1:}KM6LYW-9>APRS,TCPIP,KO6TH*::KO6TH-7
:You will be misunderstood by everyone.{10</tt><tt><br>
</tt><br>
I contacted KM6LYW, the author of the service, and he checked his
logs. Everything seems to be in order, so it's apparently happening
somewhere in the intervening infrastructure. Spelunking around
APRS.fi, there are a number of other instances; one another W-9, but
also a W-3, several N-?, K-?, two O-?, a V-?, etc. No commonality
in packet type or such that I can determine. Occurs for two
character SSIDs too (K-10, for example).<br>
<br>
Any idea what's going on here?<br>
<br>
Greg KO6TH<br>
<br>
p.s. The service is at KM6LYW-9. You send it a message with text
"fortune", "weather", "time", etc. and it replies with the
corresponding answer. Fittingly, the message in question was a
daily "fortune" which read: "You will be misunderstood by
everyone." You can't make this stuff up!<br>
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