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Author Topic: EZ Guide to Understanding APRS Raw Packets?  (Read 948 times)
N4SRN
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Posts: 356




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« on: January 28, 2019, 03:31:53 PM »

I’m looking for an EZ Guide to understanding APRS Raw Packets such as seen on APRS.FI raw display options. “EZ” as a write up addressing such a topic rather than referring me to the specification. A Primer, so to speak, for the less technical folks not inclined to get a EE/ComSci double major.  ;-)

Bret/N4SRN
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Bret/N4SRN
Bedford, NH  USA
W4KYR
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Posts: 1798




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« Reply #1 on: January 29, 2019, 05:30:44 AM »

I’m looking for an EZ Guide to understanding APRS Raw Packets such as seen on APRS.FI raw display options. “EZ” as a write up addressing such a topic rather than referring me to the specification. A Primer, so to speak, for the less technical folks not inclined to get a EE/ComSci double major.  ;-)

Bret/N4SRN

Let me add another question to go with your question. Is it possible use "Wireshark" to analyze APRS and Packet Radio Packets? If so, how?
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The internet and cellphone networks are great until they go down, what then? Find out here. 
https://www.eham.net/ehamforum/smf/index.php/topic,111948.0.html

Using Windows 98 For Packet...
VE7KNL
Member

Posts: 29




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« Reply #2 on: January 29, 2019, 05:37:50 AM »

This might help
http://www.aprs.net/vm/DOS/PROTOCOL.HTM
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WD9EWK
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Posts: 658


WWW

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« Reply #3 on: January 29, 2019, 08:47:37 AM »


In addition to this, the aprs.fi site provides a way to decode the raw packets. When you are looking at the raw packets for a station, you will see a drop-down menu that should have "Normal". Change that to "Decoded", and then you see both the raw packet and a breakdown of most of the data in the packet. Here's an example showing position packets and a message...



73!
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Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/ - Twitter: @WD9EWK or http://twitter.com/WD9EWK
N4SRN
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Posts: 356




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« Reply #4 on: January 29, 2019, 09:38:14 AM »

Excellent stuff y’all - thanks!
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Bret/N4SRN
Bedford, NH  USA
KB3VWG
Member

Posts: 141




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« Reply #5 on: January 30, 2019, 07:09:09 AM »

Let me add another question to go with your question. Is it possible use "Wireshark" to analyze APRS and Packet Radio Packets? If so, how?

Yes!

I simply ran Wireshark on the interface that was speaking AX.25. You can also collect pcap files via tcpdump to be read in Wireshark.

Also, a guide on the raw packets: https://www.tapr.org/pub_ax25.html - that is the specification of the protocol.


73,

KB3VWG
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W4KYR
Member

Posts: 1798




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« Reply #6 on: January 30, 2019, 08:01:36 AM »

Let me add another question to go with your question. Is it possible use "Wireshark" to analyze APRS and Packet Radio Packets? If so, how?

Yes!

I simply ran Wireshark on the interface that was speaking AX.25. You can also collect pcap files via tcpdump to be read in Wireshark.

Also, a guide on the raw packets: https://www.tapr.org/pub_ax25.html - that is the specification of the protocol.


73,

KB3VWG

Thanks
Logged

The internet and cellphone networks are great until they go down, what then? Find out here. 
https://www.eham.net/ehamforum/smf/index.php/topic,111948.0.html

Using Windows 98 For Packet...
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