Generate Self-Signed SSL Key Pair with OpenSSL
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openssl req -new -newkey rsa:2048 -days 365 -nodes -x509 -keyout key.pem -out cert.pem -sha256
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David Andrzejewski
The Legality of DMR in Amateur Radio
There is a lot of confusion on whether DMR is legal to use in the amateur bands. The short answer is an unequivocal yes. DMR is legal on the ham bands.
DMR Etiquette
I have recently had a number of conversations with new DMR users wondering how to use the network without being impolite to other users, even inadvertently. I thought it would be useful to write this all down for everyone’s future…
Subversion: Revert Previous Commit
To revert to your previous commit in Subversion, you’ll need the current revision number and the previous revision number, then:
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svn update
svn merge -r 756:742 .
svn commit -m "Rolled back to previous commit (r742)"
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KI6WJP’s APRS Weather Lookup Tool
KI6WJP has written a useful APRS-IS service called WxBot. Send a message to it with a single character from your APRS-capable radio or application, and it will respond with a forecast for your location. Here is a video demonstrating its…
Kenwood TM-D710/TH-D72 APRS Queries
One feature of many APRS-capable applications and radios is that they support specially-formatted APRS messages called queries or QRU. When the radio receives this message, the text “Q? ” will flash on the top of the screen. Here are the…
Make Any Printer AirPrint-compatible on FreeBSD
AirPrint is a cool technology, but what if you have printers that aren’t officially supported? Here’s how to make it work. Note that this was done on FreeBSD 10.1. This may work on other operating systems, but package installation and…
OpenTracker USB and Motorola Mobiles
The Argent Data OpenTracker USB is a fully-featured KISS TNC – and it’s one of the least expensive, clocking in at $45 at the time this article was written. If you’re going to build an APRS digipeater or igate, or…
Motorola CDM – No PL/DPL on TX from External Accessory Connector
If you’re trying to interface an external accessory (like a Signalink) to a Motorola CDM via the rear 20-pin connector, and it’s not transmitting PL: Go to “Radio Configuration,” then “Accessory,” then change “Data PTT Audio Source” to “Ext Mic…
Debian Jessie: Run aprx as a service
If you’d like to run aprx as a service on Debian Jessie, use this systemd script (in ):
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[Unit]
Description=Amateur Radio APRS Gateway & Digipeater
Documentation=man:aprx(8)
[Service]
Type=simple
ExecStart=/sbin/aprx -i
# doesn't do any internal reload
#
[Install]
WantedBy=multi-user.target
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