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--- rtl_sdr_aprs_igate [2023/02/20 23:27] – created 2e0sip
+++ rtl_sdr_aprs_igate [2023/02/22 21:24] (current) – 2e0sip
@@ Line 1: / Line 1: @@
 ====== Creating an APRS iGate with an RTL-SDR and Dire Wolf ======
+**This is not finished yet, don't use!**
 It's possible to create an APRS iGate using a relatively cheap RTL-SDR "dongle". As is common with SDRs they don't perform quite as well as a real radio, but they're a versatile tool that's worth having in the shack.
@@ Line 9: / Line 11: @@
 ===== Installation =====
+Install the required packages:
-sudo apt-get install direwolf rtl-sdr
+  sudo apt-get install direwolf rtl-sdr
+Create a directory for the logs:
+  sudo mkdir /var/log/direwolf
 ===== Configuration =====
-Lorem Ipsum Something
+When using Dire Wolf with an rtl-sdr it's necessary to edit the systemd service to ensure rtl_fm runs and redirect Direwolfs output into journald.
+Open /lib/systemd/system/direwolf.service in your favourite text editor and replace it with the following:
+<code>
+[Unit]
+Description=DireWolf is a software "soundcard" modem/TNC and APRS decoder
+Documentation=man:direwolf
+AssertPathExists=/etc/direwolf.conf
+Wants=network-online.target
+After=sound.target syslog.target network-online.target
+[Service]
+SupplementaryGroups=dialout audio
+ExecStart=/bin/sh -c '/usr/bin/rtl_fm -f 144.8M - | /usr/bin/direwolf -c direwolf.conf -t 0 -r 24000 -D 1 -'
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=direwolf
+[Install]
+WantedBy=multi-user.target
+</code>
+Reload systemd, enable and start Dire Wolf
+<code>
+systemctl daemon-reload
+systemctl enable direwolf
+systemctl start direwolf
+</code>
 ===== Usage =====
-rtl_fm -f 144.8M - | direwolf -c direwolf.conf -r 24000 -D 1 -
+Starting manually:
+  rtl_fm -f 144.8M - | direwolf -c direwolf.conf -r 24000 -D 1 -
+View Dire Wolfs stdout:
+  journalctl -f -u direwolf
+{{tag>[rtl-sdr]}}