--- title: 'Running the RTL-SDR receiver for APRS IGate on Linux' url: 'https://ra1ahq.blog/en/zapusk-priyomnika-rtl-sdr-dlya-aprs-igate-v-linux' markdown: 'https://ra1ahq.blog/en/zapusk-priyomnika-rtl-sdr-dlya-aprs-igate-v-linux.md' lang: en date: '2025-06-05' description: 'Continued articles. This time I added DireWolf for APRS to RTLSDR. Initial data Transmitting side (walkie-talkie) Baofeng UV-5r *AP' taxonomy: archives_month: - jun_2025 archives_year: - '2025' --- # Running the RTL-SDR receiver for APRS IGate on Linux 5 June 2025 ![Running the RTL-SDR receiver for APRS IGate on Linux](https://ra1ahq.blog/images/e/f/a/4/d/efa4dfc5897be02f9817d3393d267b2f5367006f-aprs.webp)17:23 ### Running the RTL-SDR receiver for APRS IGate on Linux 5 June 2025 17:23 Continued [articles](https://ra1ahq.blog/en/zapusk-priyomnika-rtl-sdr-i-gqrx-v-linux). This time I added DireWolf for APRS to RTLSDR. ### Initial data #### Transmitting side (walkie-talkie) - Baofeng UV-5r \*APRS K-1 cable - smartphone \*APRSdroid #### Receiving side (stationary personal computer - IGate) \*Linux Mint 21.3 - ezcap RTL-SDR - rtl\_fm - DireWolf ### Using the rtl\_fm console utility and the aplay command to receive FM radio The rtl\_fm utility allows you to transfer the result of audio demodulation to stdout. The rtl\_fm command is included in the rtl-sdr package (previously installed). But to play, you need to use a separate aplay command from the alsa-utils package, which works with “raw” data. Pipeline data at 128k sample rate ``` rtl_fm -M wbfm -f 87.5M -r 96k - | aplay -c 2 -r 48000 -f S16_LE ``` where -M wbfm - modulation -f 87.5M - частота -r 48k - частота дискретизации выходного "сырого" потока -o 4 - Oversampling output by: 4x. \- - - вывод в stdout -c 2 - число каналов - стерео -r 48000 - частота дискретизации выходного файла -f S16\_LE - формат входных данных Stereo for WFM: ``` rtl_fm -M wnfm -f 87.5M -s 220k -r 96k -A std -F 2 | aplay -c 2 -r 48000 -f S16_LE ``` Mono (much less noise): ``` rtl_fm -M wnfm -f 87.5M -s 220k -r 48k -A std -F 2 | aplay -c 1 -r 48000 -f S16_LE ``` where -s 220k - частота дискретизации по входу -r 48k - частота дискретизации данных по выходу -A std - режим расчёта atan -F 2 - улучшенный режим FIR -c 1 - один канал [ ![console](https://ra1ahq.blog/images/4/8/f/4/6/48f46e040e1c71b16ca4a78c4e6d18eefa59ea4d-console.png "console")](https://ra1ahq.blog/images/4/8/f/4/6/48f46e040e1c71b16ca4a78c4e6d18eefa59ea4d-console.png) ### Narrowband frequency modulation (NBFM) demodulation To receive narrowband FM, you need to modify the command line parameters. For output to a sound card, frequency 432.500 MHz for APRS: ``` rtl_fm -M fm -f 432.5M -r 24000 - | aplay -c 1 -r 24000 -f S16_LE ``` ### Transferring audio from rtl\_fm to Direwolf for APRS #### Installing DireWolf on Linux Since the repository contains the latest version of DireWolf 1.6, I did not compile it, but installed it from the Linux Mint repository. ``` sudo apt-cache showpkg direwolf sudo apt install direwolf ``` #### Setting up DireWolf 1\) Copy /etc/direwofl.conf to the working folder ~/direwolf,conf 2\) Correction of the ADEVICE line in the ~/direwolf.conf file to **null null** ![direwolf_conf](https://ra1ahq.blog/images/b/a/7/1/e/ba71e5abb4655fd25d0aadbfc1813954fa079f24-direwolfconf.png "direwolf_conf") 3\) Dire Wolf launch line with audio transmission from rtl\_fm (for APRS decoding) ``` rtl_fm -M fm -f 432.5M -r 24k - | direwolf -c ~/direwolf.conf -r 24000 -D 1 -dgit ``` where are the parameters of the rtl\_fm call -M fm - narrowband FM modulation -f 432.5M - reception frequency (or 144.8M for the 2 meter range) -r 24k - sampling rate direwolf call parameters -c ~/direwolf.conf - configuration file indicating ADEVICE call sign -r 24000 - input data sampling rate -D 1 - divide (Divide) the input data into 1 channel (since this is mono, the number is 1) -dgit - debug (-d) the following parameters: "g" - GPS interface, "i" - IGate, "t" - tracking beacon - location tracker, \- - audio input from stdout #### Transmitting and receiving APRS packet On the smartphone I launched APRSdroid (version 1.6.3d) downloaded from the APRSdroid website. In Baofeng, VOX level 1 setting, APRS-K1 cable. On the computer - an SDR USB receiver, where the audio output, after demodulation from RTLSDR using rtl\_fm, is fed through the console to the input of direwolf - an APRS packet decoding program. ### Result The APRS packet was successfully received by RTLSDR and decoded by Dire Wolf. ![igate](https://ra1ahq.blog/images/d/b/3/5/9/db3592230df0ff594d574e732704bb06dd00525d-igate.png "igate") **Sources:** *[Configuring rtl\_fm and Direwolf for decoding Amateur Radio Packet on the Raspberry Pi](https://www.kevinhooke.com/2015/07/26/configuring-rtl_fm-and-direwolf-for-decoding-amateur-radio-packet-on-the-raspberry-pi/)* [Direwolf on a Raspberry Pi with RTL-SDR](https://www.vnutz.com/articles/direwolf_on_a_raspberry_pi_with_rtlsdr) [ Backward](https://ra1ahq.blog/en/zapusk-priyomnika-rtl-sdr-i-gqrx-v-linux "Previuous page") [ Forward ](https://ra1ahq.blog/en/ustranenie-oshibki-finished-record-runlevel-change-in-utmp "Next page") ## Languages - [Русский](https://ra1ahq.blog/posts/zapusk-priyomnika-rtl-sdr-dlya-aprs-igate-v-linux) - 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