update draft post (packet radio...)
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@ -1,14 +1,16 @@
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---
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title: Packet radio, VARA (FM+HF), Mobilinkd and Digirig on Linux
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title: Packet radio, VARA (FM+HF), Mobilinkd, Digirig and the SignalinkUSB on Linux
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summary: >
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Some basic configuration of my HF and VHF/UHF rigs to participate in the
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Winlink world...
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date: 2024-02-13T22:05:30+01:00
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lastmod: 2024-03-12T05:03:59+0000
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lastmod: 2024-03-23T18:47:43+0000
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categories:
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- amateur-radio
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- computerstuff
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tags:
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- draft_post
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- packet radio
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- vara fm
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- vara hf
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# showBreadcrumbs: true
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# showDate: false
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@ -41,6 +43,13 @@ I guess.
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I've been using a Surface 2 Go for some time (well, a really short time) but ditched it again
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because I wasn't really satisfied with its performance.
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There are several different devices and software solutions to send winlink messages and I
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won't cover all of them. The following examples exist because I own the necessary devices
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and I already have the software to work with them.
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_I would choose the Digirig as my favourite device because it just works every time and it
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also provides a USB soundcard to the computer (like the Signalink)._
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## Digirig
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The Digirig gets controlled with `rigctld` -- I use different models for the
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@ -55,11 +64,18 @@ HF and the FM rig -- but the rig configuration is the same for both:
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},
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~~~
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That part of the pat configuration makes sure that pat can transmit with the radio.
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### Packet radio
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Using <kbd>AX.25+agwpe</kbd> within pat in combination with Direwolf -- but
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this combination felt a bit slow (which might only be my subjective opinion).
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Someone might want to tune direwolf for better throughput or more reliable connections,
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but I'm not a direwolf expert and I rarely use it in favour of VARA FM.
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Besides that, I never used packetradio on HF yet. (300bps)
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~~~json
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"ax25": {
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"engine": "linux",
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@ -110,6 +126,8 @@ with the program `alsamixer` (<kbd>F6</kbd> to select the USB soundcard,
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then <kbd>F5</kbd> to list all devices, disable _Auto Gain Control_ with <kbd>m</kbd>
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(mute)).
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Direwolf handles the PTT via the RTS line of the Digirig.
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### VARA FM
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The corresponding configuratoin in the pat config file:
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@ -167,14 +185,20 @@ Back to the TX-500, the pat configuration looks like:
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I start rigctld like:
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~~~console
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$ rigctld -m 2014 -r /dev/ttyUSB0 -d /dev/ttyUSB0 -p /dev/ttyUSB0 -P RTS -s 9600 -vvvv
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$ rigctld -m 2050 -r /dev/ttyUSB0 -d /dev/ttyUSB0 -p /dev/ttyUSB0 -P RTS -s 9600 -vvv
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~~~
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Untested, untested...
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This is for the CAT protocol <kbd>Lab599</kbd>. If you use the older implementation
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(<kbd>Kenwood TS-2000</kbd>) start rigctl with the proper model:
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~~~console
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$ rigctld -m 2014 -r /dev/ttyUSB0 -d /dev/ttyUSB0 -p /dev/ttyUSB0 -P RTS -s 9600 -vvv
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~~~
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## Mobilinkd
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The Mobilinkd TNC4 is a KISS TNC and does not provide a USB soundcard.
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I will use <kbd>AX.25+linux</kbd> in pat with the TNC4 paired via Bluetooth.
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First of all, power on the TNC4 and pair it -- I use _blueman-manager_ for this.
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@ -232,6 +256,11 @@ To de-attach the KISS interface we need to kill the process by:
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$ sudo kill $(pgrep kissattach)
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~~~
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## Signalink USB
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I haven't used this now for a while, but I wanted to include this in this list,
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as it provides a USB soundcard to the computer just like the Digirig does.
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## Some systemd unit-file examples
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Put them into `$HOME/.config/systemd/user`. I created them at the
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@ -240,8 +269,7 @@ start the webgui at boot - the other stuff I start with scripts or
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I search the command history (autocomplete) in my shell.
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I don't even let pat listen to something because this is my main laptop
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and I like the services started in a terminal window where I actually can
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see some output when running.
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and I like the services started in a terminal window.
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### pat
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@ -270,7 +298,7 @@ Before=pat.service ardopc.service
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[Service]
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Type=simple
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; -m 2005 for Lab500 TX-500 CAT protocol
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; -m 2050 for Lab599 TX-500 CAT protocol
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; ExecStart=/usr/bin/rigctld -m 2050 -r /dev/ttyUSB0 -p /dev/ttyUSB0 -P RTS -s 9600 -vvvv
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; -m 2014 for Kenwood TS-2000 CAT protocol
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; ExecStart=/usr/bin/rigctld -m 2014 -r /dev/ttyUSB0 -p /dev/ttyUSB0 -P RTS -s 9600 -vvvv
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@ -281,7 +309,7 @@ TimeoutSec=10
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WantedBy=default.target
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~~~
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You can change the used protocol (_Kenwood TS-200_ or _Lab599 TX-500_l for CAT control within
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You can change the used protocol (<kbd>Kenwood TS-2000</kbd> or <kbd>Lab599 TX-500</kbd> for CAT control within
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the menu on the TX-500 (last menu setting)).
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### ardopc
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@ -302,3 +330,79 @@ TimeoutSec=10
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WantedBy=default.target
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~~~
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Maybe `hw:…` works better, but I had less trouble when using `plughw:…`.
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## Decoding other stations
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### APRS
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#### With direwolf
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This also sends a beacon and the received stations to APRS-IS. You can watch it on
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<https://aprs.fi>.
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~~~console
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$ rtl_fm -M fm -f 144.8M -p 36 -s 24000 -g 42 - | direwolf -c sdr-1200bps.conf -r 24000 -D 1 -B 1200 -
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~~~
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The direwolf configuration:
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~~~squid
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ACHANNELS 1
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ADEVICE null null
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CHANNEL 0
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MYCALL {callsign}
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IGLOGIN {callsign} {passcode}
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IGSERVER rotate.aprs2.net
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MODEM 1200
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AGWPORT 8000
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KISSPORT 8001
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PBEACON sendto=IG delay=0:30 every=30:00 symbol="igate" overlay=R lat=X long=Y alt=in_meter comment="144.8MHz Receive-only gateway AFSK 1200bps"
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IGTXLIMIT 6 10
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~~~
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#### With multimon-ng
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~~~console
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$ rtl_fm -f 144.8M -g 42 -s 22050 -l 20 - | multimon-ng -t raw -a AFSK1200 -
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~~~
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#### With sdrangel
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### Packet radio
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#### With direwolf
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~~~console
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$ rtl_fm -f 144.950M -M fm -s 200000 -r 32000 -g 35 | direwolf -n 1 -r 32000 -b 16 -t 0 -
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~~~
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~~~console
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$ rtl_fm -M fm -f 144.950M -s 22050 | direwolf -n 1 -r 22050 -b 16 -
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~~~
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#### With multimon-ng
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#### With sdrangel
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### VARA HF
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We can only decode with VARA HF in monitor mode.
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### POCSAG
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#### With direwolf
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#### With multimon-ng
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~~~console
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$ rtl_fm -M fm -f 438.025M -s 22050 | multimon-ng -t raw -a POCSAG512 -a POCSAG1200 -a POCSAG2400 -a FLEX -f alpha -
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~~~
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#### With sdrangel
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