- Raspberry PI 3B+
- Canakit DCAR-052A5 5V 2.5A micro-USB power supply
- MakerFocus Raspberry Pi Case X002338M49
- SanDisk Ultra microSDXC UHS-I card 64 GB
- DINAH CM119 USB soundmodem/PTT interface
- Vertex Standard VX-4500
- with DE-15 to mini-DIN6 cable (3-row high density DB-15)
- or Kenwood DM-710
- with DINAH supplied mini-DIN6 male to male cable
This code relies on a bunch of really old packages. I've cloned them to make sure they don't dissappear as some of them have already been dropped by Debian-hams and/or their upstream repos have gone missing.
- https://github.com/n2ygk/soundmodem Thomas Sailer's soundcard modem/PTT interface.
- Requires a patch to support DINAH PTT
- https://github.com/n2ygk/aprx Matti Aarnio OH2MQK/Kenneth W. Finnegan W6KWF digipeater (Currently I only use it for APRS-IS igate functionality.)
- https://github.com/n2ygk/aprsdigi My AX.25 APRS RF digipeater.
Everything is configured based on callsign. See install.sh.
To configure and start the aprsdigi:
- Use Raspberry Pi Imager and select:
- Raspberry Pi Device: No Filtering
- OS: Raspberry Pi OS (other)/Raspberry Pi OS Lite (64-bit): Debian Bookworm with no desktop environment.
- Select the CF media to write to.
- Edit options:
- General
- hostname: a simple callsign-SSID
- username/password
- initial bootstrap WiFi LAN
- Services
- Enable SSH w/public-key authentication only
- General
- Boot up with the CF just written and wait for one-time setup.
- ssh in just to make sure. If you can't get in via ssh, use the console and keyboard.
- Either tar up this directory and copy it to the Pi or use git to clone it:
$ ssh n2ygk@n2ygk.local
Linux n2ygk 6.1.0-rpi4-rpi-v8 #1 SMP PREEMPT Debian 1:6.1.54-1+rpt2 (2023-10-05) aarch64
...
Last login: Sun Nov 12 16:11:31 2023 from 192.168.1.154
n2ygk@n2ygk:~ $ sudo -s
root@n2ygk:/home/n2ygk# apt-get update
root@n2ygk:/home/n2ygk# apt-get upgrade -y
root@n2ygk:/home/n2ygk# apt autoremove -y
...
root@n2ygk:/home/n2ygk# apt-get install -y git
root@n2ygk:/home/n2ygk# exit
exit
n2ygk@n2ygk:~ $ mkdir src
n2ygk@n2ygk:~ $ cd src
n2ygk@n2ygk:~/src $ git clone https://github.com/n2ygk/aprspi.git
Cloning into 'aprspi'...
...
n2ygk@n2ygk:~/src $ cd aprspi
Copy the fix-auth.sh script which adds users:
aprspi$ scp fix-auth.sh n2ygk@n2ygk:src/aprspi/
Then pop back on the host and run the install script:
# get a copy of the .deb file from a prior build into ~/src
# or just let the installer patch and rebuild it from source:
n2ygk@n2ygk:~/src/aprspi $ sudo ./install.sh
There will be lines of output with two prompts you have to respond to:
+ ufw enable
Command may disrupt existing ssh connections. Proceed with operation (y|n)? y
...
Please pop out and replug the DINAH usb device then hit enter:
Don't logout yet!
After the installation script finishes, you will only be able to ssh in by having installed ~/.ssh/authorized_keys.
Furthermore, you'll need to set up google-authenticator (answer 'y' to all the questions):
$ google-authenticator
Copy ~/.google_authenticator and install in password store for later recovery.
scp n2ygk@n2ygk:.google_authenticator /tmp/t
pass edit comp/n2ygk/n2ygk
# copy in contents of /tmp/t
pass git push
Depending on random boot order, the DINAH USB soundcard can show up in different slots.
To resolve this, add 95-myusb.rules to /lib/udev/rules.d to symlink /dev/snd/DINAH to the appropriate ControlC* device:
# ls -l /dev/snd/
total 0
drwxr-xr-x 2 root root 60 Nov 14 12:22 by-id
drwxr-xr-x 2 root root 100 Nov 14 12:22 by-path
crw-rw---- 1 root audio 116, 0 Nov 13 17:40 controlC0
crw-rw---- 1 root audio 116, 32 Nov 13 17:40 controlC1
crw-rw---- 1 root audio 116, 64 Nov 14 12:22 controlC2
lrwxrwxrwx 1 root root 9 Nov 14 12:22 DINAH -> controlC2
crw-rw---- 1 root audio 116, 16 Nov 13 17:40 pcmC0D0p
crw-rw---- 1 root audio 116, 48 Nov 13 17:40 pcmC1D0p
crw-rw---- 1 root audio 116, 88 Nov 14 12:22 pcmC2D0c
crw-rw---- 1 root audio 116, 80 Nov 14 12:22 pcmC2D0p
crw-rw---- 1 root audio 116, 1 Nov 13 17:40 seq
crw-rw---- 1 root audio 116, 33 Nov 13 17:40 timer
You can then reference the DINAH in ALSA using the symlinked name:
$ alsactl info /dev/snd/DINAH
#
# Sound card
#
- card: 2
id: Device
name: USB Audio Device
longname: C-Media Electronics Inc. USB Audio Device at usb-3f980000.usb-1.2, full speed
driver_name: USB-Audio
mixer_name: USB Mixer
components: USB0d8c:0012
controls_count: 9
pcm:
- stream: PLAYBACK
devices:
- device: 0
id: USB Audio
name: USB Audio
subdevices:
- subdevice: 0
name: subdevice #0
- stream: CAPTURE
devices:
- device: 0
id: USB Audio
name: USB Audio
subdevices:
- subdevice: 0
name: subdevice #0
And you can go straight to the card in alsamixer:
$ alsamixer -c /dev/snd/DINAH
or use amixer to set levels from the command line.