Important: Use only Compass Linux images. They contain support specific to the UDRC™. Source is available for review on GitHub.
During initial startup do not modify the basic Raspberry Pi setup. For example, do not overclock the Raspberry Pi, it is not needed as performance is more than adequate, and doing so can change clocking values on busses used by the UDRC™ causing it to either not function or be unstable. If you make any changes not listed in these instructions, and your UDRC™ does not function, return to the original settings.
- Mount your UDRC™ or UDRC™-II on a Raspberry Pi 2 or 3
- Install Compass Linux
- Basic Configuration
- Install Direwolf
- Running Two Radios on the UDRC™ II
Mount your UDRC™ or UDRC™-II on a Raspberry Pi 2 or 3
Note: Raspberry Pi 3 Addendum
ARMv6 Raspberry Pis are not supported. This includes the A/A+, Zero, Pi 1 B/B+, and Compute Module.
Make sure the pins are properly aligned and use the supplied standoffs to support the board above the HDMI port.
- From a terminal command line, verify that the UDRC™ is
recognized by typing the command
aplay -l(that's a lowercase l) and observe that udrc is listed as a card. If you do not see it listed, power down and remount the UDRC™.
- To preset the pins and levels on the UDRC™ we provide a
script. Execute the following:
cd ~ curl -L -s https://goo.gl/7rXUFJ > set-udrc-din6.sh chmod +x set-udrc-din6.sh sudo ~/set-udrc-din6.sh
- Optionally disable the internal sound chip by editing
/boot/config.txt and commenting out this line (recommended unless you
need it for something else):
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install direwolf
Read the README
Download the User's Guide
Peruse other documents on the WB2OSZ Github for ideas and troubleshooting -- however, you do not need to perform the items in Raspberry Pi document. The UDRC only needs a few edits in direwolf.conf
Use your favorite editor, e.g. nano or vi to edit file direwolf.conf
vi direwolf.conf # or nano direwolf.conf
Set the following parameters (BOLD are specific to your station). Any additional values should be set based on the direwolf User Guide.
PTT GPIO 12
PTT GPIO 12
PBEACON delay=1 every=10 overlay=S symbol="digi" lat=17^51.00N long=102^18.36W power=5 height=20 gain=6 comment="UDRC" via=WIDE1-1,WIDE2-1
DIGIPEAT 0 0 ^WIDE[3-7]-[1-7]$|^TEST$ ^WIDE-$ TRACE
IGLOGIN YOUR INTERNET LOGIN AND PASSCODE FOR APRS REPORTING
PBEACON sendto=IG delay=0:30 every=60:00 symbol="igate" overlay=R lat=17^51.00N long=102^18.36W
IGTXLIMIT 6 10 # if you have GPSD running, uncomment the following line # GPSD localhost
Under CHANNEL 0 -- Choose MODEM (1200 and 9600 for VHF/UHF) and set the PTT to use the GPIO pin
PTT GPIO 12
The modem value under CHANNEL 1 should match the value chosen under CHANNEL 0.
ADEVICE plughw:CARD=udrc,DEV=0 ARATE 48000 ACHANNELS 2 #HD-15 CHANNEL 0 MYCALL YOURCALLSIGN-SSID MODEM 9600 PTT GPIO 12 #DIN-6 CHANNEL 1 MYCALL YOURCALLSIGN-SSID MODEM 1200 PTT GPIO 23 AGWPORT 8000 KISSPORT 8001 PBEACON delay=1 sendto=0 every=10 overlay=S symbol="digi" lat=17^51.00N long=102^18.36W power=5 height=20 gain=6 comment="UDRC 9600" via=WIDE1-1,WIDE2-1 PBEACON delay=1 sendto=1 every=10 overlay=S symbol="digi" lat=17^51.00N long=102^18.36W power=5 height=20 gain=6 comment="UDRC 1200" via=WIDE1-1,WIDE2-1 #DIGIPEAT 0 0 ^WIDE[3-7]-[1-7]$|^TEST$ ^WIDE-$ TRACE #DIGIPEAT 1 1 ^WIDE[3-7]-[1-7]$|^TEST$ ^WIDE-$ TRACE #DIGIPEAT 0 1 ^WIDE[3-7]-[1-7]$|^TEST$ ^WIDE-$ TRACE #DIGIPEAT 1 0 ^WIDE[3-7]-[1-7]$|^TEST$ ^WIDE-$ TRACE IGSERVER noam.aprs2.net IGLOGIN YOUR INTERNET LOGIN AND PASSCODE FOR APRS REPORTING
PBEACON sendto=IG delay=0:30 every=60:00 symbol="igate" overlay=R lat=17^51.00N long=102^18.36W IGTXLIMIT 6 10 #GPSD localhost
Radio and Start Direwolf
Use the Mini Din-6 connector to attach a radio with a 9600 baud packet port. Many radios have a Mini Din-6 socket specifically for this purpose, use a straight through male to male Mini Din-6 cable. If you selected Mini Din-6 when ordering the UDRC, use that cable. If you need a specialized cable to go to another radio, you can build one or see Cable and Connectors on the NW Digital Radio blog.
cd ~ direwolf
The values set by the script should be sufficient, but controls exist in the alsamixer program to adjust LO/PCM (modulation for TX, use LO as the main control) and ADC (receive), after selecting the UDRC as the sound device. Use them judiciously and save changes with the command
sudo alsactl store
You may wish to save the initial script and change the db values you pick in alsamixer.
cd ~Use your favorite editor to modify the new shell script. You can execute it at any time
curl -L -s https://goo.gl/7rXUFJ > my-udrc-setup.sh
chmod +x my-udrc-setup.sh
Note on how to use a RTL-SDR to set deviation.
Many applications can be used with direwolf
sudo apt-get install xastir cd ~ xastir
sudo apt-get install openjdk-7-jre librxtx-java unzip wget cd ~ sudo wget http://www.ka2ddo.org/ka2ddo/YAAC.zip mkdir YAAC cd YAAC unzip ~/YAAC.zip java -jar YAAC.jar
Adding a GPS to your Raspberry Pi is easy and can be made available to various programs like Direwolf, Xaster, and YAAC. These programs typically can take GPS data directly from an attached GPS or use GPSD, a program that makes a GPS data available via a network socket.
In our example we will use a common USB attached GPS, like the reasonably priced GlobalSat BU-353.
Plug the USB GPS into one of the 4 USB ports on your Raspberry Pi. If it is the only serial device it will typically be a /dev/ttyUSB0. If you have other USB serial devices, it may be at some other /dev/ttyUSBx (where x is a digit).
Install gpsd and some clients.
sudo apt-get update
sudo apt-get upgrade #optional
sudo apt-get install gpsd gpsd-clients
Configure gpsd by editing /etc/default/gpsd - for /dev/ttyUSB0 the file will contain
# Default settings for the gpsd init script and the hotplug wrapper.
# Start the gpsd daemon automatically at boot time
# Use USB hotplugging to add new USB devices automatically to the daemon
# Devices gpsd should collect to at boot time.
# They need to be read/writeable, either by user gpsd or the group dialout.
# Other options you want to pass to gpsd
Then start gpsd
sudo systemctl start gpsd sudo systemctl enable gpsd # So that it will start and restart automatically
If your GPS has acquired satellites sufficient for a fix, you can see what it is reporting by running the client program
Use the 'q' key to stop cgps.
Once gpsd is running you can also use it update your system clock by editing /etc/ntp.conf and adding these lines
# Server from shared memory provided by gpsd server 127.127.28.0 minpoll 4 maxpoll 4 fudge 127.127.28.0 time1 +0.350 refid SHM stratum 15
sudo systemctl restart ntp
ntpq -prcv #to see that it is listed as SHM
This is useful when you don't have a network time server available such as when running a mobile tracker.
Running Two Radios on the UDRC™ II
NW Digital Radio is in the process of setting up various community groups at Groups.io Please create a personal account at Groups.io Join the main NW Digital group by sending an email from your registered email account to firstname.lastname@example.org and then send an email to email@example.com Please use the group for questions and to share your experiences, so that all UDRC™ users can benefit from the replies.