Ham Radio Applications of Linux Single Board · PDF fileHam Radio Applications of Linux...
Transcript of Ham Radio Applications of Linux Single Board · PDF fileHam Radio Applications of Linux...
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Ham Radio Applications ofLinux Single Board Computers
Willem A. Schreüder [email protected]
HamCon Colorado 2016
This talk is available online at
http://www.prinmath.com/ham/talks/
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Single Board Computers
● Full Linux boxes (today's topic)– Raspberry Pi
– Beaglebone
● Microcontrollers (not covered)– Arduino
– PICAXE
– BASIC Stamp
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Linux SBCs
● Runs a full Linux OS● Usable stand alone computer or server● Built in connectivity
– Ethernet networking
– USB and serial
– General purpose IO
● Expandable using daughter boards● Inexpensive ($50 for a working system)
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Potential Applications
● This talk:– AllStarLink repeater
– ADSB receiver
– Software Defined Receiver (SDR)
● Other talks– BPQ BBS, RMS and iGate
– Site monitoring
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Pros and Cons
● Pros– Inexpensive
– No moving parts
– 5V power
– Expandable
● Cons– SD cards corrupted by bad power
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AllStarLink Repeater
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ADSB SDR Receiver
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Raspberry Pi
● Most Popular● Best supported● rPi2 most powerful● Lots of USB ports● Lots of daughterboards● No analog inputs● $35 plus SD card
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BeagleBone
● Less well supported● Onboard eMMC● Power & Reset buttons● More GPIO pins● 8 analog inputs● $50 street price
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Power and Storage
● Runs on 5V DC– Needs clean power
● Micro SD card storage– Finite life
– Bad power kills SD
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What is AllStarLink?
● Asterisk VOIP software for radio● Interfaces with radio via URIx
– CM119 USB audio chip
– DB25 connector
● Can roll your own withequivalent fob
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Installing AllStarLink
● Download from www.hamviop.com– Burn image to SD card
● Program your radio/repeater– Set radio to encode/decode CTCSS
– On Motorola set accessories to output COS & PL on pin 8
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Initial Login
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Set Time Zone 1
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Set Time Zone 2
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Network Configuration
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Set Hostname
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Configure ssh
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Node Setup 1
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Node Setup 2
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Node Setup 3
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Node Callsign
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Stats
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CW or Voice ID
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Network Port
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Duplex
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Node Password
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IAX Password
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Simple USB Configuration 1
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Simple USB Configuration 2
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Select Radio
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EEPROM on URI
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URI Type
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Audio Boost
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Carrier Detect (COR or COS)
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CTCSS Decode
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Transmit Left Channel
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Transmit Right Channel
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PTT
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Filter CTCSS
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Flat or Speaker Audio
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Flat or Mic Audio
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Audio Delay
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Set Audio Levels
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Receive Audio Levels
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Transmit Left Audio Levels
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Transmit Right Audio Levels
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Done
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Make it Transmit
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Set Levels
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Set Receive Levels
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/etc/asterisk/simpleusb.conf
[usb]eeprom=0hdwtype=0rxboost=1carrierfrom=usbctcssfrom=usbtxmixa=voicetxmixb=noinvertptt=0duplex=0plfilter=yesdeemphasis=nopreemphasis=yesrxaudiodelay=0
● Configuration for Motorola SM50
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Update /srv/httpd/index.html
<html><head><title>40552</title></head><body><b>Node 40552</b><br><a href=allmon2/link.php?nodes=40552>AllMon</a><br><a href=cgi-bin/lsnodes_web?node=40552>lsnodes</a></body></html>
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Edit AllMon Files
● Edit /srv/httpd/allmon2/allmon.ini.php– Change XXXXX to node number
– Change passwd
● Edit /etc/asterisk/manager.conf– Add the same password to secret =
● Restart allstar– astres.sh
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Base Access
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AllMon2
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lsnode
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Observations
● By default the node list is updated daily via a cron job
● The rPi uses simpleusb due to limited CPU performance
● AllStar uses ArchLinux● There is no need to expand the OS
to fill the SD card (image size 4GB)
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ADSB SDR Receiver
● Receiver based on RTL2832 USB● About $20 on Amazon● Also used in
many ham relatedSDR projects
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Software Build
Build and install rtl-sdr modulegit clone git://git.osmocom.org/rtl-sdr.gitcd rtl-sdrmkdir buildcd buildcmake ../ -DINSTALL_UDEV_RULES=ONmakecd ..
Build and install dump1090git clonegit://github.com/MalcolmRobb/dump1090.gitcd dump1090makecd ..
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Command line interface
● ./view1019
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Running web interface
● ./dump1090 --net --lon -105 --lat 39
--net enables web interface port 8080
--lon and –lat sets location
● Run at boot from rc.local
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Building a high gain antenna
● Colinear made from coax
● Mount on N femaleinside PVC pipe
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Installation
● Mount the receiver as close to the antenna as possible– RTL-SDR is not weather proof
– 18” N to micro-UHF jumper
● Run long USB cable to rPi
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Running
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Other Projects
● The rPi 3 is a 1.2GHz 64 bit quad core machine with 1GB memory– Processing power to do cool stuff
● GNU radio● Adafruit
Freq Show
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SmokePi (SmokePing rPi)
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SmokePi = Bad Idea
● SD storage not suitable for database applications– Lots of writes wears out flash
● SmokePi generates lots of graphs– SD slow compared to disk
– Lots of writes wears out flash
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Questions?