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WebSDR withRaspberry Pi
Tommy Gober, N5DUXFont: Franklin Gothic Demi
Poll the Audience
How many have a Raspberry Pi?
How many use Linux? In shack?
How many have assembled Softrock?
Receiver
Softrock Lite II
Center frequency of 7.159
RTL-SDR may be now be possible!
Software Defined Radio
Direct Conversion Receiver
I/Q signals 90° out of phase waveform diff provides signal demod via geometry
Raspberry Pi
$35± Different Models Model B Also need:
5VDC power, SD,keyboard, video*wifi? case?
Soundcard
WebSDR requires stereo input
Cheap USB devices won’t do Wolfson Audio Card ($35) from Element14
stereo in, 192kHz ADC
Drivers
Element14 makes drivers available
Cross compile Raspbian Distro from Element14
Linux Config
startup scriptscreenWebSDR configHostnameEnable IPV6Ensure ALSA works
Linux Config
screen Hostname (websdr40) Enable IPV6 Ensure ALSA works WebSDR config
Router Config
DynDNS Router port forwarding Considerations:
Security QoS Max users ISP ToS
WebSDR withRaspberry PiTommy Gober, N5DUX