Remote SDR

This is an idea page for the remote SDR setup. These are just ideas so far. Add yours!

Status:

• 3/4 SDR units have been received, the LimeSDR has been ordered
• one SDR (for ADSB) is operational but the antenna is not in an ideal location
• Plans are being made to construct one or two additional antennas and mount at least one with the ADSB antenna
• software survey in progress

See also subprojects:

• SDR distributed direction finding

intro

• software defined radio
• rtl-sdr.com
• Steve's SDR link collection

set up

• Multiple SDRs will be available (at least 4 have been ordered so far)
• Each SDR will have special features including
  • ADSB dedicated receiver
  • high resolution transceiver in shack on a random antenna
  • two cheap dongles on dedicated antennas (not built yet)
  • Each receiver's antenna will have a different range
• Some (all?) SDRs should be remotely accessible to club members
  • log in remote and control it
  • remotely switch SDR software for local display
  • run monitors (see below) when idle
• A stand alone display in a remote visible location could rotate through well labeled static and live displays
  • informational slides
  • live PSK display of an active band
  • live ADSB display
  • live FM broadcast display
  • prerecorded versions of live display data if receivers are down
  • user interaction with display?
• temperature sensor?

Software

Ideas for software:

• slide server (already implemented, client software could be tweaked)
• server indexing active SDRs and what mode they can be put in or if they are already in use
• SDR remote control software
  • view only / non-interactive client
  • bidirectional client with full control and selectable software

Interactive Applications

These allow (remote) users to interact directly with the SDR in one of several modes:

• Webserver / browser based
  • ShinySDR
• raw I/Q or time domain based samples
  • rtl-tcp
• processed frequency domain samples (lower bandwidth needed, higher local computational needs)
  • spyserver (from http://airspy.com )

See also:

• https://0xfeed.tech/2017/04/remote-access-tools-for-sdr-receivers/

Automatic applications

These can run (automatically? randomly?) when the SDR is not in use by interactive applications.

HF applications

• wspr (rx, tx[1][2]) [3]
• sstv (rx)
• meteor scatter detection
• 40m FT8/JT65/JT9 Monitor
• Beacon monotoring [4] [5]

uhf/vhf applications

• aprs
  • igate (rx, tx)
  • remote control? (rx)
  • telemetry: weather station? (tx)
  • TNC-X
• NWS WX (rx)
  • SAME (wikipedia)
  • repeater bridge?
• automatic satellite reception (rx)
  • using yagis / rotors
  • using moxon / rotor??
  • build a rotor
• weather pic (rx)
  • NOAA sats [6] [7]
  • GOES
  • wxtoimg APT and WEFAX
  • Meteor M2 (russian)
  • HRPT (needs dish)
• collect data for TXID fingerprinting
  • CTCSS fingerprinting
  • fingerprint via power curve attack/decay
  • voice fingerprinting
• direction finding via internet synchronized multiple receivers
  • range circles / signal strength
  • DF by time difference of arrival [8]
  • other DF methods [9]]
• FM to text using google speech recognition libraries
• lightning detection