Historical radio experiments

These files record earlier experiments. Start with the current classroom software or research examples when choosing an application.

The collection contains 53 distinct files from 55 historical paths. Three copies of the same LimeSDR graph share one entry. Each original is downloadable from this website and remains unchanged, including saved notebook outputs and earlier hardware settings.

Download all historical experiments (ZIP, 18.1 MB). The package includes source commits, checksums, and attribution notices.

Historical software may require older GNU Radio blocks, local paths, or data that are not included. The observed-pulsar recording and 40-foot telescope recording were not found in the preserved repositories. If you have a copy, attach it or share a download link in the corresponding issue. The catalog preserves their source and saved results; it does not establish that the experiments can be rerun.

The three earlier simulation datasets are different from the current reference samples. Both versions remain available. The small input file for the older dedispersion test is included; its expected original filename appears in the package manifest.

Receivers, interferometry, and recording

Current classroom software

• LimeSDR multiplying interferometer, 2021 (GRC, 2021-08-03)
  An earlier version of the multiplying interferometer. The current graph retains the 30 signal connections and updates controls, receiver settings, and output paths.
  Download LimeSDR multiplying interferometer, 2021 · View original source
• Spectrometer testing, 2020 (GRC, 2020-07-09)
  Earlier receiver, calibration, CSV, and HDF5 experiment.
  Download Spectrometer testing, 2020 · View original source
• Calibrated spectrometer variant, 2020 (GRC, 2020-07-09)
  A distinct saved calibration variant; retained separately from the testing graph.
  Download Calibrated spectrometer variant, 2020 · View original source
• Calibrated chart recorder (GRC, 2019-07-22)
  Earlier calibrated spectrometer with time displays and a chart-recorder block.
  Download Calibrated chart recorder · View original source
• Correlation block test (GRC, 2018-06-20)
  A correlation-block test with delayed input and phase/magnitude displays.
  Download Correlation block test · View original source
• HDF5 spectrometer recorder (GRC, 2018-06-08)
  Recording experiment using a retired spectrometer hierarchy and four HDF5 sinks.
  Download HDF5 spectrometer recorder · View original source
• HDF5 integer recorder (GRC, 2018-06-08)
  Recorder variant with an explicit float-to-integer conversion.
  Download HDF5 integer recorder · View original source
• HDF5 mixed-type recorder (GRC, 2018-06-08)
  Recorder variant with real and integer conversions.
  Download HDF5 mixed-type recorder · View original source
• HDF5 floating-point recorder (GRC, 2018-06-08)
  Recorder variant with complex-to-float conversion and five HDF5 sinks.
  Download HDF5 floating-point recorder · View original source
• HDF5 multi-output floating-point recorder (GRC, 2018-06-08)
  Recorder variant with two complex-to-float conversions and six HDF5 sinks.
  Download HDF5 multi-output floating-point recorder · View original source
• HDF5 floating-point and integer recorder (GRC, 2018-06-08)
  Recorder variant combining floating-point, real, and integer conversions.
  Download HDF5 floating-point and integer recorder · View original source
• Integration block test (GRC, 2018-05-04)
  Synthetic noise and tone input for the older integration and ASCII-sink blocks.
  Download Integration block test · View original source

NSF configurations and diagnostic figures

Current NSF application catalog

• NSF mapping experiment, 6 MHz (GRC, 2024-01-05)
  An earlier mapping and integration variant; kept as an experiment alongside the current NSF catalog.
  Download NSF mapping experiment, 6 MHz · View original source
• Three consecutive test events (PNG, 2020-03-23)
  Original comparison of three recorded test events.
  Download Three consecutive test events · View original source
• Three test events, enlarged view (PNG, 2020-03-23)
  Closer view of the same three event traces.
  Download Three test events, enlarged view · View original source
• Single-event plotting trial (PNG, 2020-03-23)
  The original image contains axes and a legend but no visible event trace; retained as a plotting trial.
  Download Single-event plotting trial · View original source
• Odroid pulse-test screen (PNG, 2020-03-23)
  Original application and terminal screenshot from an Odroid pulse test.
  Download Odroid pulse-test screen · View original source
• NSF PlutoSDR diagnostic test (GRC, 2020-03-19)
  Earlier hardware-specific observing configuration. Use the current NSF catalog when choosing an application; preserve this version for its original receiver and settings.
  Download NSF PlutoSDR diagnostic test · View original source
• NSF Integrate 64, PlutoSDR (GRC, 2020-03-19)
  Earlier hardware-specific observing configuration. Use the current NSF catalog when choosing an application; preserve this version for its original receiver and settings.
  Download NSF Integrate 64, PlutoSDR · View original source
• NSF Integrate 90, SDRplay (GRC, 2020-02-15)
  Historical source graph for the 9 MHz SDRplay variant. The current catalog also retains a saved Python program; matching behavior is not assumed.
  Download NSF Integrate 90, SDRplay · View original source
• NSF Integrate 59, SDRplay (GRC, 2020-01-13)
  Earlier hardware-specific observing configuration. Use the current NSF catalog when choosing an application; preserve this version for its original receiver and settings.
  Download NSF Integrate 59, SDRplay · View original source
• NSF Watch 70, SDRplay (GRC, 2019-12-20)
  Earlier hardware-specific observing configuration. Use the current NSF catalog when choosing an application; preserve this version for its original receiver and settings.
  Download NSF Watch 70, SDRplay · View original source
• NSF Watch 64, PlutoSDR (GRC, 2019-11-26)
  Earlier hardware-specific observing configuration. Use the current NSF catalog when choosing an application; preserve this version for its original receiver and settings.
  Download NSF Watch 64, PlutoSDR · View original source
• NSF Integrate 70, SDRplay (GRC, 2019-11-14)
  Earlier hardware-specific observing configuration. Use the current NSF catalog when choosing an application; preserve this version for its original receiver and settings.
  Download NSF Integrate 70, SDRplay · View original source
• NSF Integrate 32, PlutoSDR (GRC, 2019-11-12)
  Earlier hardware-specific observing configuration. Use the current NSF catalog when choosing an application; preserve this version for its original receiver and settings.
  Download NSF Integrate 32, PlutoSDR · View original source
• NSF Watch 32, PlutoSDR (GRC, 2019-11-11)
  Earlier hardware-specific observing configuration. Use the current NSF catalog when choosing an application; preserve this version for its original receiver and settings.
  Download NSF Watch 32, PlutoSDR · View original source
• NSF Integrate 60, no-fit variant (GRC, 2019-06-29)
  Earlier hardware-specific observing configuration. Use the current NSF catalog when choosing an application; preserve this version for its original receiver and settings.
  Download NSF Integrate 60, no-fit variant · View original source
• NSF Integrate 30, RTL-SDR variant (GRC, 2019-04-08)
  Earlier hardware-specific observing configuration. Use the current NSF catalog when choosing an application; preserve this version for its original receiver and settings.
  Download NSF Integrate 30, RTL-SDR variant · View original source
• NSF Integrate 20 (GRC, 2018-07-18)
  Earlier hardware-specific observing configuration. Use the current NSF catalog when choosing an application; preserve this version for its original receiver and settings.
  Download NSF Integrate 20 · View original source
• Velocity profiles from an elevation scan (PNG, 2018-05-04)
  Original intensity-versus-velocity comparison across telescope elevations.
  Download Velocity profiles from an elevation scan · View original source
• Raw horn spectra after a cable upgrade (PNG, 2018-05-04)
  Original uncalibrated horn spectra labeled Green Bank and cable upgrade.
  Download Raw horn spectra after a cable upgrade · View original source
• Calibrated horn spectra by elevation (PNG, 2018-05-04)
  Original calibrated intensity-versus-frequency comparison across elevations.
  Download Calibrated horn spectra by elevation · View original source

Audio demonstrations

Current signal-generation lessons

• Left and right audio tones (GRC, 2021-04-13)
  GNU Radio 3.7 example with separate left and right tone controls and an audio input.
  Download Left and right audio tones · View original source
• Single audio tone (GRC, 2021-04-13)
  GNU Radio 3.7 example with one tone source, volume control, and an audio input.
  Download Single audio tone · View original source

Pulsar and transient experiments

Current research examples

• Observed pulsar detection pipeline (IPYNB, 2019-09-30)
  Processes an observed pulsar recording and explores dedispersion, folding, and signal-to-noise estimates. Its local SDF recording is not included.
  Download Observed pulsar detection pipeline · View original source
  Help recover the missing recording for Observed pulsar detection pipeline
• Pulse simulation and detection pipeline (IPYNB, 2019-09-30)
  Earlier simulation with analog mixing, channelization, dispersion trials, and detection. It shares concepts and functions with the current notebooks but remains a distinct version.
  Download Pulse simulation and detection pipeline · View original source
• 40-foot telescope pulsar experiment (IPYNB, 2019-08-19)
  Exploratory HDF5 analysis, folding, and dedispersion for the 40-foot telescope. The local testfile HDF5 recordings are not included.
  Download 40-foot telescope pulsar experiment · View original source
  Help recover the missing recording for 40-foot telescope pulsar experiment
• Pulse-in-beam spectrum (PNG, 2019-08-07)
  Saved frequency-domain plot labeled Pulse in Beam.
  Download Pulse-in-beam spectrum · View original source
• Folded pulse profile (PNG, 2019-08-07)
  Saved amplitude profile against time bins.
  Download Folded pulse profile · View original source
• Pulse-out-of-beam spectrum (PNG, 2019-08-07)
  Saved frequency-domain plot labeled Pulse out of Beam.
  Download Pulse-out-of-beam spectrum · View original source
• Original pulse-data image (PNG, 2019-08-07)
  Saved image of the original pulse-data array.
  Download Original pulse-data image · View original source
• LimeSDR recording program screen (PNG, 2019-08-07)
  Screenshot of the LimeSDR and HDF5 recording program.
  Download LimeSDR recording program screen · View original source
• Event detection with a recording sink (GRC, 2019-03-26)
  A detection demonstration that adds event logging and file recording.
  Download Event detection with a recording sink · View original source
• Event detection with a log (GRC, 2019-03-03)
  A detection demonstration with event logging.
  Download Event detection with a log · View original source
• Basic event detection example (GRC, 2019-03-01)
  The basic noise-driven detection demonstration.
  Download Basic event detection example · View original source
• File-based dedispersion test (GRC, 2019-01-25)
  Dedispersion from a local sample file, with an HDF5 sink.
  Download File-based dedispersion test · View original source
• Noise-based dedispersion example (GRC, 2019-01-24)
  A noise-driven dedispersion demonstration.
  Download Noise-based dedispersion example · View original source
• Original dispersed-pulse figure (PNG, 2019-07-09)
  The filename says DM=20, while the saved plot title says DM=00. Both labels are retained without choosing one as correct.
  Download Original dispersed-pulse figure · View original source
• Early pulsar simulation and peak-search notebook (IPYNB, 2019-06-13)
  Earlier peak-search and dedispersion development, including saved outputs. The current search-development notebook contains related functions and later changes.
  Download Early pulsar simulation and peak-search notebook · View original source
• Earlier pulse simulation samples (BIN, 2019-07-26)
  An earlier headerless simulation file with different bytes from the current reference dataset. Original filename parameters are historical labels, not independently verified metadata.
  Download Earlier pulse simulation samples · View original source
• Earlier integrated pulse spectra (BIN, 2019-07-26)
  An earlier headerless simulation file with different bytes from the current reference dataset. Original filename parameters are historical labels, not independently verified metadata.
  Download Earlier integrated pulse spectra · View original source
• Earlier noise simulation samples (BIN, 2019-07-26)
  An earlier headerless simulation file with different bytes from the current reference dataset. Original filename parameters are historical labels, not independently verified metadata.
  Download Earlier noise simulation samples · View original source
• Original dedispersion test input (DAT, 2019-01-25)
  The original input named by the file-based dedispersion test. The manifest records the filename expected by that graph; this preserved input does not validate the experiment.
  Download Original dedispersion test input · View original source

More historical material