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You can explore Radio JOVE’s public radio-astronomy observations without buying a receiver or building an antenna: use its live streams and participant archive, then move to an SDR setup if you want to collect observations of your own. The documented Radio JOVE 2.1 system is designed for decametric signals around 20 MHz—not as a general-purpose setup for every radio astronomy band.
Explore shared observations before buying equipment
NASA Radio JOVE offers two ways to start with other observers’ data: connect to streaming observations in Radio-Sky Spectrograph (RSS) Client Mode, or browse the project’s web-accessible archive of participant-submitted data. The project page also links to a live spectrograph stream. These let you see how observations are displayed before assembling a radio telescope. See NASA Radio JOVE’s Getting Started page.
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- Open the Radio JOVE Getting Started page and follow its link to download Radio-Sky Spectrograph (RSS) for Windows.
- In RSS, use Client Mode to connect to an available observer stream, or open an observation from the project’s web archive.
- Read the plot’s axes: frequency and time. Color represents relative signal strength; it is not a photograph of the sky.
When comparing records, note the observer, timestamp and frequency coverage. A bright trace by itself does not establish a celestial source: Radio JOVE’s stated scope includes terrestrial signals as well as emissions from the Sun, Jupiter and the Galaxy.
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A software-defined radio (SDR) receives radio-frequency signals and passes data to software for processing or display. In Radio JOVE’s documented workflow, software applies processing that includes a Fast Fourier Transform to produce a spectrogram: signal intensity plotted over frequency and time. For example, the project manual shows solar bursts as enhanced yellow-red vertical features that can last seconds to minutes. Those features are recorded signal behavior to interpret, not a direct image of an object in the sky. Read the Radio JOVE 2.1 receiver manual for its display and signal-chain details.
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An SDR alone is not a radio telescope. It needs a suitable antenna, connecting hardware, a computer and compatible observing software. Radio JOVE describes its project observations in the 15–30 MHz range; its 2.1 setup is nominally 16–24 MHz, with a typical operating band 8 MHz wide and centered on 20 MHz. NASA identifies 18–22 MHz as a particularly useful range for Jupiter observations. These are project-specific, decametric observations, not a recipe for the 21 cm neutral hydrogen line near 1420 MHz, which requires a different receiver-and-antenna approach. See the Radio JOVE 2.1 overview and Getting Started.
What the documented Radio JOVE 2.1 setup includes
Receiver
The current named receiver in the Radio JOVE 2.1 overview is the SDRplay RSP1B. The overview lists its receiver range as 1 kHz to 2 GHz, with up to 10 MHz of visible bandwidth, and describes the project setup as tuned around 20 MHz. Those broad receiver specifications do not mean any antenna or software combination works at every frequency. NASA says other receivers may work, but does not guarantee compatibility. The RSP1A was replaced by the RSP1B in 2025, so older instructions may describe a different setup. Check the Radio JOVE radio telescope page and current project documentation before choosing hardware.
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- The best-performing low-cost RTL-SDR available anywhere! Compared with RTL-SDR v3, HF SNR is improved by up to 15dB, VHF & UHF SNR is improved by up to 6dB, tuning accuracy is improved by an average of 4x, and the frequency range is expanded all the way down to 100kHz
- v5 has a frequency capability of 100kHz to 1.75GHz and up to 3.2MHz of instantaneous bandwidth. HF reception below 25MHz is accomplished with direct sampling and requires a suitable antenna. We recommend using a Balun One Nine to make a DIY long wire or dipole antenna (sold separately, product ID B08HGSYB7R or B00R09WHT6)
- Though the direct sampling implementation of NESDR SMArt v5 is much better than any other RTL-SDR, we still recommend using an upconverter like the Ham It Up for a more fulfilling HF experience (sold separately, product ID B076CYK8XZ)
Antenna and observing location
The receiver manual recommends a single or dual dipole for the project and says two dipoles are needed for weaker Jupiter and solar emissions. The overview describes a dual-dipole array and advises avoiding nearby power lines and buildings, which can contribute electrical noise. Antenna design, placement and safety affect what you can receive; follow the current Radio JOVE antenna instructions and take particular care around overhead power lines. See the 2.1 overview and receiver manual.
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Computer and software
The March 2025, version 1.0 manual describes this software chain: SDRuno controls the SDRplay receiver; SDR Console connects to and controls it; SDRc2RSS routes data; and Radio-Sky Spectrograph displays or records signal strength against frequency and time. The Radio JOVE-specific software described there supports Windows 7 or higher and does not support Mac or Linux. Software and compatibility can change, so check the project’s current software page before installing anything. RSP1A and RSP1B instructions are not interchangeable in every detail: the updated RSP1B chain uses SDR Console. See the manual and 2.1 overview.
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Move from public data to your own observations
- Learn the display first. View a stream or archived record and identify its time and frequency axes, color scale and frequency coverage.
- Compare observations carefully. Record the observer and timestamp, and look for whether a trace is a candidate burst or mostly background or interference. Do not attribute a bright feature to a celestial source based on brightness alone.
- Read the current equipment instructions. Review the Radio JOVE 2.1 receiver and antenna documentation before assembling anything; confirm receiver, operating-system and software compatibility.
- Build the full signal chain. Connect an appropriate antenna to a compatible SDR, then configure the documented control, routing and display software. The receiver is one component, not a standalone telescope.
- Record a test spectrum. Use the display to inspect signal strength across frequency and time, then compare what you see with shared observations and account for possible local interference.
- Share observations if you participate. Radio JOVE provides community and data-archive routes for participants to share observations; consult its current project instructions for submission details.
Choosing between public data and an SDR setup
| Approach | What you need | Best suited to |
|---|---|---|
| Radio JOVE stream or archive | A computer and access to the project’s stream or web archive; RSS Client Mode is a Windows route for streaming observations. | Learning to read spectrograms and exploring shared observations without building a telescope. |
| Radio JOVE 2.1 SDR system | A compatible SDR, suitable dipole antenna and connecting hardware, a computer, and the project’s software chain. The March 2025 manual documents Windows 7 or higher. | Collecting your own project observations around 20 MHz, subject to antenna, software and site conditions. |
When considering a different receiver, compare its usable frequency coverage and bandwidth for the target, compatibility with the project’s software, antenna and cabling needs, and susceptibility to local interference. Treat non-RSP1B receivers as alternatives to verify, not guaranteed plug-and-play replacements. NASA’s published estimate is $300–$500 total for a radio telescope kit and antenna parts; this is a page estimate, not a current retailer quote. See NASA Science’s Radio JOVE page.
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