COPY, OVER

At a glance

COPY, OVER combines an educational signal-analysis playground with a directory of online radio receivers. It is worth exploring if you want to connect a changing sound frequency with its spectrum, or find a receiver to investigate separately. Keep the modes distinct: a generated test tone and a simulated space-signal display are not recordings of a live astronomical event.

Good fit

Curious beginners who learn by changing a parameter and seeing what follows. The built-in synthesizer makes the signal source explicit, so you can explore without supplying a recording or granting microphone access. The receiver directory is a separate way into WebSDR and KiwiSDR listening, with each receiver opening outside the site.

Consider something else when

You need a calibrated scientific measurement, confirmed live telescope data or validated radio-frequency classification. The educational interface and its NASA-related explanations do not establish those properties. Receiver availability and content also depend on the external operators rather than the directory alone.

Start here

Open Data Lab, choose Signal Analyzer and leave Synthesizer selected. Compare the displayed frequency and peak, then change the frequency slider. In the desktop trial, changing the setting from 440 to 880 Hz moved the reported peak from 438 to 875 Hz. This demonstrates the synthetic analysis loop; it does not establish measurement accuracy for a real recording.

Cost and requirements

The project describes itself as free with no ads or paywalls, and the synthesizer opened without signing in. Built-in signals avoid a microphone, receiver or uploaded audio file. Microphone, Line-In and Upload Audio are separate input options; their handling and retention were not established by the synthetic trial.

Limits to know

The homepage labels its featured signal as simulated. The Live Radio page links to external receivers; none was opened or assessed for listening quality. Use the synthetic mode to understand the controls first, then verify the source and requirements of any real signal you want to study. Claims about processing speed, calibration and astronomical interpretation remain unvalidated.

Still unclear

• How are microphone, line-in and uploaded recordings processed and retained?