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Recording of the Vela pulsar (PSR B0833-45) made at the Green Bank 140-ft telescope of the U.S. National Radio Astronomy Observatory, Charlottesville VA, in September, 1970. The observing frequency was 1664 MHz with an IF bandwidth of 4 MHz. The Vela pulsar has a pulse period of 89 ms and the audio is the detected signal with a time constant of about 1 ms.
Credit: R. N. Manchester

Recording of the first-discovered pulsar CP1919 (PSR B1919+21) made at the Parkes radio telescope in April 2012. The observing frequency was 732 MHz and bandwidth 64 MHz. The audio is the detected and dedispersed signal modulating white noise.
Credit: R. N. Manchester, G. Hobbs and J. Khoo, CSIRO Astronomy and Space Science