5

Russian version of Sputnik-1 Wikipedia article has the section labeled "Sounds of Sputnik" and cites the respective technical report regarding development of the Sputnik's "radio device" D-200 (in Russian). According to the report, primary reason for transmitting on two frequencies was redundancy. The transmission frequency had to be higher than that of the ...


3

It appears to just be a carrier signal alternately transmitted and not transmitted. As the carrier is in the MHz range, the audio cannot be a direct mapping of that frequency. I don't know the specific mechanisms used to make the signal audible as a particular tone, or whether that tone would differ between different receivers. There are multiple ...


3

You can get some information from SpaceX's FCC filings for "Special Temporary Authority". There aren't always individual ones for specific launches, because certain approvals cover larger times, and they're a little broken up. For example, 0551-EX-ST-2019 covers transmissions from the first and second stages during flight, while the more-recent 2181-EX-ST-...


2

The following is (now apparently disproven) speculation based on some very basic radio theory rather than any particular knowledge of Sputnik 1. It should be disregarded if someone with knowledge of the actual circuits in use has better information. I did some web searching but did not find any descriptions of Sputnik 1 that provided good evidence for or ...


Only top voted, non community-wiki answers of a minimum length are eligible