An Apollo Program Radio Beep isolated from public domain NASA recordings. They were called Quindar beeps, and were used to signal ground station transmitters to turn on.
It does have static distorting it slightly, as it is intended to be slotted over existing radio backdrop noise.
If you don’t like that, search Quindar Tone on freesound and check out some manually generated versions from other users.
Type
Wave (.wav)
Duration
0:00.307
File size
121.4 KB
Sample rate
48000.0 Hz
Bit depth
32 bit
Channels
Stereo
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