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Quindar Tones and Apollo


WMcD

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 This was on NPR a couple of weeks ago.  They were reporting on how a modern band adopted the name.

 

Of more interest to me was the origin.

 

https://en.wikipedia.org/wiki/Quindar_tones

 

I was not aware of the technology behind the beeps and back in the day had not distinguished the different pitch.  However in the recording provided, they are distinguishable.

 

I did some math.  The difference in freq is a bit more than a half note.  The freqs don't correspond to standard musical notes though.

 

WMcD 

 

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