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Teresa wrote:...but the lower you go in hertz, the less information the signal can carry. This is why so-called voice cave radios are towards the higher frequencies- voice modulation requires more information carrying capacity than a simple on/off binary of Morse.
That being said: (and I come from a family of amateur operators, (Dad was ex-Signal Corps) who often entertained themselves tapping code on the kitchen table)...
There are also experiments going on with computerized signal compression and modulation which give the speaking voice a smaller footprint (like an mp3) without becoming incomprehensible. Smaller signal, lower in the frequency range (and farther through the rock) you can go.
Since no one else has mentioned it, how about the NSS Electronics Section?
NZcaver wrote:Teresa wrote:...but the lower you go in hertz, the less information the signal can carry. This is why so-called voice cave radios are towards the higher frequencies- voice modulation requires more information carrying capacity than a simple on/off binary of Morse.
Teresa wrote:I know that.
One of the radios I am aware of is below 10kHz-- at that freq you start running into the information problem.
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