poor mystic
- Apr 8, 2011
- 1,074
- Joined
- Apr 8, 2011
- Messages
- 1,074
Maybe the op wants ultrasonic intranet, which would be great if it would work.
Those 40kHz ultrasonic transducers have very limited bandwidth, unfortunately - the 3dB points are usually at about 38 and 42kHz, I think. The passband is hardly flat, also, which doesn't help anyone.
I guess you might try hooking up a 9600 Bd modem - you could get away with it in your dreams - but in reality the poor, un-flat response in the transducers might mean you have to go to frequency modulation, if not Morse.
The new graphene speakers are said to have a flat response over 500kHz, and might be useful for such work.
I just noticed this: https://www.electronicspoint.com/threads/ultrasonic-serial-communication-transmitter.6470/
Those 40kHz ultrasonic transducers have very limited bandwidth, unfortunately - the 3dB points are usually at about 38 and 42kHz, I think. The passband is hardly flat, also, which doesn't help anyone.
I guess you might try hooking up a 9600 Bd modem - you could get away with it in your dreams - but in reality the poor, un-flat response in the transducers might mean you have to go to frequency modulation, if not Morse.
The new graphene speakers are said to have a flat response over 500kHz, and might be useful for such work.
I just noticed this: https://www.electronicspoint.com/threads/ultrasonic-serial-communication-transmitter.6470/
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