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RC Frequency in Water

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Unless I'm mistaken that's a 1W 75Mhz transmitter - 30ft of water should be a piece of cake. I'd be amazed if 100ft even did anything. If you were using a 2.4Ghz radio though, you would get pretty much 100% absorption by the water so stay away from that band.

well, for submarines I know they use VLF or ULF, around 120hz I think. Unfortunately, with such a low frequency data transmission is quite slow -- you should be fine with the lowest frequency hobby transmitter you can find.


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