Signal transfer up to 5Km

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Joc1978

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I need to transfer digital signal up to 5Km away as quick as possible. Can anyone suggest me best communication solution?
Digital input on side 1 must set my digital output on side 2.


Any idea is welcome,

Regards,

Joze
 

First thanks for your fast answer TPetar.
I have 5 volt digital input on my arduino microcontroller, which must be transfered to other location.
 

Yes, I examine this product before.
The only negative thing here is a price. I need this two modems for skiing stopwatch.
Digital input on my arduino on one side will start stopwatch at the end.
 

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