Which communication is best for devices 500m apart?

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which communication is best between devices that is 500 meters apart and both should retransmit?
 

Hi,

What is the best car for me? My work is 40 km away.
Do you know what i mean?


Please define "best".
* price
* speed
* communication quality
* reliability
* safe not to be hacked
* and a lot of other parameters.

****
For one the "best" solution is a glass fiber cable with high speed
for the other just two GSM modems. Or modems on telefone lines.

using internet, radio, optical with laser, cable (copper) or not..
ultrasonic would be a challenge....

Klaus
 

i need to communicate over 500 meters with high-speed and low-cost communication..Is there any Zigbee module that can communicate over 500 meters ?
 

Hi,

Please learn to provide technical data.

Define "high speed". In bits/s.
Define how you want transmit the data. Zigbee is wireless radio. Is wireless radio the only possible?
Describe what's inbetween the two devices. Sea, free view, hill, road, bridge, houses, power line, trees...
Describe what and where the two devices are.

Please give more details, otherwise it is impossible to give (good) answer.

Klaus
 

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