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Fixed caps in title, added more descriptive link and fixed various typos
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How to reduce the range of WIRELESS RF SERIAL LINK 433MHZ +20DBM 2KM RANGEsensors to 1.5m?

I have bought 4four RF sensors from Robokits - Wireless RF serial link 433 MHz +20 dBm 2 Km range. 

I want to locate one of them with the help other three sensors by the means of triangulation. My project requires this localisation under distance of 2 meters. So, how tocan I reduce the range of these sensors to 2m 2 m? 

I'm using arduinoArduino, Raspberry piPi as processors for the project. Any Documentationdocumentation/reference links would also be welcome. I have worked on zigbeesZigBees before, but this is the first time with RF.

How to reduce the range of WIRELESS RF SERIAL LINK 433MHZ +20DBM 2KM RANGE to 1.5m?

I have bought 4 RF sensors from Robokits. I want to locate one of them with the help other three sensors by the means of triangulation. My project requires this localisation under distance of 2 meters. So, how to reduce the range of these sensors to 2m ? I'm using arduino, Raspberry pi as processors for the project. Any Documentation/reference links would also be welcome. I have worked on zigbees before, this is the first time with RF.

How to reduce the range of RF sensors to 1.5m?

I have bought four RF sensors from Robokits - Wireless RF serial link 433 MHz +20 dBm 2 Km range. 

I want to locate one of them with the help other three sensors by the means of triangulation. My project requires this localisation under distance of 2 meters. So, how can I reduce the range of these sensors to 2 m? 

I'm using Arduino, Raspberry Pi as processors for the project. Any documentation/reference links would also be welcome. I have worked on ZigBees before but this is the first time with RF.

Post Closed as "Duplicate" by Marcus Müller, Bimpelrekkie, Dave Tweed
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How to reduce the range of WIRELESS RF SERIAL LINK 433MHZ +20DBM 2KM RANGE to 1.5m?

I have bought 4 RF sensors from Robokits. I want to locate one of them with the help other three sensors by the means of triangulation. My project requires this localisation under distance of 2 meters. So, how to reduce the range of these sensors to 2m ? I'm using arduino, Raspberry pi as processors for the project. Any Documentation/reference links would also be welcome. I have worked on zigbees before, this is the first time with RF.