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1		-~*~*Table of Contents：~*~*
	1	+**Table of Contents:**
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3		-~{~{toc/}}
	3	+{{toc/}}
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	75	+= Installation Guidelines =
75	75
	77	+== Check the use environment ==
76	76
	79	+First , User should notice: Radio link quality and performances are highly dependent of the environment.
	80	+
	81	+Better performances can be reached with:
	82	+
	83	+* Outdoor environment.
	84	+* No obstacles.
	85	+* No high level radio interferes in the ISM band you use.
	86	+* At least 1 meter above the ground.
	87	+
	88	+
	89	+Radio performances are degraded with:
	90	+
	91	+* Obstacles: buildings, trees...
	92	+* Inner buildings environments.
	93	+* High ISM band usage by other technologies.
	94	+* Radio communication are usually killed with bad topographic conditions. It is usually not possible to communicate through a hill, even very small.
	95	+
	96	+
	97	+== Improve the Antenna ==
	98	+
	99	+In some case, we have to install the device inside the chamber or next to a metal case. So the signal between the antenna and the receiver (gateway) is blocked by the metal. This will greatly reduce the signal. In such case, we can consider using antenna extend cable to extend the antenna to a better position.
	100	+
	101	+
77	77	= Some real-world case =
78	78
79	79	== Server reason cause end node has problem on Join. ==