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...	...	@@ -45,6 +45,7 @@
45	45	|(% style="width:134px" %)**AS923**|(% style="width:400px" %)14dBm|(% style="width:362px" %)SF=12|(% style="width:102px" %)125Khz
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47	47
	48	+
48	48	== 2.2  Adaptive Data Rate (ADR) and set max distance ==
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50	50
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90	90	* (% style="color:#037691" %)**AT+TXP=0**    (%%) ~/~/  Use max power.
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92	92
93		-= 3.  Analyze at the hardware side =
94	94
95		-== 3.1  Check if the antenna path is good ~-~- For LSn50v2 series end node ==
	95	+= 3.  Installation Guidelines =
96	96
97		-a) Open Enclosure and Check if the antenna connection to module is good.
	97	+== 3.1  Check the use environment ==
98	98
99		-b) check if the connector match.
100	100
101		-[[image:image-20221016081725-1.png||height="426" width="706"]]
102		-
103		-
104		-= 4.  Installation Guidelines =
105		-
106		-== 4.1  Check the use environment ==
107		-
108		-
109	109	First , User should notice: Radio link quality and performances are highly dependent of the environment.
110	110
111	111	(% style="color:blue" %)**Better performances can be reached with:**
...	...	@@ -116,6 +116,7 @@
116	116	* At least 1 meter above the ground.
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	110	+
119	119	(% style="color:blue" %)**Radio performances are degraded with:**
120	120
121	121	* Obstacles: buildings, trees...
...	...	@@ -124,16 +124,17 @@
124	124	* Radio communication are usually killed with bad topographic conditions. It is usually not possible to communicate through a hill, even very small.
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126	126
127		-== 4.2  Improve the Antenna ==
128	128
	120	+== 3.2  Improve the Antenna ==
129	129
	122	+
130	130	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.
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134		-= 5.  Some real-world case =
	127	+= 4.  Some real-world case =
135	135
136		-== 5.1  Server reason cause end node has problem on Join. ==
	129	+== 4.1  Server reason cause end node has problem on Join. ==
137	137
138	138
139	139	In one case, the customer is using AWS IoT Core and gateway to connect to AWS via Basic Station Connection, Frequency Band is AU915 sub-band 2. For some unknown reason, AWS always set downlink power to 0dBm, which cause the gateway only emit a very low power and lead to a short distance for sensor.