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44	44	|(% style="width:134px" %)**US915**|(% style="width:400px" %)20 or 22 dBm (depends on max output of module)|(% style="width:362px" %)SF=10|(% style="width:102px" %)125Khz
45	45	|(% style="width:134px" %)**AS923**|(% style="width:400px" %)14dBm|(% style="width:362px" %)SF=12|(% style="width:102px" %)125Khz
46	46
	47	+
	48	+
47	47	== 2.2  Adaptive Data Rate (ADR) and set max distance ==
48	48
49	49
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88	88	* (% style="color:#037691" %)**AT+DR=  0**     (%%)~/~/  Use the smallest DR
89	89	* (% style="color:#037691" %)**AT+TXP=0**    (%%) ~/~/  Use max power.
90	90
91		-= 3.  Analyze at the hardware side =
92	92
93		-== 3.1  Check if the antenna path is good ~-~- For LSn50v2 series end node ==
94	94
	95	+= 3.  Installation Guidelines =
95	95
96		-a) Open Enclosure and Check if the antenna connection to module is good.
	97	+== 3.1  Check the use environment ==
97	97
98		-b) check if the connector match.
99	99
	100	+First , User should notice: Radio link quality and performances are highly dependent of the environment.
100	100
101		-[[image:image-20221016081725-1.png||height="426" width="706"]]
102		-
103		-
104		-
105		-= 4.  Installation Guidelines =
106		-
107		-== 4.1  Check the use environment ==
108		-
109		-
110		-First , User should notice: Radio link quality and performances are highly dependent of the environment.Even you have the same hardware and antenna, Different installation will result in different performance.
111		-
112	112	(% style="color:blue" %)**Better performances can be reached with:**
113	113
114	114	* Outdoor environment.
...	...	@@ -116,6 +116,8 @@
116	116	* No high level radio interferes in the ISM band you use.
117	117	* At least 1 meter above the ground.
118	118
	109	+
	110	+
119	119	(% style="color:blue" %)**Radio performances are degraded with:**
120	120
121	121	* Obstacles: buildings, trees...
...	...	@@ -123,16 +123,18 @@
123	123	* High ISM band usage by other technologies.
124	124	* Radio communication are usually killed with bad topographic conditions. It is usually not possible to communicate through a hill, even very small.
125	125
126		-== 4.2  Improve the Antenna ==
127	127
128	128
	120	+== 3.2  Improve the Antenna ==
	121	+
	122	+
129	129	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.
130	130
131	131
132	132
133		-= 5.  Some real-world case =
	127	+= 4.  Some real-world case =
134	134
135		-== 5.1  Server reason cause end node has problem on Join. ==
	129	+== 4.1  Server reason cause end node has problem on Join. ==
136	136
137	137
138	138	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.
...	...	@@ -148,27 +148,4 @@
148	148
149	149	Reference Link:  [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/Change%20Gateway%20Power/#H1.A0Overview>>http://wiki.dragino.com/xwiki/bin/view/Main/Change%20Gateway%20Power/#H1.A0Overview]]
150	150
151		-
152		-== 5.2 Chirpstack Default settings to 64 channels which cause Signal Poor. ==
153		-
154		-
155		-In this case, User use a Chirpstack LoRaWAN server with default settings. The Frequency Band is US915 and default settings of Chirpstack has all channels ( All sub-bands , total 72 channels) enable. User use a LDS03A and a LPS8N LoRaWAN gateway for the test.
156		-
157		-
158		-There is a strange issue: LDS03 has a very good RSSI ( RSSI=-40) during OTAA Join. But The LDS03A give a very poor RSSI after OTAA Join. After debug, it proves that the issue is with ChirpStack Frequency band settings. The ChirpStack server enables all 72 channels and the LDS03A will also use all channels after OTAA Join, but the LPS8N only can support 8 channels and set to Sub-Band2. When the LDS03A sends an uplink packet in the channel LPS8N doesn't support, because LDS03A is very close to LPS8N, LPS8N pick up this not support frequency and send to server. So in the platform we see a uplink packet with very poor RSSI.
159		-
160		-
161		-Above issue was confirmed and solved after set the ChirpStack support channels to sub-band2. See below for photos during debug.
162		-
163		-[[image:image-20221031233628-2.png]]
164		-
165		-
166		-[[image:image-20221031233759-3.png]]
167		-
168		-
169		-[[image:image-20221101000006-1.png||height="353" width="931"]]
170		-
171		-
172		-
173		-
174	174

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