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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
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47	47	== 2.2  Adaptive Data Rate (ADR) and set max distance ==
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89	89	* (% style="color:#037691" %)**AT+TXP=0**    (%%) ~/~/  Use max power.
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92	92	= 3.  Analyze at the hardware side =
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94	94	== 3.1  Check if the antenna path is good ~-~- For LSn50v2 series end node ==
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125	125	* 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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128	128	== 4.2  Improve the Antenna ==
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150	150
151	151	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]]
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153		-
154		-== 5.2 Chirpstack Default settings to 64 channels which cause Signal Poor. ==
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157		-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.
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160		-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.
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163		-Above issue was confirmed and solved after set the ChirpStack support channels to sub-band2. See below for photos during debug.
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165		-[[image:image-20221031233628-2.png]]
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168		-[[image:image-20221031233759-3.png]]
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171		-[[image:image-20221101000006-1.png||height="353" width="931"]]
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1		-XWiki.Edwin

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