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10	10	In real-world deployment for LoRa, distance is a common topic. We always want to have the longest distance. This chapter shows some instructions for how to improve this.
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13	13	= 2.  Analyze at the software side =
14	14
15	15	== 2.1  LoRa parameters that effect distance ==
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43	43	|(% 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
44	44	|(% style="width:134px" %)**AS923**|(% style="width:400px" %)14dBm|(% style="width:362px" %)SF=12|(% style="width:102px" %)125Khz
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46		-
47	47	== 2.2  Adaptive Data Rate (ADR) and set max distance ==
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65	65	This can be downlink via the LoRaWAN downlink command, see [[this link>>url:http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/#H8.2UseDownlinkCommandtosetafixuplinkDR]] for reference.
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	68	+
68	68	== 2.3  Check for short distance problem ==
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77	77	[[image:image-20221006185826-3.png]]
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	81	+
80	80	== 2.4  Best software settings for the longest distance ==
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86	86	* (% style="color:#037691" %)**AT+DR=  0**     (%%)~/~/  Use the smallest DR
87	87	* (% style="color:#037691" %)**AT+TXP=0**    (%%) ~/~/  Use max power.
88	88
89		-
90	90	= 3.  Analyze at the hardware side =
91	91
92	92	== 3.1  Check if the antenna path is good ~-~- For LSn50v2 series end node ==
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100	100	[[image:image-20221016081725-1.png||height="426" width="706"]]
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103	103	= 4.  Installation Guidelines =
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105	105	== 4.1  Check the use environment ==
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121	121	* High ISM band usage by other technologies.
122	122	* Radio communication are usually killed with bad topographic conditions. It is usually not possible to communicate through a hill, even very small.
123	123
124		-
125	125	== 4.2  Improve the Antenna ==
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128	128	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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131	131	= 5.  Some real-world case =
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133	133	== 5.1  Server reason cause end node has problem on Join. ==
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167	167	[[image:image-20221101000006-1.png||height="353" width="931"]]
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169	169
170		-= 6. Use a repeater =
171	171
172		-In some cases, user can consider use a repeater for limitation transmition.
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174		-See here for how to set up: [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20All%20Gateway%20models/LoRaWAN%20IoT%20Kit%20v3%20User%20Manual/#H7.Example6:LimitedLoRaWANrelay >>http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20All%20Gateway%20models/LoRaWAN%20IoT%20Kit%20v3%20User%20Manual/#H7.Example6:LimitedLoRaWANrelay]]
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