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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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12	12
13		-
14	14	= 2.  Analyze at the software side =
15	15
16	16	== 2.1  LoRa parameters that effect distance ==
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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
	46	+
47	47	== 2.2  Adaptive Data Rate (ADR) and set max distance ==
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49	49
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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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67	67
68		-
69	69	== 2.3  Check for short distance problem ==
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71	71
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78	78	[[image:image-20221006185826-3.png]]
79	79
80	80
81		-
82	82	== 2.4  Best software settings for the longest distance ==
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84	84
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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
	89	+
91	91	= 3.  Analyze at the hardware side =
92	92
93	93	== 3.1  Check if the antenna path is good ~-~- For LSn50v2 series end node ==
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101	101	[[image:image-20221016081725-1.png||height="426" width="706"]]
102	102
103	103
104		-
105	105	= 4.  Installation Guidelines =
106	106
107	107	== 4.1  Check the use environment ==
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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.
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	124	+
126	126	== 4.2  Improve the Antenna ==
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128	128
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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.
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131	131
132		-
133	133	= 5.  Some real-world case =
134	134
135	135	== 5.1  Server reason cause end node has problem on Join. ==
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169	169	[[image:image-20221101000006-1.png||height="353" width="931"]]
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171	171
	170	+= 6. Use a repeater =
172	172
	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]]
	175	+
174	174