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1		-**Table of Contents:**
2		-
3		-{{toc/}}
4		-
5		-
6		-
7	7	= OverView =
8	8
9	9	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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19	19
20	20	* **Data Rate(DR): **This is a combination of Spreading Factor and Band Width. Lowest Data Rate (DR=0) always has the longest transmit distance in LoRaWAN protocol.
21	21
	16	+
22	22	Below is the TXPower and DR table of EU868 Frequency band as reference.
23	23
24	24	[[image:image-20221006185826-1.png]]
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40	40	|**US915**|20 or 22 dBm (depends on max output of module)|SF=10|125Khz
41	41	|**AS923**|14dBm|SF=12|125Khz
42	42
	38	+
43	43	== Adaptive Data Rate (ADR) and set max distance ==
44	44
45	45	ADR is the feature that Server will ask End Node to adjust the TXP and DR according to some rules in the server. This is for the purpose of Network Management and Optimize End Node battery life-time.
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72	72
73	73
74	74
75		-== Best software settings for the longest distance ==
76	76
77		-Below are the settings for longest distance transmission. ( will reduce battery life)
78	78
79		-* AT+ADR=0 ~/~/ Disable ADR
80		-* AT+DR=0 ~/~/ Use the smallest DR
81		-* AT+TXP=0 ~/~/ Use max power.
82		-
83		-
84		-
85		-= Installation Guidelines =
86		-
87		-== Check the use environment ==
88		-
89		-First , User should notice: Radio link quality and performances are highly dependent of the environment.
90		-
91		-Better performances can be reached with:
92		-
93		-* Outdoor environment.
94		-* No obstacles.
95		-* No high level radio interferes in the ISM band you use.
96		-* At least 1 meter above the ground.
97		-
98		-Radio performances are degraded with:
99		-
100		-* Obstacles: buildings, trees...
101		-* Inner buildings environments.
102		-* High ISM band usage by other technologies.
103		-* Radio communication are usually killed with bad topographic conditions. It is usually not possible to communicate through a hill, even very small.
104		-
105		-== Improve the Antenna ==
106		-
107		-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.
108		-
109		-
110	110	= Some real-world case =
111	111
112	112	== Server reason cause end node has problem on Join. ==