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Author

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1		-XWiki.Edwin
	1	+XWiki.Xiaoling

Content

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37	37
38	38	**End node actually value when TXP=0 and DR=0**
39	39
40		-(% border="1.5" cellspacing="4" style="background-color:#ffffcc; color:black; width:1002px" %)
41		-|(% style="width:134px" %)**Frequency band**|(% style="width:400px" %)**Output Power in LoRa Module (consider 2dB antenna)**|(% style="width:362px" %)(((
	40	+(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:1002px" %)
	41	+|(% style="background-color:#4F81BD;color:white; width:134px" %)**Frequency band**|(% style="background-color:#4F81BD;color:white; width:400px" %)**Output Power in LoRa Module (consider 2dB antenna)**|(% style="background-color:#4F81BD;color:white; width:362px" %)(((
42	42	**Spreading Factor(Higher SF can transmit further)**
43		-)))|(% style="width:102px" %)**Band Width**
	43	+)))|(% style="background-color:#4F81BD;color:white; width:102px" %)**Band Width**
44	44	|(% style="width:134px" %)**EU868**|(% style="width:400px" %)14dBm|(% style="width:362px" %)SF=12|(% style="width:102px" %)125Khz
45	45	|(% 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
46	46	|(% style="width:134px" %)**AS923**|(% style="width:400px" %)14dBm|(% style="width:362px" %)SF=12|(% style="width:102px" %)125Khz
47	47
48		-
49	49	== 2.2  Adaptive Data Rate (ADR) and set max distance ==
50	50
51	51
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59	59
60	60	(% style="color:#037691" %)**AT+ADR=0**
61	61
62		-(% style="color:#037691" %)**AT+DR=0  **~/~/(%%) Use longest distance modulation
	61	+(% style="color:#037691" %)**AT+DR=0     **~/~/(%%) Use longest distance modulation
63	63
64		-(% style="color:#037691" %)**AT+TXP=0   **(%%)~/~/Use max power   For EU868, max power can be is AT+TXP=50
	63	+(% style="color:#037691" %)**AT+TXP=0   **(%%)~/~/ Use max power   For EU868, max power can be is AT+TXP=50
65	65
66	66
67	67	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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72	72
73	73	According to the above technology, if we have a problem on the distance, we can first check if the end node is trying to longest distance modulation already. We can see that from the LoRaWAN server. Below is an example from Chirpstack.
74	74
75		-
76	76	We can see the traffic in gateway's page and know that the distance is SF12 / BW125. (note, server is not able to know Transmit Power settings from End Node)
77	77
78		-
79	79	[[image:image-20221006185826-3.png]]
80	80
81	81
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84	84
85	85	Below are the settings for longest distance transmission. ( will reduce battery life)
86	86
87		-* (% style="color:#037691" %)**AT+ADR=0**     (%%)~/~/  Disable ADR
88		-* (% style="color:#037691" %)**AT+DR=  0**     (%%)~/~/  Use the smallest DR,the longest distance modulation
89		-* (% style="color:#037691" %)**AT+TXP=0**    (%%) ~/~/  Use max power   For EU868, max power can be is AT+TXP=50
	84	+* (% style="color:#037691" %)**AT+ADR=0**          (%%)~/~/  Disable ADR  (% style="color:#037691" %)**(downlinkpayload: 2200FFFF)**
	85	+* (% style="color:#037691" %)**AT+DR=0**           (%%)~/~/  Use the smallest DR,the longest distance modulation (% style="color:#037691" %)**(downlinkpayload: 220000FF)**
	86	+* (% style="color:#037691" %)**AT+TXP=0**          (%%)~/~/  Use max power   For EU868, max power can be is AT+TXP=50 (% style="color:#037691" %)** (downlinkpayload: 22000000)**
90	90
	88	+== 2.5 Debug in Software ==
91	91
	90	+Dragino can help client to debug the software for the distance issue. In the case , please send us below info:
	91	+
	92	+* Detail packets include for Join Request, Join Accept, Uplink & Downlink, These packets should include:
	93	+** RSSI, DataRate, FCNT, Frequency.
	94	+** MIC command detail & Payload detail.
	95	+
92	92	= 3.  Analyze at the hardware side =
93	93
94		-== 3.1  Check if the antenna path is good ~-~- For LSn50v2 series end node ==
	98	+== 3.1  Check if the antenna path is good ~-~- For LSN50v2 series end node ==
95	95
96	96
97	97	a) Open Enclosure and Check if the antenna connection to module is good.
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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.
125	125
126		-
127	127	== 4.2  Improve the Antenna ==
128	128
129	129