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1		-XWiki.ting
	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:#f2f2f2; width:1002px" %)
41		-|(% style="background-color:#d9e2f3; width:134px" %)**Frequency band**|(% style="background-color:#d9e2f3; width:400px" %)**Output Power in LoRa Module (consider 2dB antenna)**|(% style="background-color:#d9e2f3; 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="background-color:#d9e2f3; 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
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72	72	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.
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74		-
75	75	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)
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77		-
78	78	[[image:image-20221006185826-3.png]]
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84	84	Below are the settings for longest distance transmission. ( will reduce battery life)
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86	86	* (% style="color:#037691" %)**AT+ADR=0**          (%%)~/~/  Disable ADR  (% style="color:#037691" %)**(downlinkpayload: 2200FFFF)**
87		-* (% style="color:#037691" %)**AT+DR=0**         (%%)~/~/  Use the smallest DR,the longest distance modulation (% style="color:#037691" %)**(downlinkpayload: 220000FF)**
88		-* (% style="color:#037691" %)**AT+TXP=0**      (%%)~/~/  Use max power   For EU868, max power can be is AT+TXP=50 (% style="color:#037691" %)** (downlinkpayload: 22000000)**
	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)**
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90	90	== 2.5 Debug in Software ==
91	91