regional-channels.md

Regional Channels & Data Rates

LoRaWAN US915 Uplink Channels

All channels in 0-63 in US915 have a bandwidth of 125 KHz, encoding of 4/5 bit encoding, and permit data rates (DR) 0-3.

Helium uses sub-band 2 as detailed in the table below. (The channel frequencies described in MHz.)

Sub-band									Channels
1	902.3	902.5	902.7	902.9	903.1	903.3	903.5	903.7	0-7
2 (Helium)	903.9	904.1	904.3	904.5	904.7	904.9	905.1	905.3	8-15
3	905.5	905.7	905.9	906.1	906.3	906.5	906.7	906.9	16-23
4	907.1	907.3	907.5	907.7	907.9	908.1	908.3	908.5	24-31
5	908.7	908.9	909.1	909.3	909.5	909.7	909.9	910.1	32-39
6	910.3	910.5	910.7	910.9	911.1	911.3	911.5	911.7	40-47
7	911.9	912.1	912.3	912.5	912.7	912.9	913.1	913.3	48-55
8	913.5	913.7	913.9	914.1	914.3	914.5	914.7	914.9	56-63

In addition, there are channels number 64-72 which have a bandwidth of 500 kHz, encoding of 4/5 bit encoding, permitting data rate 4 only.

Helium uses channel 65.

Channel	Frequency (MHz)
64	903.0
65 (Helium)	904.6
66	906.2
67	907.8
68	909.4
69	911.0
70	912.6
71	914.2

LoRaWAN US915 Uplink Data Rates

The uplink data rates correspond to specific configurations as details below. Note how the BW of DR0-3 match the channels on which it is tolerated (0-63). Similarly, DR4 is only tolerated on channels 64-72.

Max application payload is given assuming the absence of the optional FOpt MAC Control field.

Data Rate (DR)	Spreading Factor (SF)	BW (kHz)	Physical bit/s	Max Application Payload
0	10	125	980	11
1	9	125	1,760	53
2	8	125	3,125	125
3	7	125	5,470	242
4	8	500	12,500	242

LoRaWAN US915 Downlink Channels

Channel	Frequency (MHz)
0	923.3
1	923.9
2	924.5
3	925.1
4	925.7
5	926.3
6	926.9
7	927.5

LoRaWAN US915 Data Rates & Spreading Factors

Max application payload is given assuming the absence of the optional FOpt MAC Control field.

Data Rate	Spreading Factor (SF)	BW (kHz)	Physical bit/s	Max Application Payload
8	12	500	980	53
9	11	500	1,760	125
10	10	500	3,900	242
11	9	500	7,000	242
12	8	500	12,500	242
13	7	500	21,900	242