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LGT-92 LoRa GPS Tracker User Manual
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6.6
How to set up LGT-92 to work in 8 channel mode in US915, AU915, CN470
band
s
?
By default, the frequency bands US915, AU915, CN470 works in 72 frequencies. Many gateways
are 8 channel gateways, in such case, the OTAA joined time and uplink schedule is
long and
unpredictable
while the end node hopping in 72 frequencies.
User can configure the end node to work in 8 channel models by using the AT+CHE command,
the 500kHz channels are always includes for OTAA.
For example
, in US915 band, the frequency table is as below. By default, end node will use all
channels (0~71) for OTAA Join process. After OTAA JOINED, end node will use these all channels
(0~71) to send uplink packets.
CHE
US915 Uplink Channels(125KHz,4/5,Unit:MHz,CHS=0)
0
ENABLE Channel 0-63
1
902.3 902.5 902.7 902.9 903.1 903.3 903.5 903.7
Channel 0-7
2
903.9 904.1 904.3 904.5 904.7 904.9 905.1 905.3
Channel 8-15
3
905.5 905.7 905.9 906.1 906.3 906.5 906.7 906.9 Channel 16-23
4
907.1 907.3 907.5 907.7 907.9 908.1 908.3 908.5 Channel 24-31
5
908.7 908.9 909.1 909.3 909.5 909.7 909.9 910.1 Channel 32-39
6
910.3 910.5 910.7 910.9 911.1 911.3 911.5 911.7 Channel 40-47
7
911.9 912.1 912.3 912.5 912.7 912.9 913.1 913.3 Channel 48-55
8
913.5 913.7 913.9 914.1 914.3 914.5 914.7 914.9 Channel 56-63
Channels(500KHz,4/5,Unit:MHz,CHS=0)
903
904.6 906.2 907.8 909.4
911
912.6 914.2 Channel 64-71
When user uses the TTN network, the US915 frequency bands use are:
903.9 - SF7BW125 to SF10BW125
904.1 - SF7BW125 to SF10BW125
904.3 - SF7BW125 to SF10BW125
904.5 - SF7BW125 to SF10BW125
904.7 - SF7BW125 to SF10BW125
904.9 - SF7BW125 to SF10BW125
905.1 - SF7BW125 to SF10BW125
905.3 - SF7BW125 to SF10BW125
904.6 - SF8BW500
Because the end node is now hopping in 72 frequency, it is makes the devices hard to Join the
TTN network and uplink data. To solve this issue, user can access the device via AT Command and
run:
AT+CHE=2
ATZ
