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Chapter 2. Hardware Architecture - SoM module
2.2
Operating frequency bands
2.2.1
EU 863-870MHz ISM Band
In the European region the EN300220-2 V3.1.1 (2017-02) regulation defines the allowed frequency
allocation and spectrum access. Every device working in this band must comply with these rules
as shown in the Table 2.3. EU regulations restrict the maximum radiated power as well as the duty
cycle of the transmission in different frequency bands.To comply with the duty cycle requirement the
transmitting device must wait after every transmitted packet. The time device has to wait depends
on the time on air of transmitted packet and this in turn depends on the length of the packet and
spreading factor SF. This relation and required wait time can be seed in Table 2.2 According to
LoRaWAN specification every device has to implement at least 3 channels as follows:
•
868.10 MHz
•
868.30 MHz
•
868.50 MHz
The SoM is preconfigured to work with the MatchX Box gateway and additionally to the 3 mandatory
channels 5 additional channels are defined. The list of all preconfigured channels can be found in
Table 2.4.
Spreading Factor
Bit rate
Range (depends
Time on air (ms)
0.1% duty cycle
1% duty cycle
(125kHz Lora)
(bps)
on conditions)
(10 bytes payload)
waiting time
waiting time
SF7
5470
2 km
56 ms
1 min
6s
SF8
3125
4 km
100 ms
1 min 40s
10s
SF9
1760
6 km
200 ms
3 min 20s
20s
SF10
980
8 km
370 ms
6 min 10s
37s
SF11
440
14 km
740 ms
12 min 20s
1 min 14s
SF12
290
20 km
1400 ms
23 min 20s
2min 20s
Table 2.2: Modules operating frequencies.
2.2.2
US 902-928MHz ISM Band
These frequencies band can be used in USA, Canada and all other countries that adopt the entire
FCC-Part15 regulations in 902-928 ISM band. For these region MatchX uses predefined frequencies
listed in Table 2.5. The FCC regulation puts restriction on the maximum dwell time of 400ms in
uplink, thats why the maximum allowed spreading factor is SF10.
2.2.3
Australia 915-928MHz ISM Band
These frequencies band can be used in Australia region. For these region MatchX uses predefined
frequencies listed in Table 2.6. All channels use 125kHz bandwidth and maximum of +20dBm
output power can be reached.
