I'm in the process of building a LoRa end device, and am also designing protocol. I plan on using the channels specified in the AUS915 ISM Band as outlined in the LoRaWAN regional parameters (though i'm not using LoRaWAN):
- Upstream Channels 0 to 63,125KHz, DR0 to DR5, 915.2MHz-927.8MHz, 200kHz inc.
- Upstream Channels 64 to 71,500KHz, DR6, 915.9MHz-927.1MHz, 1.6MHz inc.
- Downstream Channels 0 to 7,500KHz, DR8 to DR13, 923.3MHz-927.5MHz, 600KHz inc.
I'm confused about the typical operation of an end device. Does this channel plan suggest that to use an end device effectively and this channel plan, I will need to send data from it on any of the 72 upstream channels, but have to switch configuration entirely to then recieve packets in one of the 8 downstream frequencies?
From the Radiocommunications (Low Interference Potential Devices) Class Licence 2015:
- All transmitters, 915–928MHz, 3 mW max EIRP
- Frequency hopping transmitters, 915–928MHz, 1 W max EIRP, A minimum of 20 hopping frequencies must be used
- Digital modulation transmitters, 915–928MHz, 1 W max EIRP, The radiated peak power spectral density in any 3 kHz must not exceed 25 mW per 3 kHz