Hi @josh77
You are correct; Notecard and onboard LoRa radio will calculate the valid parameters (SF, bitrate, etc.) to be compliant with the protocol (LoRaWAN) and regional requirements.
Theoretically, you could transmit as frequently as every ~30 seconds, but that would be high usage for a mobile LoRaWAN (I assume, a battery-powered) device, so your major constraint would be likely power consumption.
You should also consider that this will increase the risk of interference and packet collisions if you were transmitting in a congested area, given the relative size of your payloads. There are a lot of factors involved here, so I wouldn’t want to definitive advice, but I think you would be pushing the LoRaWAN protocol quite hard given your constraints.
Transmitting at that frequency would traditionally be better suited to a device that maintains an open connection with the network, such as a cellular connection.
Thanks,
Alex