[Q&A] What is the Mimimum Bandwidth Current Devices can Reliably Use?

[Ryu945]

What is the minimum bandwidth current devices can reliably use?

Someone told me they were sure all devices could use 125 KHz bandwidth reliably but they thought that devices with bad oscillators can't do less then that.

Does anyone have data on the lowest bandwidth the different Meshtastic devices can use reliably?

[korbinianbauer]

+- 10 ppm oscillators are common, but the device manufacturer does not always communicate what's actually in their devices.

Semtech claims their radios can deal with frequency offsets up to 25% of channel bandwidth.

At +-10 ppm, the minimum bandwidth would be 73.2 kHz @ 915 MHz or 69.4 kHz @ 868 MHz.

The lowest available LoRa bandwidth therefore would be 125 kHz.

[Ryu945]

Thankyou for the information. Then using 62.5 kHz as a improved version of Long Slow wouldn't work or for any use case for that matter since 62.5 kHz can't be done in a stable manner.