Hardware
Semtech LR2021 radio
Internal firmware version
FWMajor: 0x01
FWMinor: 0x18
To reproduce
- take 2 of LR2021 nodes
- use https://github.com/Lora-net/usp/tree/main/examples/main_examples/packet_error_rate_fsk_example example on both sides
- change FSK_BITRATE to 1000000 in the
packet_error_rate_fsk_example example source code, update deviation and bandwidth values accordingly
- run the
packet_error_rate_fsk_example on both sides - it should work nicely
- change FSK_BITRATE to 1041000 and update both connection partners
- the
packet_error_rate_fsk_example example no longer works properly
Expected behavior
GFSK modem of LR2021 radio should work with 1041 kbps data rate (in use by ADS-B UAT @ 978 MHz in North America and UK)
Actual behavior
It looks for me that Transmitter component works fine with 1041 kbps bitrate.
1041 kbps GFSK packets sent by LR2021 can be received by an SDR radio or Texas Instruments CC1352 receivers.
However, the LR2021 Receiver component does not work properly with 1041 kbps bitrate. Received data is corrupt and looks like been down sampled to a fixed data rate, such as 1000 kbps.
Hardware
Semtech LR2021 radio
Internal firmware version
FWMajor: 0x01
FWMinor: 0x18
To reproduce
packet_error_rate_fsk_exampleexample source code, update deviation and bandwidth values accordinglypacket_error_rate_fsk_exampleon both sides - it should work nicelypacket_error_rate_fsk_exampleexample no longer works properlyExpected behavior
GFSK modem of LR2021 radio should work with 1041 kbps data rate (in use by ADS-B UAT @ 978 MHz in North America and UK)
Actual behavior
It looks for me that
Transmittercomponent works fine with 1041 kbps bitrate.1041 kbps GFSK packets sent by LR2021 can be received by an SDR radio or Texas Instruments CC1352 receivers.
However, the LR2021
Receivercomponent does not work properly with 1041 kbps bitrate. Received data is corrupt and looks like been down sampled to a fixed data rate, such as 1000 kbps.