SWDR001

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Description:
We have observed unexpected behavior in the LR1121 radio module related to the raw data rate when using varying payload sizes. While the datasheet specifies a payload capacity of 0-255 bytes, our findings indicate that the achieved data rate is inconsistent with expectations unless the maximum payload size is used.

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Observed Behavior:

1. When we use the maximum payload capacity (255 bytes), the raw data rate aligns with the values mentioned in the datasheet and theoretical calculations.
2. However, when we send a smaller payload (less than 255 bytes), the raw data rate decreases proportionally.

Expected Behavior:
The raw data rate should not depend on the payload size, as long as it is within the specified range (0-255 bytes). We expect consistent performance as per the datasheet regardless of the payload length.

Concern:
Generally, such behavior is not acceptable and not considered a best practice for radio modules. There is no mention of such a restriction in the official documentation, and this behavior may affect performance in real-world applications.

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Steps to Reproduce:

1. Configure the LR1121 with the following parameters:
   • Payload Size: Variable (0-255 bytes)
   • Modulation: LoRa
2. Transmit data with different payload sizes.
3. Observe the raw data rate at the receiver end.

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Environment Details:

• Device: LR1121
• Firmware Version: Release v2.3.0
• Payload Sizes Tested: [9, 16, 26, 32, 48, 250]
• Modulation Settings: [Insert modulation type and configuration]
• Platform: LR1121 DevKit

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Request for Clarification:
Could you please confirm if this behavior is expected? If not, is there any known workaround or firmware update to resolve this?

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Attachments:

• Measure Date Test Result Sheet :
• Expected Test Result as per the LoRa Calculator