LOS range for Channel 9 if one uses DW3120 (QM33120 EVB)

Hi all,
The LOS transmission range was measured by different conditions.
However, it is found that LOS transmission range is really short if one uses EVB @channel 9.
Channel9 seems to be the worst case for transmission range.
Is the measurement result expected?
Thanks for any provided suggestion indeed.

Hi @Yin ,

What are the antennas you’re using? Also the orientation would have an impact on these measurements. And what’s the transmit power in this use case?