Why can't openwifi work in lower frequency? such as 1.6/1.5/1.4 G…

[winfelin]

We use cables to connect two openwifi boards to make them work in adhoc mode. We tried different frequencies and found that communication was normal at 2.0G ~ 6.0G. When using lower frequencies, such as 1.6/1.5/1.4 G..., the two boards will not be able to communicate. What is the reason for this?

[Denisfk1985]

May be rx side overdrived when devices directly connected.
You can tried using attenuator.

[Dragon6879]

i set the arbitrary frequency with
./sdrctl dev sdr0 set reg rf 1 3500
it doesn't work,why