As I know AD9361 Rx gain can control by pulse mode control.
Could I use pulse mode to control the Tx attenuation index?
No , there is no option to control Tx attenuation/ gain using pin control mode.
Normally the variation in Tx power with temperature is slow and you do not need a real time control from Baseband. Is there a specific requirement in your system to control gain directly from baseband in real time.
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