On Mar 10, 2025, at 7:38?AM, John G0SDF via groups.io <jatkins295@...> wrote:

?

The transmit attenuator is working in that the amount of attenuation is able to be adjusted by the setting in the Menu.

However at the 0dB attenuation setting I am getting -3dB. I have a 50 ohm load on RF_OUT (J6) on the RF Board.

I am testing this on CW and the peak to peak signal (ignoring overshoot) going into the attenuator chip (U12) is 980mV

but the peak to peak signal out is only 696mV.

Has anyone else measured the performance of the transmit attenuator?