When I increase clockwise the WXR radar gain knob, the clouds images vanish.

Both B767's and B757's built-in radar gain knobs work fine.

Anyway, when I use both radars (built-in and stand alone) there are significant differences between the receveid images.The built-in ones are more sensible than WXR.

Does anyone know how to fix it?

Thanks,

Pinatubo.