I am just about done resurrecting a E4407B that I just acquired. The last issue is the RF step attenuator. Stepping from 0dB to 25dB in 5 dB steps works fine. All steps above 25dB fail. I suspect that this attenuator has 4 pads:
5dB,10dB,20dB and 30dB
I suspect that the 30dB pad is bad. Does anyone have 30dB pads for these or have an attenuator where the 30dB pad is good? This is a DC-26.5GHz attenuator.
Thanks!
Sam
W3OHM
Sam Reaves