TSP #194 - Teardown, Repair & Experiments with a Marconi 2186 130dB 5GHz Programmable Attenuator
In this episode Shahriar repairs an IFR (Marconi) 5GHz programmable attenuator capable of reaching a maximum of 130dB attenuation in 1dB steps. The Instrument does not power on and a teardown reveals some missing components inside. After replacing the missing component, the instrument powers on but the S-Parameters show that the mechanical attenuators have serious contact problems. Finally after cleaning the attenuator contacts, the instrument is fully operational. The unit is used to measure the performance of the Keysight MXR at very low input signal powers.
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