TNP #31 - HP 87421 & 83017A 26.5GHz Microwave System Amplifier Teardown, Repair & Experiments
In this episode Shahriar repairs an HP 87421 power supply in order to revive a HP 83017A 0.5-26.6GHz Microwave System Amplifier. The power supply has multiple bad capacitors which can be readily exchanged. An X-ray of a bad versus good capacitor is also shown. A custom cable must be made and the pinouts of each module should be revers engineered.
The amplifier successful powers on and various performance metrics are measured. S-parameters, noise figure, PSAT, OIP3 and detector are all measured and verified. The instrument used are the Keysight FieldFox, Junkosha RF cables, R&S NRP power sensor, R&S SMB RF Vector Generator and R&S ZNL20 real-time spectrum analyzer / network analyzer hybrid.
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