I purchased an R&S FSP-30 on Ebay which had a defective system disk. After replacing the disk and rebuilding the system firmware, I saw that the step attenuator is also defective. After determining that all 3 attenuator pads were burned out (measuring ca.400k, 8.2M and 530k for the 10, 20 and 40 dB pads respectively) I decided to take the step attenuator apart and attempt repairing it. The pads are soldered into removable brass fixtures. I am trying to source the individual pads to be able to attempt replacing them. The fixtures measure ca 10.7mm x 5.1mm x 4.9mm and the pads measure ca. 5mm x 2.5mm. Has anyone already attempted repair of this step attenuator and/or have any references for sourcing either the pads alone or fixtures with pre-mounted pads? Thanks for any help.
Hallo, ich habe zwar keinen R&S FSP30, wohl aber den zugehörigen Step ATTENUATOR (Bild als ANLAGE); für ein vernüftiges Angebot bin ich bereit den abzugeben. Gruß Gerd
If the attenuator is fully burned, mostly the first mixer is also dead. Before you change the attenuator, check the LO Level at 0 Hz. This will give you an indication if the first mixer is working. Maybe a internal test is partly working. Here are some Basics in german: https://www.yumpu.com/de/document/view/22263368/grundlagen-der-spektrumanalysepdf-ing-h-heuermann
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