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Looking for help with an HP 8554B spectrum analyzer plugin
Greetings...
I don't know where to ask this, so I'm shooting for multiple groups. I purchased an HP 140T mainframe plus spectrum analyzer plugins, including the 8554B mentioned in the subject, at a hamfest. It turns out that it is working but is quite "deaf." From asking around I have been told that this is a common problem for this plugin and the culprit is the first mixer. Well... the first mixer is an upconverter to 3 GHz, and one of those magical microwave "cans" that make no sense to those of us used to thinking in lower frequencies. The only semiconductors in the can are a pair of diodes, back to back, with the designation "385" on them. HP weenies have suggested that it could be short for 1901-0385, but that part number turns up very few references, and none with the nature of the diodes and their operating characteristics. So I'm wondering if anyone out there knows what type of diodes these are likely to be and what kind of characteristics I should be looking for in replacement parts. Does anyone know anything about this dinosaur? Any help would be appreciated. Oh, BTW, the rest of the analyzer and frame work fine. I'm using a borrowed 8553B plugin with it now and getting the results I'd hoped for. While I don't plan on doing any critical work with it, the 8554B is a more capable plugin and I do have to return the borrowed one... Thanks much! -- Eric F. Richards, "Nature abhors a vacuum tube." -- J. R. Pierce, Bell Labs, c. 1940 |
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