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General microwave switch type 1699 details needed

Peter Hansen All Messages By This Member #144082 开云体育 Hello I got a microwave switch from General Microwave model 1699. It is a pin diode switch 0.1Ghz to 20Ghz.? It comes from a hp 8720B They are used to switch around the RF path in the source. Would I be so lucky you know what voltages is needed to operate the switch without ruining the switch There are 2 pins called LGC. what does LGC mean ?? best regards Peter
Ed Breya All Messages By This Member #144086 I don't know what the "LGC" means - I can picture "GC" for gain control of some sort, then "L" must be something specific to the unit or application. Instead of voltage drive, look at current through the PIN diodes. If you don't have any info about the internal structure, assume you'll have some diodes pointing in various directions, between RF ports, and to ground. On and off function is much simpler than variable attenuation control. The easiest way to figure out the PIN arrangements is to use a curve tracer, but ohmage/dode test readings can do it too, with enough interpretation. With a CT, you'll see right away if there's significant series R that could set a voltage drive range, but I'd guess it's all diodes via RF chokes for isolation, and the currents are set up by external Rs. This is the most flexible arrangement. Figure on needing a few tens of mA forward for ON diodes, and a few V reverse bias for OFF. Good luck.
Ed Breya All Messages By This Member #144087 Also, if you have the manual/schematics for the application, you can figure out the arrangements and currents necessary. Ed
Peter Hansen All Messages By This Member #144088 开云体育 Hello Ed I know it is a switch and does not have? schematics for it. I hope someone has some info would not like to burn the nice switches by adding wrong voltages. Maybe someone owning a8720A or B is willing to open it and measure the voltages for me best regards Peter Fra: [email protected] <[email protected]> p? vegne af Ed Breya via groups.io <edbreya@...> Sendt: 7. maj 2024 07:50 Til: [email protected] <[email protected]> Emne: Re: [HP-Agilent-Keysight-equipment] General microwave switch type 1699 details needed ? Also, if you have the manual/schematics for the application, you can figure out the arrangements and currents necessary. Ed
paulswed All Messages By This Member #144097 Hello to the group. I downloaded the service manual on the unit. Quite a nice unit. However its also at the point that HP stopped including schematics. So the manual is of no use. Not even sure it had a block diagram. Good luck Paul. WB8TSL
Harold Foster All Messages By This Member #144099 Info in this link:
Dave_G0WBX All Messages By This Member #144105 I thnk Ed meant, schematics and info for the HP product it was used in.? (The HP8720B) That should tell you what is needed to use it correctly. Nothing like a little reverse engineering from a good quality schematic. 73. Dave 'KBV. -- Created on and sent from a Unix like PC running and using free and open source software:

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