switch diode question
Repairing an old test equipment ( IFR com-120) I suspect that the two switch diodes in the sampler phase detector are not as equal anymore as they should be.
The diodes are MA-com MA4E282, matched pair. But it seems impossible to source them, or even find a datasheet to find a suitable replacement. Info on the web indicates that those were specially made for IFR by MA-com. I'd be most grateful if anyone has some info on them.
The circuit is a sampling phase detector, locking at 1300-2200 MHz in 2 MHz steps, SRD operated with 2 MHz pulses fed to the SRD. There must be some HP diodes that can be used...
You might try Microsemi
Their web site states:
"Microsemi also can offer a significant number of existing configurations to minimize your NRE and provides many customers with microwave components no longer available from their original suppliers. Microsemi's extensive library of products and designs gives us the ability to respond quickly with solutions to meet your needs, quickly and cost effectively."
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