Do you need a coupler to fix your network analyzer?
I have a repaired 5087-6007 coupler which should fit the 8753D, E, ES or ET or the 85047A test set.
It was presumably blown out with applied RF killing the 3 resistors in the broadband coupler.? I replaced them with surface mount parts.? Uncorrected performance does not meet the published specs, especially near the high end, but the coupler works fine with corrections on.
Be aware that any unit with a blown coupler likely also had damage to the source switch.? Sometimes that can be corrected by removing the protection diodes in the switch:? They tend to go shorted when overloaded, saving the rest of the circuitry in the switch.
The coupler is free for pickup in the Los Angeles area, or I can send it to a USA destination by USPS.
For those interested in the history of this coupler design, attached is an article by Joel Dunsmore describing how the coupler works.
Contact me directly if interested:? johngord (at) verizon (dot) net
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--John Gord
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