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@twobob : your microwave runs at the low end of the radar S-Band. That microwave serial port is physically larger than you might think.
@geekmaster : too much surface loss at S-Band for copper, your choices are silver or gold, but not too much of it, due to the "skin effect" at S-Band (and above / below S-Band).
PS: Do not use "Brasso" to polish the silver (or gold) - it leaves a film that destroys the surface conduction of the metal. Been there, made that mistake; spent a long weekend taking the radar cavities back apart and cleaning off the "Brasso" film.
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