On 8/20/2019 4:16 PM, Wes wrote:
I agree. Also when going to gold, most (all) commercial plating shops
will put down a nickle barrier on the base metal then plate with gold.
If the gold is too thin and the skin depth too deep, your gold surface
is RF wise, actually nickle.
True, however the 5071A cesium standard is a special case.
The sections where Q matters use unplated OFHC copper
inside the vacuum of the cesium beam tube. Typical
RF connectors have 35 microinches of hard gold which
is about 1 skin depth at 9.2 GHz. That's good enough for the
parts that are in air.
Rick N6RK
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|