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Re: Reverse Problems

Like mentioned above, the pin discolors because of oxidation. 
 
In my experience, that oxidation, if not cleaned causes high end roll-off.    You get an impedance mismatch from your steel seizure screw penetrating into a alloy pin with oxidation between the two metals.   Causes a metallurgical reaction from the dissimilarities of the metals.   I had major rolloff from 700 meg to 870 meg.

Two ways to fix that:

Loosen the seizure and re-tighten, or clean the oxidation off the pin before you use it.   I had my techs start using an fine grit emory sponge to clean the oxidation off before building the part, and we never had the problem anymore.  Use that on all your pins, and H-H's, 90's, etc.   Sweep response and all looked sweet from there on out.

Remember that dissimilar metals can cause CPD.
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Posted in reply to: Re: Reverse Problems by goodsky
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