[time-nuts] HP 5065A super

Bob kb8tq kb8tq at n1k.org
Thu Feb 22 21:58:09 EST 2018


The same nickel plating effect gets into a lot of things. If you are shopping for very 
low IMD connectors, nickel plating is out. Things get non-linear (to a very slight 
degree) when it is present. If -180 db is the goal for those spurs, you might only
hit -120 db with the nickel connectors …..


> On Feb 22, 2018, at 9:15 PM, jimlux <jimlux at earthlink.net> wrote:
> On 2/22/18 12:29 PM, Leo Bodnar wrote:
>> Here is ENIG fact that is not widely known at the moment but which some might find useful.
>> I could not understand why I get better TDR and insertion loss results from solder-mask covered microstrip transmission lines than from otherwise identical microstrips on the same substrate with soldermask removed and, therefore, covered with ENIG.
>> Gold can't be bad, right? As it turns out, even gold coin has two sides to it.
>> I have found that Shlepnev and McMorrow conducted extensive research and published data, some of which is presented here http://www.simberian.com/Presentations/NickelCharacterizationPresentation_emc2011.pdf
> the ever useful http://www.microwaves101.com/ site has an excellent discussion of this under the "skin effect" heading.
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