> On Feb 23, 2018, at 6:17 PM, jimlux <jim...@earthlink.net> wrote:
> On 2/23/18 1:33 PM, Bob kb8tq wrote:
>>> On Feb 23, 2018, at 4:23 PM, Attila Kinali <att...@kinali.ch> wrote:
>>> Hoi Bob,
>>> On Thu, 22 Feb 2018 21:58:09 -0500
>>> Bob kb8tq <kb...@n1k.org> wrote:
>>>> 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 …..
>>> Interesting. About what frequency range are you talking?
>> UHF up into microwaves. It was part of a lecture back when I was in school …
>> assume the basic physics hasn’t changed since then :)
> Passive intermodulation distortion? What is the physics... hysteresis curves
> in the magnetization of the nickel is what I would suspect.
It turns out that the nickel’s really awful magnetic properties at RF get it
into all sorts
of problems. More or less, the issue is the non-linear field response in the
of the nickel. You go from “reasonable skin depth” to “don’t go there” in zero
when you hit the nickel plating. Past that it gets a bit complicated and it was
a very long
time ago ….
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