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| Is oxide on surface of RF conductor problem? |
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| fonograph:
--- Quote from: In Vacuo Veritas on July 26, 2018, 07:54:34 pm ---https://www.pcdandf.com/pcdesign/index.php/editorial/menu-features/12498-rf-circuits-1803 --- End quote --- Thanks for that link,that was honestly one of best electronic engineering articles I have ever read,very clearly written and packed with tons of usefull information. |
| firehopper:
--- Quote from: fonograph on July 26, 2018, 09:01:50 pm --- --- Quote from: qno on July 26, 2018, 08:45:07 pm ---Good RF connectors are silver player. Silver oxide is An excellent conductor. Silver turnsters black when oxidized. --- End quote --- Correct me if I am wrong but I believe silver is noble metal,it doesnt oxidize in normal atmosferic conditions.That silver tarnish is actually silver sulfide which is neither conductor or insulator,its semiconductor with 1.08 eV bandgap. --- End quote --- silver does oxidize in normal conditions. its called tarnish |
| fonograph:
--- Quote from: firehopper on July 27, 2018, 12:05:01 am --- --- Quote from: fonograph on July 26, 2018, 09:01:50 pm --- --- Quote from: qno on July 26, 2018, 08:45:07 pm ---Good RF connectors are silver player. Silver oxide is An excellent conductor. Silver turnsters black when oxidized. --- End quote --- Correct me if I am wrong but I believe silver is noble metal,it doesnt oxidize in normal atmosferic conditions.That silver tarnish is actually silver sulfide which is neither conductor or insulator,its semiconductor with 1.08 eV bandgap. --- End quote --- silver does oxidize in normal conditions. its called tarnish --- End quote --- I think what you call silver is really a silver copper alloy,most "silver" isnt really pure silver.The mixed silver does oxidize,but its the copper and other stuff inside it,not the silver itself.Pure silver is highly oxidation resistant,its the hydrogen sulfide which is in air in small amounts that causes pure silver to tarnish,its not an oxide. From wikipedia "Tarnish does not always result from the sole effects of oxygen in the air. For example, silver needs hydrogen sulfide to tarnish, although it may tarnish with oxygen over time." |
| T3sl4co1l:
Skin depth depends on resistivity. A micron of insulating oxide has infinite skin depth, and current continues on to the actual surface of the metal. I always find it amusing when people talk about -- oft quoted but always unsupported -- reasoning, like silver oxide being conductive. (Of course, silver doesn't oxidize in air, it sulfidates.) No, a lossy material (moderate resistivity) is always more lossy than an un-lossy material (very high or very low resistivity). More important is having connectors that properly wipe, so that metal-oxide contact is shorted out by metal-metal contact. You can still get some higher order effects, like THD/IMD due to nonlinear oxides. Bare nickel plating is notorious for this. Tim |
| fonograph:
--- Quote from: T3sl4co1l on July 27, 2018, 01:49:12 am ---You can still get some higher order effects, like THD/IMD due to nonlinear oxides. Bare nickel plating is notorious for this. --- End quote --- Can you please tell (write) me more about these non-linearities? I was reading on some RF connector manufacturer sites and I read something about some kind of nonlinearity/distortion being created at the point of contact.I also read something about these surface oxide acting like diode or rectifier,distorting signal.Any word of wisdom or even better,some link to great article would be welcome. |
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