Look at the frequencies of interest.
We also do not have to worry about the surface roughness, so do not need to polish the wires.
John
I agree.
But witness reported what they see, with personal "sensors"
And, they do not need science for report.
Ok, someone hear something in audio gear, and share experience with other, but why do they need scientific approval?
I do not see any doubt in personal "sensors", ear- brain.
Well, some of them seek more knowledge..but others..trying to explain science is wrong?
The 'rusty bolt effect' has been well known to RF engineers (and amateurs) for not far short of a century. I suspect some attempt here to conflate contact effects with wire surface effects. Note that, unlike communications engineering, in audio we have quite a limited dynamic range. We don't have efficient coupling between one system's speakers and another system's source, unlike a cellphone basestation tower.john curl said:
Usually "antique" PL-259 & SO-239, and then some BNC, some Type N.
None with stainless barrels, none.
Older ones were brass with silver plate.
Phenolic insulators.
Newer are sometimes gold plated center pins, and "teflon" insulators.
The better quality ("real") connectors are still silver plate, the import China are WTF metal is that, probably a flash of silver with Rhodium.
_-_-bear
Look in any RF connector catalog; Pasternak (sp?) or Bracke Mfrg. etc.
Plated brass, SS, silver, gold. There are variations, to be sure but all are better than stock RCA for corrosion and oxide resistance (except silver). bad idea to use silver on a contact which isnt air tight seal and is not 'exercised' to break the oxide film, periodically.
Also, Best to use same mfr for male-female so you dont get dissimilar metal corrosion and effects.
THx-RNMarsh
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The great site for those effects was Mount Wilson. You could have a change in a photometer reading by tightening a rack screw.
I used to joke that the RF was so high level as to present a health hazard, so one used a machine-dispensed burrito intended to be microwaved by the normal customer. You put it in your pocket, and when the cheese started to melt you were advised to get off the mountain.
That's no worse than any other type of industrial animal farming.
The reality is you can source good foie gras from places that don't treat the ducks that way. In France it's a right in the constitution to have foie gras. On healthy farms the ducks all come to the feeding station at the same time every day waiting to be fed. They get in a line, and one by one walk up to the person, open their mouth and look up. Then a funnel is placed in their mouth and food is poured it. And legally to be foie gras the feeder has to push the food at the end with their finger (this is law that was passed because people would sell low grade foie gras for full price). However the duck doesn't run away necessarily. They'd stick around and feed till they're sick if they had it their way. So the feeder pushes them out of the way and feeds the next hungry duck. Maybe their livers don't swell to the size the industrial cruelty places do, but the quality is good and the ducks are happy.
You may find some SS outer barrels, akin to Lemo types or even XLR, but these are not carrying any signal, they're just making a physical connection for the most part. Maybe a DIN??
Why would anyone want SS?? In a corrosive environment? Maybe in a liquid tight connector then?
I've been a ham since 1965 and have yet to see a single stainless connector in any ham station - and I can't think of seeing any RF connectors like that either.
Ymmv, as always.
Maybe you are still in 1965?
Nearly Every maker of rf connectors has SS types.
https://cinchconnectivity.com/OA_MEDIA/catalog/pdf_SSConnectorBrochure.pdf
https://www.powell.com/item/TE-Conn...bT5A7vcC_4ab-pRyzfeuxKwoyXddbaq8sHhoCt7rw_wcB
http://www.rfcoaxconnectors.com/Technical_wp-OptimizeConnections.htm See section on - Comparing building materials.
https://www.pasternack.com/n-connectors-category.aspx
ETC ETC !!
ETC.
THx-RNMarsh
Nearly Every maker of rf connectors has SS types.
https://cinchconnectivity.com/OA_MEDIA/catalog/pdf_SSConnectorBrochure.pdf
https://www.powell.com/item/TE-Conn...bT5A7vcC_4ab-pRyzfeuxKwoyXddbaq8sHhoCt7rw_wcB
http://www.rfcoaxconnectors.com/Technical_wp-OptimizeConnections.htm See section on - Comparing building materials.
https://www.pasternack.com/n-connectors-category.aspx
ETC ETC !!
ETC.
THx-RNMarsh
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Gold thickness requirments to prevent oxidation/corrosion. ---
Gold plating thickness required for connector
THx-RNMarsh
Gold plating thickness required for connector
THx-RNMarsh
Richard,
From RF industries:
Show Product
ALL of their PL-259 connectors are silver plated.
I do see one of your links is to a SS SMA jack... but most of them that i see are gold plated or else
nickel... not many hamshacks are awash in SMA jacks, unless ur doing UHF and low power... or going
board to board with some sort of homebrew...
I'll take a look for BNCs from one of the other specialty mfrs... see if they make
SS ones or not.
_-_-
From RF industries:
Show Product
ALL of their PL-259 connectors are silver plated.
I do see one of your links is to a SS SMA jack... but most of them that i see are gold plated or else
nickel... not many hamshacks are awash in SMA jacks, unless ur doing UHF and low power... or going
board to board with some sort of homebrew...
I'll take a look for BNCs from one of the other specialty mfrs... see if they make
SS ones or not.
_-_-
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Maybe these will help.
Here's the 7721A manual.
http://kenrockwell.com/audio/panasonic/images/vp-7721a/vp-7721a-manual.pdf
Here's the 7723A manual.
PANASONIC VP-7723A AUDIO ANALYZER SM Service Manual free download, schematics, eeprom, repair info for electronics
Here's a manual on ebay for the 725B.
Operating Manual with Schematics for Shibasoku 725B JPEG in CDR | eBay
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Who cares about what Hams use or need? I don't
You can get what I think is best for audio in BNC and other styles which have gold plated contacts. No oxidation at contact points.
I would go for the hard gold of suitable thickness, as i have said before. And, yes you can get gold BNC as well. But you can also get gold BNC with 2 signal contacts and use shell for shield (twisted pair wires) only.
I would like to see ALL high-End use BNC only and not RCA. Let the RCA be a legacy input only on Hi-End gear. BNC cables can also be bought for a reasonable price pre=made from many non-audio sources.
THx-RNMarsh
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Nice. Thanks BUT each of these are significantly different from the model(s) i need.
I have already looked at them.
THx-RNMarsh
Some used test equipment companies will send or sell you a manual copy if they have it.
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Okay, I think history has shown that sometimes theorists have been overconfident and later disproven, and in other cases people claim to perceive things that later actually turn out to be artifacts of how brains process sensory information. The latter occurs far more frequently than the former, and by many orders of magnitude. By the odds, there is a small chance you may be onto something. I still want to know if you can demonstrate a good scientific experiment where someone can be shown to hear the effect with good statistical reliability. Doesn't have to be perfect. If so, great. If not, it's probably not worth worrying about for equipment design purposes.
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