Post B3pxjD7YaRelY37Lc0 by NotYourSysadmin@infosec.exchange
(DIR) More posts by NotYourSysadmin@infosec.exchange
(DIR) Post #B3phu1f9vg2LvkyC6y by foone@digipres.club
2026-03-02T02:31:02Z
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Hey Electronics Nerds, I have an Unknown Object here:Multiple identical aluminum tubes, with BNC connectors on one end, and they're numbered.My guesses are... Big resistors or RF Magic?
(DIR) Post #B3piJy3XxezSH2kNN2 by BustaMarx@corteximplant.com
2026-03-02T02:35:43Z
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@foone They look at first pass like duplexers of some kind, the screw adjusters next to the coax connections look like cavity tuners.
(DIR) Post #B3piMXUJCLs8k5UUeu by rakslice@mastodon.social
2026-03-02T02:35:44Z
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@foone rf magic, like tunable filters that are just a mechanical thing you tune by turning the screw and it moves a thing up and down the tube there
(DIR) Post #B3piTqJfapWjAGztT6 by huwr@aus.social
2026-03-02T02:37:34Z
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@foone calibration things?
(DIR) Post #B3piXr2aqCooZPvGvA by Da_Gut@dice.camp
2026-03-02T02:38:19Z
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@foone are the actual BNC connectors or do they have open passages into the block? If it’s the latter, they could be cooling heat sinks, which sometimes look like that.
(DIR) Post #B3pifB3KprAefBlH6m by nothacking@infosec.exchange
2026-03-02T02:39:37Z
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@foone (Gamma) Scintillation detectors! It'll have a big photomultiplier tube inside, which needs around a thousand volts at basically no current, which is detecting very dim light flashes produced by a crystal in response to radiation.
(DIR) Post #B3pinqxauOFUxBDHqy by Darius@mastodon.cloud
2026-03-02T02:41:11Z
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@foone I would guess RF magic - BNC can't carry that much power. Do you have a NanoVNA or something to connect to them?
(DIR) Post #B3pl4M84zRYmAG7A5Q by tadbithuman@mastodon.social
2026-03-02T03:06:34Z
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@foone heat exchanger tubes?
(DIR) Post #B3po7QCebGE5WwPKdc by AinsleyLowbeer@mastodon.social
2026-03-02T03:40:39Z
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@foone That's the core of Trump's Discombobulator. Beware!
(DIR) Post #B3pp9aCAWJUp3Om7AO by kranzi@mastodon.green
2026-03-02T03:52:17Z
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@foone maybe just terminators, you need dummy-loads for all kind of high power rf applications
(DIR) Post #B3pxjD7YaRelY37Lc0 by NotYourSysadmin@infosec.exchange
2026-03-02T05:28:25Z
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@foone @HopelessDemigod Might you have any insight, if it's perhaps RF-related?
(DIR) Post #B3q6lLJhz6998NtQ0W by SharpLimefox@eldritch.cafe
2026-03-02T07:09:37Z
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@foone i would join the crowd in favor of RF nonsense because of the BNC connectors. As to whether they're dummy loads (less likely, you'd have one connector each) or impedance tuners or even filters, shrug
(DIR) Post #B3qN7XQxDI8cLqt5EW by BigTittyBimbo@autonomous.zone
2026-03-02T09:17:02Z
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@foone RF filters
(DIR) Post #B3qUEfC3Sd6y7kGN8q by Cadbury_Moose@wandering.shop
2026-03-02T11:32:38Z
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@foone Tunable cavity filters would be my guess. The screw with the locking collar alters the plunger position within the cavity and the collar locks it in position once it's set to the desired frequency. (The fact that they all have the same part numbers and then a larger 4-digit number on side and end is another hint - it may be the channel or frequency so you know which one to adjust when setting it up.) Some sort of resonant cavity, anyway. 3:O)>
(DIR) Post #B3rAGCBYTljeoLRUeW by SvenGeier@mathstodon.xyz
2026-03-02T19:23:29Z
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@fooneAs a hardware person, I'd like to add 2 things nobody has mentioned yet: 1) where do these come from? Wouldn't that give us a clue what they are? And2) they're obviously not monolithic. This means they can be opened and their innards examined and photographed...