The AM Forum
March 29, 2024, 03:26:12 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: ham estate mystery item  (Read 4402 times)
0 Members and 1 Guest are viewing this topic.
Opcom
Patrick J. / KD5OEI
Contributing
Member
*
Offline Offline

Posts: 8308



WWW
« on: April 08, 2023, 11:12:01 PM »

This ham had many, many interesting things. Here is something new to me for sure. These were in an organizing bin with a couple of CL-5M5 photocells. -which seem like regular type photocells/photoresistors and not really related to the parts in question.

These are about 1.2" diameter, and have 4 short pins out what I presume is the backside. The other side is slightly domed in appearance. Inside these, there seems to be a liquid, somewhat viscous, and dark-colored like motor oil or light molasses. I can't see where the pins go. As the device is rotated like a wheel, the liquid is free to stay in the lower half.

The number on all of them is 74821 -01
Any ideas what these are?


* IMG_20230408_172407784c.jpg (259.86 KB, 900x749 - viewed 292 times.)
Logged

Radio Candelstein - Flagship Station of the NRK Radio Network.
W1RKW
Contributing
Member
*
Offline Offline

Posts: 4410



« Reply #1 on: April 09, 2023, 08:30:51 AM »

up/down position sensor?
Logged

Bob
W1RKW
Home of GORT. A buddy of mine named the 813 rig GORT.
His fear was when I turned it on for the first time life on earth would come to a stand still.
W3SLK
Member

Offline Offline

Posts: 2651

Just another member member.


« Reply #2 on: April 09, 2023, 08:41:37 AM »

W1RKW said:
Quote
up/down position sensor?

I was going to say something like a mercoid switch.
Logged

Mike(y)/W3SLK
Invisible airwaves crackle with life, bright antenna bristle with the energy. Emotional feedback, on timeless wavelength, bearing a gift beyond lights, almost free.... Spirit of Radio/Rush
KD1SH
Member

Offline Offline

Posts: 738



« Reply #3 on: April 09, 2023, 10:15:54 AM »

Curious - have you tried taking resistance readings across the contacts, and if so, do they change at all with a change in physical orientation?
And, just a shot-in-the-dark: since these mystery devices were in a bin with photocells, and they have a transparent cover, do you think they might actually be photo-sensitive?
I would actually have expected the contact pins to be on the other side if that were the case, but it's just a thought.
Logged

"Gosh, Batman, I never knew there were no punctuation marks in alphabet soup!"
—Robin, in the 1960's Batman TV series.
wa2tak
Member

Offline Offline

Posts: 110


« Reply #4 on: April 09, 2023, 04:09:27 PM »

Might it be a lightning surge protector...

https://www.cheapham.com/ldg-sp-200-lightning-surge-protector-replacement-gdt/
Logged
K8DI
Contributing
Member
*
Offline Offline

Posts: 423


« Reply #5 on: April 10, 2023, 07:27:46 AM »

Those are much smaller than the 1.2” diameter OP listed. 
https://www.littelfuse.com/~/media/electronics/datasheets/gas_discharge_tubes/littelfuse_gdt_cg_cg2_datasheet.pdf.pdf

My guess is some form of position sensor.  Does the bit inside that looks metallic move?

Ed
Logged

Ed, K8DI, warming the air with RF, and working on lighting the shack with thoriated tungsten and mercury vapor...
Opcom
Patrick J. / KD5OEI
Contributing
Member
*
Offline Offline

Posts: 8308



WWW
« Reply #6 on: April 14, 2023, 09:14:54 PM »

Only the liquid moves and there does not seem to be anything else inside. It is probably not a pellet type surge suppressor at least not the composite disc or pellet type. I did not check resistance, but will do next time I am there. I wonder if it could be automotive as the gentleman did a lot of work on his own cars, but this was in an otherwise electronics bin organizer.
Logged

Radio Candelstein - Flagship Station of the NRK Radio Network.
WBear2GCR
Member

Offline Offline

Posts: 4135


Brrrr- it's cold in the shack! Fire up the BIG RIG


WWW
« Reply #7 on: April 23, 2023, 09:42:03 AM »


I believe that is a rare "fitzwaddit"... an integral, but poorly understood and quantum operating device used primarily in the Flux Capacitor assembly, as first found in Roswell...
Logged

_-_- bear WB2GCR                   http://www.bearlabs.com
KD6VXI
Contributing
Member
*
Offline Offline

Posts: 2648


Making AM GREAT Again!


« Reply #8 on: April 23, 2023, 04:27:40 PM »

My grandfather referred to such things as dingwatchits, gizzyflobs and other such terms.

Genuine West Texas frontier jibberish.


--Shane
WP2ASS / ex KD6VXI
Logged
Opcom
Patrick J. / KD5OEI
Contributing
Member
*
Offline Offline

Posts: 8308



WWW
« Reply #9 on: April 24, 2023, 01:54:16 AM »

A Dallas TX mechanic years ago called odd looking things: 'that Hooter-McGruder deal'.
Logged

Radio Candelstein - Flagship Station of the NRK Radio Network.
Jim/WA2MER
Contributing
Member
*
Offline Offline

Posts: 298



« Reply #10 on: April 24, 2023, 06:57:49 AM »

Those are framistats. Their sole purpose is to cause a bunch of old guys to go on about them for days on end. Apparently those are still in good working order.  Grin
Logged

Anything worth doing is worth doing to excess.
Since you have to die anyway, you might as well die from something you like.
KD6VXI
Contributing
Member
*
Offline Offline

Posts: 2648


Making AM GREAT Again!


« Reply #11 on: April 25, 2023, 05:46:59 AM »

Lol.  That reminds me of more West Texas Jibberish.

Grandpa, what's this?  I ask, pointing at something under the hood of the car.

Grandpa, "That's designed to make little boys ask questions.   Works, don't it!".

Of course, he would give me the full rundown after he got his five chuckles in.

--Shane
WP2ASS / ex KD6VXI
Logged
RolandSWL
Contributing
Member
*
Offline Offline

Posts: 253


« Reply #12 on: April 26, 2023, 08:59:57 AM »

No. Sorry. Framistats had a left hand thread. This is a sub assembly from a Shpitzen-shparken suppressor.
Logged
W7TFO
WTF-OVER in 7 land Dennis
Contributing
Member
*
Offline Offline

Posts: 2521


IN A TRIODE NO ONE CAN HEAR YOUR SCREEN


WWW
« Reply #13 on: April 26, 2023, 11:22:30 AM »

Alien technology.
Logged

Just pacing the Farady cage...
KD6VXI
Contributing
Member
*
Offline Offline

Posts: 2648


Making AM GREAT Again!


« Reply #14 on: April 26, 2023, 11:47:09 AM »

OK, I did find out what it is, all BS aside.


It's a one of those.


--Shane
WP2ASS / ex KD6VXI
Logged
Opcom
Patrick J. / KD5OEI
Contributing
Member
*
Offline Offline

Posts: 8308



WWW
« Reply #15 on: May 01, 2023, 12:12:18 AM »

up/down position sensor?

We have a winner!

The mysterious fluid is conductive. When it is touching two pin elements, the resistance between them is about 1-2K Ohms. When it is not touching, the resistance is much higher, about 20-30K. Perhaps that high resistance is a residual conduction from a very small amount of the fluid coating ther inside. Perhaps the conductive fluid is an alternative to mercury.

If the device were mounted on a slowly rotating hub, it could be used to detect approximate relative phase and the direction of rotation. I did not have enough fingers to try to see what happens when three terminals touch the fluid.
Logged

Radio Candelstein - Flagship Station of the NRK Radio Network.
DMOD
AC0OB - A Place where Thermionic Emitters Rule!
Contributing
Member
*
Offline Offline

Posts: 1768


« Reply #16 on: May 01, 2023, 12:48:57 AM »

up/down position sensor?

We have a winner!

The mysterious fluid is conductive. When it is touching two pin elements, the resistance between them is about 1-2K Ohms. When it is not touching, the resistance is much higher, about 20-30K. Perhaps that high resistance is a residual conduction from a very small amount of the fluid coating ther inside. Perhaps the conductive fluid is an alternative to mercury.

If the device were mounted on a slowly rotating hub, it could be used to detect approximate relative phase and the direction of rotation. I did not have enough fingers to try to see what happens when three terminals touch the fluid.


OK, it's so a 4-pole Shpitzen-shparken position sensor. Grin
Logged

Charlie Eppes: Dad would be so happy if we married a doctor.
Don Eppes: Yeah, well, Dad would be happy if I married someone with a pulse.NUMB3RS   Smiley
Opcom
Patrick J. / KD5OEI
Contributing
Member
*
Offline Offline

Posts: 8308



WWW
« Reply #17 on: May 03, 2023, 01:42:37 AM »

up/down position sensor?

We have a winner!

The mysterious fluid is conductive. When it is touching two pin elements, the resistance between them is about 1-2K Ohms. When it is not touching, the resistance is much higher, about 20-30K. Perhaps that high resistance is a residual conduction from a very small amount of the fluid coating ther inside. Perhaps the conductive fluid is an alternative to mercury.

If the device were mounted on a slowly rotating hub, it could be used to detect approximate relative phase and the direction of rotation. I did not have enough fingers to try to see what happens when three terminals touch the fluid.


OK, it's so a 4-pole Shpitzen-shparken position sensor. Grin

And so it shall be advertised in that manner at the upcoming vintage ham/maker/science components 'estate sale'.
Logged

Radio Candelstein - Flagship Station of the NRK Radio Network.
RolandSWL
Contributing
Member
*
Offline Offline

Posts: 253


« Reply #18 on: May 04, 2023, 12:58:20 PM »

O.K., But you must include the product safety warning with it:
ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENSPEEPERS!
DAS RFMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN.

Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.082 seconds with 19 queries.