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Game: Guess the mystery object !

The Lightning Stalker

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It's definitely some type of plasma arc device.
 



Sigurthr

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Aside from the small chamber it almost looks like a PVD source.
 

BowtieGuy

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I think starlight is on the right track, it looks like something that was cast using the "lost foam process". That's probably why it looks so much like foam. :)
 
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Dr_Evil

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Hemlock_Mike

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Dr Evil --- It looks to me like a polishing wheel
for some metals.
HMike

What are we analyzing here?

Air filter ????
 
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douro20

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Here's another one, but this time I have no clue what it is used for. From the circuity inside I believe it's supposed to generate a 5MHz tone.
And before you ask, I don't have an oscilloscope or a working frequency counter.
27764438600_81716cf979_z.jpg
 
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douro20

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If that's a positive column discharge through argon I'm seeing, then I'll take a guess that this is a cold-cathode regulator tube.
 

Benm

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Here's another one, but this time I have no clue what it is used for. From the circuity inside I believe it's supposed to generate a 5MHz tone.
And before you ask, I don't have an oscilloscope or a working frequency counter.
27764438600_81716cf979_z.jpg

It could be just that, though 10 MHz is a fair bit more usual. I suppose there is a power connection somewhere on the other side of the case, but some pics of what's inside could clear it up.

These units have a number of applications. Some have a square wave output so lots of harmonics and are used to create a reference grid of frequencies to help tune radio receivers and such.
 

douro20

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Here is a photograph of the inside. It reminds me very much of a simple crystal oscillator with a single transistor, a few passives and a 5MHz crystal. What it's for I don't know.
27972645311_ea1da9c09c_z.jpg
 

Benm

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Looks like a 5 MHz marker to me, probably 1980s.

Probably not really a frequency reference or timebase since it's just an uncompensated crystal oscillator, but it will help you find 5/10/15/20/25 Mhz on an anlalog receiver.

Strange that there is no 'on' LED in it, though that would probably use more power that the oscillator for leds of the era.
 

LaserCo

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That RS battery is going to be worth something somday?!! Thanks for reviving this thread!
 




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