[Milsurplus] puzzler - module with glass rod?

[Ray Fantini]

Never in the field of military radio collecting have  so many speculated so much on so small an item.

Just because everyone else is speculating let me throw in my opinion. I do not think it’s a filter or anything like that. One question I would have is if you have access to a grid dip meter and can check the resonance of the tuned circuts on the chassis. That would be most informative. Looking at the size and shape of the glass part don’t think it’s used as an oscillator or filter and more inclined to think that it may be used as a component in some sort of short duration pulse detector.
I have seen similar items used to protect high power klystrons in transient protection circuts know as crowbars that detect short duration pulses and shut down the tube before damage can occur.
Back in the days of high powered UHF analog TV it was common to use Klystrons or later IOT tubes in the 5 to 30 Kw power level and would assume that tubes used in ground radar applications would have similar protection.

Ray F/KA3EKH

From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Nick England
Sent: Wednesday, April 06, 2016 5:39 AM
To: KD7JYK DM09
Cc: Military Surplus Mail List
Subject: Re: [Milsurplus] puzzler - module with glass rod?

The ceramic disc at the base of the rod has a single silvered contact to the center while the rim is grounded. This assembly appears silver-soldered or tightly attached to the rod somehow. Measures infinite ohms between the two disc contacts. The spring at the top just presses on the polished face of the glass rod and there's no silvered surface or anything to indicate it is meant as an electrical contact.

So there is only the single wire connection plus ground, both at the base.

On Tuesday, April 5, 2016, KD7JYK DM09 <kd7jyk at earthlink.net<mailto:kd7jyk at earthlink.net>> wrote:
"Then there is the issue of only one connection to the rest of the module so
there is only an input to Z1 and no output."

Looked to me like some sort of connection at the center bottom and another,
the spring to the metal can to the chassis.

Kurt



--
Nick England K4NYW
www.navy-radio.com<http://www.navy-radio.com>

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