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Test Equipment Anonymous (TEA) group therapy thread

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TERRA Operative:
Looks like the forum image bug is biting again.

Flare, when you post images, ignore the first slot and start uploading your images from the second slot. There's a bug in the forum software that messes up the images if you use the first upload slot. :)

THDplusN_bad:

--- Quote from: Vince on March 25, 2023, 11:08:03 pm ---Switch Question :

I took apart that old TE below, a strange kind of RF gen., from the (60's looks like, though it's solid state inside somehow.

I salvaged all the switches from output step attenuator.

They look like beefy things, that would normally switch big mains loads but... since they are used to switch delicate RF signal, I fear they must be specialized in conveying RF signals, and are not capable, despite they big size, of safely switching mains with a high current ? 

There is no part number on them so I can't pull a datasheet for them. Only marking on them is at the back, it reads " KAY " , which appears to be the name of the manufacturer of that TE, if I believe the front panel of the instrument, located in Pine Brook New Jersey, US of A.

--- End quote ---

Wow, that's quite a beefy unit from a specialized company. Some information about the "Kay Electric company" can be found here:
http://waywiser.fas.harvard.edu/people/8990/kay-electric-company
The switches in the unit's step attenuator assembly are special as they have a special substrate. They also switch a resistor network as visible from your photos - but as the generator's max. frequency was 120 MHz and most likely the flatness specs for its output signal were not very good, the large geometries did not hurt back then. At least, that's my theory to it... :-//

Cheers,

THDplusN_bad

Flare:

--- Quote from: TERRA Operative on March 26, 2023, 12:46:31 pm ---Looks like the forum image bug is biting again.

Flare, when you post images, ignore the first slot and start uploading your images from the second slot. There's a bug in the forum software that messes up the images if you use the first upload slot. :)

--- End quote ---
Thanks, I was questioning my sanity.

factory:

--- Quote from: URI on March 26, 2023, 09:02:39 am ---After I was announced this:


I got an email today announcing the delivery of my hp 5370B time interval counter to me today!  :o

...snip...

Full story here.

--- End quote ---

Shame the pictures & more than half the forum are hidden for non members :-- and no I don't want to join another forum, don't have enough time to contribute to three I use.

David

Edit: Apologies to anyone that misunderstood this post, it was a general comment about the TEA forum and not aimed at anyone.

Robert763:

--- Quote from: Vince on March 25, 2023, 11:08:03 pm ---Switch Question :

I took apart that old TE below, a strange kind of RF gen., from the (60's looks like, though it's solid state inside somehow.

I salvaged all the switches from output step attenuator.

They look like beefy things, that would normally switch big mains loads but... since they are used to switch delicate RF signal, I fear they must be specialized in conveying RF signals, and are not capable, despite they big size, of safely switching mains with a high current ? 

There is no part number on them so I can't pull a datasheet for them. Only marking on them is at the back, it reads " KAY " , which appears to be the name of the manufacturer of that TE, if I believe the front panel of the instrument, located in Pine Brook New Jersey, US of A.

--- End quote ---

Oh Vince,
Why did you do that? Those switches, resistors and housing made a very nice switched RF atttenuator and you broke it up  :palm:
Ok you might have had to cut out the section of front panel but it would have been worth it.
The generatoe was good for CW as wel as pulse. What coverage did it have? VHF at least but it looked multiband.

No, the switches are no good for power, just low level signals and RF. I looks like KAY bought standard tpggle mechanisms and put their own RF contacts and insulators on the back. You will have to check but they may ground a terminal to the bush in one position.

Robert.

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