Variable Capacitor Sealed In Oil

[Yavin101]

I came across this variable cap at a junk sale, and was wondering if anyone had any info about it. I put a meter on it and got a reading of (30pf -> 800pf) @ 1kHz)  I cannot find anything about it on Internet searches (except for a eBay listing with no information,)  just looking for any type of datasheet or information about its original uses.  Thank you

[xwarp]

Looks military grade. Post about this here and I'll bet you get an answer:

http://www.antiqueradios.com/forums/viewforum.php?f=5&sid=6cc28cf95602f7737ca73d2cf8a67881

[TheSteve]

I have no info to share but do think it's very very cool. I wonder what the break down voltage is with the oil.

[Yavin101]

The info I received from antiqueradios.com/forums is that its WWII surplus equipment.


http://antiqueradios.com/forums/viewtopic.php?f=19&t=332790&p=2786256#p2786256

[Cyberdragon]

It's probably a transmitter tuning capacitor. It's used in the output section of a high power amplifier to either tune the output or the antenna. I've never seen a clear one like that though.

[Yavin101]

I used it to tune a homebrew long wire antenna. the wire is 256' with a coil. it works well on 80 and 40 meters. SWR of 1.1 at 7.189 MHz and 1.3 on 3.968 MHz. I still plan on building a magnetic loop antenna for 40 and 20 meters.