WTF is this? Solved Cavity Magnetron - Page 1
Forum section: electronics / projects

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: November 01, 2016, 02:15:26 am
content: Found in with a pile of home made magnetics.Seems to have some HV capability.Maybe an old surge suppressor?HV transformer for sensing?Early flux capacitor?the thing in the middle is a fine wire spring with one end broken.At one end is a glass tube with a steel ball or bearing. It rotates but nothing seems to rotate with it.

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: November 01, 2016, 02:18:02 am
content: more pics

author: NiHaoMike
author_rank: Super Contributor
timestamp: November 01, 2016, 02:20:53 am
content: Looks like a really old magnetron.

author: DTJ
author_rank: Super Contributor
timestamp: November 01, 2016, 02:28:39 am
content: That needs to be polished and stuck in the mantelpiece for viewing pleasure.

author: Someone
author_rank: Super Contributor
timestamp: November 01, 2016, 02:29:11 am
content: The ball on a stick is a coupling to the working waveguide/cavity, and there should be some matching magnets for it to function. Its certainly a magnetron, the "wire spring" is the thermionic element.

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: November 01, 2016, 02:44:18 am
content: How awesome!dont worry It will be looked after.It's not mine but I'm quite pleased I found it. It was just on a shelf of really rubbish hand wound magnetics.I am very interested in WWII flight and early electronics but have never been able to wrap my head around much microwave stuff.

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: November 01, 2016, 02:48:11 am
content: Quote from: Someone on November 01, 2016, 02:29:11 amAny photos of them?I threw two garbage bins full of what I considered junk into a nearly full skip. It hasn't been picked up yet.Ithink? I would have noticed them.

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: November 01, 2016, 03:04:18 am
content: Any idea how to date this thing or find out what type of radar it would be used in?It looks likehttp://www.r-type.org/exhib/aaa0939.htmwhich is from the 1940sbut the pdf says 1961.http://www.r-type.org/static/pdflogo.gif

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: November 01, 2016, 03:49:03 am
content: Probably unrelated but found nearby.Something inside rattles a bit when moved.

author: TiN
author_rank: Super Contributor
timestamp: November 01, 2016, 04:39:05 am
content: Looks like ugly peltier liquid cooled heat-exchanger block, if those wires are for TEC

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: November 01, 2016, 04:59:56 am
content: From what I can gather it was probably used in British Navy Type 277 radar at 2.997 GHz.If this is the case then sometime after 1943.https://en.wikipedia.org/wiki/List_of_World_War_II_British_naval_radar#Type_277also used by the RAFQuotehttp://vc.airvectors.net/ttwiz_03.html

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: November 01, 2016, 05:37:15 am
content: The portable AA twigged a memory.

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: November 01, 2016, 05:41:13 am
content: Sorry about the quality. I think the Cavity Magnetron is from this device.Predictor A.A. No. 3 Mk IIIt has been disassembled and left, unfortunately. I have no idea how to put together so many cogs.http://www.ww2f.com/truxmodels.co.uk/page40.htmlas it mentions aQuoteCouldn't find any magnets though.Sorry about image quality as it is dark in there.

author: LukeW
author_rank: Frequent Contributor
timestamp: November 03, 2016, 05:13:04 am
content: That's beautiful.Seems quite old. During WW2 it was one of the most closely guarded secrets in the world, up there with machine cryptology and the atomic bomb.