Am 30.11.20 um 07:00 schrieb Mark Sims:
I once bought a spool of tungsten-rhenium alloy wire on ebay for dirt cheap. A few weeks later a guy contacted me and offered a lot of money for it. Turns out they used it to rebuild TWTs.
1. I used to live in Ulm, Germany, where there was? Thales TWT production. My neighbor and fellow ham worked there, so I got an invitation for their family-open-house day. That was most interesting. One division looked so much like a mechanical craft shop: glass blowing, milling, electrical discharge machining, welding, all so ...retro. And then, the next room: An array of the best and newest vector network analyzers, with ladies moving magnets to collimate the beam and maximizing S21. But I don't think they can survive the GaN revolution. 2. @ Jim: Is there a canonical way to couple a varactor etc to the DRO for locking without killing Q or without having any effect? I have made some experiments with 3D-electromagnetics but did not get very far. It's not for the casual user. Mechanical vibration is probably not an issue for our electron spin DRO. :-) It weighs more than 3 Kg, most of it iron to support the DC field magnets. Looks good. I'd like to get one for the mantlepiece. Our puck has a borehole for a tiny glass pipe through it to apply the solution with the free radicals. Q takes a hit but there is still enough left. We get quite a frequency shift when changing the uMol concentration. Can't tell numbers. Cheers, Gerhard _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
