From: "Terrell W. Fritz"
Date: Thu, 21 Mar 2002 13:30:57 -0700
Subject: Re: [TSSP] short H/D and stuff
Hi Paul, At 07:49 PM 3/21/2002 +0000, you wrote: >Terry wrote: >> http://hot-streamer.com/temp/P3200029.JPG > >That's looking very good. A very neat coil. Are you winding by hand >or do you have a machine? Just by hand. It goes pretty easy and fast really compared to figuring out a machine. Connecting the pins is what takes the time. When I get it done, I'll measure it all out and such. > >Without modeling this coil in detail, we can say roughly that for >h/d=1, the current maximum will be around 30% of the way in from >the grounded end, and at that point the current will be roughly 20% >higher than the base current (the exact values will depend a little >on the coil's height above the ground plane). Therefore, if you >can achieve 1% accuracy on the measurements, the results should be >very clear indeed. Should it be tested on a split foil ground plane? Do you have any idea of what resistor value should be used? > >If you can 'ping' the coil with a base voltage pulse and grab the >Ibase waveform, that'll give me the mode spectrum - much better >than sweeping with a sig gen! I suspect that there should be enough >info in those ping waveforms for me to calculate the current profile >without knowing the coil's dimensions! But I haven't worked out >how to do that yet (: I am working on a nice pinger for the Q experiment. Your FFTs of the base current you sent to the Tesla list looked really great! That seems to be a great way to measure all these parameters in a single flash. I might as well make an "official" tester to do that. I guess those pinger things need some kind of name... Cheers, Terry >-- >Paul Nicholson, >--
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.