harnessing lightning, or not
in [Design]
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From: Joerg on 14 Jun 2010 19:47 krw(a)att.bizzzzzzzzzzzz wrote: > On Mon, 14 Jun 2010 13:35:13 -0700, Joerg <invalid(a)invalid.invalid> wrote: > >> Paul Keinanen wrote: [...] >>> For this reason a folded dipole is nice, since you can ground the >>> midpoint of the upper (continuous) side. No extra inductors needed. >>> >> I sure wish I could find a 900MHz antenna like that right now. But it >> must be under 4dBi for license reasons and must be a vertical stick >> because of space constraints. > > If you need a source for antennas send me a note. We have a couple of > manufacturers who work pretty closely with us. One has come up with a > solution for 900MHz that even fits where we need it. ;-) > Done, but no rush :-) [...] -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Archimedes' Lever on 16 Jun 2010 13:32 On 12 Jun 2010 13:25:32 -0700, Winfield Hill <Winfield_member(a)newsguy.com> wrote: > So, no, I don't expect the cap to flash over. Bring it on! My node is 150 feet away from any ground point. That is 150 feet of Teflon or Delrin or glass or whatever hat that goes from the charging node to the plate itself. If lightning strokes come down here from up there, it will, during said charging event, flash over from the charging node to ground, until the charging event(stroke) is over. Then, of course, there will be no further arcing, but the point was that one cannot capture the entire potential the stroke is at. One will always only be able to grab SOME of it. So my cap presents a HUGE distance between the node and ground. Yours? How far apart are the nodes that are tied to your cap's plates? Yes, it does matter. My cap will have a final charged voltage far higher than any cap where the distance is smaller, because that distance will determine how much is lost to the flash over during stroke event, which is what I was talking about before as well.
From: Archimedes' Lever on 16 Jun 2010 13:40 On Sun, 13 Jun 2010 17:57:47 -0700, Joerg <invalid(a)invalid.invalid> wrote: >Gear out in the field typically never has that. Cable TV hard line full spectrum line amplifiers hang on a hard line that carries the 60V power supply source that they use to operate. You really do say a lot of things before you think it through.
From: Archimedes' Lever on 16 Jun 2010 13:44 On Sun, 13 Jun 2010 17:57:47 -0700, Joerg <invalid(a)invalid.invalid> wrote: >Of course, if you design sat-gear that's different. I doubt that you know the industry well enough to expound on it in 'industry wide' manner. You do not know enough.
From: Joerg on 16 Jun 2010 16:16
Archimedes' Lever wrote: > On Sun, 13 Jun 2010 17:57:47 -0700, Joerg <invalid(a)invalid.invalid> > wrote: > >> Of course, if you design sat-gear that's different. > > I doubt that you know the industry well enough to expound on it in > 'industry wide' manner. > > You do not know enough. So, what do you know about electronics in agriculture, outdoor equipment control, oil & gas, airport infrastructure, aircraft electronics, spacecraft electronics, and so on? I am talking professional stuff here, not entertainment infrastructure. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |