hitting with so much force Weigh your tube, calculate it's kinetic energy 0.5 * mass * velocity ^2 right before impact and comparing that to the muzzle energy of a bullet. I think the kinetic energy
Keith, I don't know guns, I just know kinetic energy. What if the bullet didn't mushroom at all? You think it'd go in a foot then? Dan _______________________________________________ _______________
Guys, I don't want to try to throw cold water on the thread, but K2VI, do you think your local authorities will give you a building permit (or that you need one) for a 40 foot wooden lookout tower ty
the common mode currents? Twisted pair through a toroid. _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.c
No, cancellation is cancellation. _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contest
losses are sufficient that the magnetic circuit isn't very close to ideal. Well that particular case was just talking about how it's a bad idea to wind your common mode choke using widely seperated
When you start talking about 12 foot high vertical dipoles, you really need to revisit your assumption of a lossless matching network. With big, fantastic loading coils at the center with Q=500 , a
to better isolate the driver chips from getting nailed so easily? Well, you need to build something that can source as much current as the driver chips. Wonder what happens if you replace each outpu
In the end, if you don't get any responses, remember: You can't break garbage. 73 Dan _______________________________________________ _______________________________________________ TowerTalk mailing
You have to be a little careful too, even if it "appears" to be self locking. The mechanism that disallows back-driving is ultimately that the static friction becomes stronger and stronger under loa
Mostly I think they use a pair of coupled mag-loops. They can be a couple loop diameters apart and still achieve 50-70% efficiency. You can model the effect in EZNEC. Build a couple identical resona
They look like PVC junction boxes to me. The onese I have are made by Carlon and came from Home Depot: http://www.carlon.com/Master%20Catalog/Junction_Boxes_Brochure.pdf http://n3ox.net/projects/ste
And if it binds just enough, you might not notice in the sense that the rotor will still turn, but you'll end up putting nasty lateral loads on everything simply by virtue of shaft misalignment. I w
Re: UV When you install them, rough 'em up a bit with sandpaper, spray on a couple coats of RustOleum plastic paint and they last well. This was out in the elements for a little over two years and th
Whether it's complicated and un-necessary is really a matter of opinion. Granted, the mismatch loss is insignificant, and if you have an autotuner or manually tuned amp that you use all the time any
The 1.5:1 SWR circle for lossless 75 ohm line intersects the real axis at 50 ohms and 112.5 ohms resistive. 112.5 ohms resistive is 2.25:1 50 ohm SWR when you transition back to a 50 ohm system ____
What I meant was the mismatch WITH a 75 ohm line, not "on" The 75 ohm line can transform a 50 ohm load up to as bad as a 2.25:1 mismatch w.r.t. 50 ohms. ______________________________________________
Yeah, but 1/2 inch hardline might as well be lossless, and if the load is 40 ohms or 36 ohms instead (no problem on a 50 ohm system), then the range of unacceptable matches from the transformation e
Yeah, for the "worst case" 2.25:1 SWR with an actual ohm load. But it's a warning about the casual use of 75 ohm cable in 50 ohm systems based on an experience I had when I didn't even know the cable
" I didn't even know the cable I had was 50 ohms wasn't 50 ohms... .oops _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTa