You could have some shavings left over from the machining process in the bolt holes. The best way to check is to run a tap of the appropriate size down the hole and clean out any leftovers. You will
Yep! Here in the desert, flying grit and sand is a real problem. Check out these pictures of the local weather: http://www.navair.navy.mil/nawcwd/weather/chinalake/web/pics/gallery/GF67.jpg http://ww
The numbers you get seem about right. For the DE, the 7.6 amps implies a feedpoint resistance of about 26 ohms. Which is reasonable for a yagi. The other element currents seem about right too. Since
Actually a good example of this is the inverted vee. Where you deliberately add a lot of sag :-) This tends to lower the feed point impedance of the antenna. One thing to realize is that the resonant
What I suspected here was that when the wire antenna was put up, sag was minimal. Then it began to droop further as time went by. This is due to the wire lengthening under load. I experienced this a
I bought a tri-bander used from a silent key's estate. His wife did not have any documentation for the antenna. Given the state of the antenna and the tower that I got with it, it was probably put up
Thanks to the list for such a prompt answer. After downloading the manual, it indeed does appear to be an ATB-34. Now I just have to refurbish the traps, replace some lost hardware and get the tower
So how hot do you have to get the owl to solder it to a PL-259? Inquiring minds want to know! 73, Erich N6FD _______________________________________________ __________________________________________
Trees are absorbtive, metal is reflective. At least with the metal, your signal goes somewhere. _______________________________________________ _______________________________________________ TowerTa
Eddy, Think about the metal as being part of an antenna system. A yagi has the reflector often shorted to the boom and driven element. The metal reflects or redirects the signal with minor losses. Th
Eddy, My answer to question #1 is that the wood in a building is usually dry. Dry lumber has much lower losses than wet lumber. Additionally, it only has to go through 3/4" to 6" of wood to get out a
Try 4nec2 it is free, reasonably easy to use and reasonably accurate. I'm not sure exactly how you are set up there, but you should be able to model your antenna system. Jamaca NVIS... - four driven
4nec2 is a useful NEC modelling tool. It has a fairly simple user interface and nice output graphics. Best of all it is free! Erich N6FD On 1/26/2013 11:55 AM, K0DAN wrote: Is there someone on the li
My best guess is that it is camouflage support mast. The military has used a variety of materials from fiberglass to aluminum to make the supports. Usually they went no more than 3 sections high. 73,
I have used the 4nec2 program with good results modeling my VHF stack. Its interface is quite good and the price is free. Its also pretty good for modeling HF antennas although you may have to play w