Home |
Search |
Today's Posts |
#21
![]() |
|||
|
|||
![]()
Frnak McKenney wrote:
If I'm following the ARRL handbook correctly, I want the elements laid out _across_ the incoming wavefront. For Fort Collins to Richmond, that is, going west to east, that would mean I'd want to string the wires/elements north-south. Naturally (per Murphy, the patron saint of Data Processing) my house is oriented E-W. Which does still, as you point out, leave the possibility of building something outdoors. You're following it correctly only if you're using elements which are no longer than about 5/4 wavelength. The direction of maximum gain isn't longer perpendicular to the wire if the wire is longer. This is covered very will in the _Antenna Book_. Still, my current indoor loop seems to be picking up a nice strong signal. It was upright when I first started testing, but it wound up being laid flat at some point in the past few days -- about the time I discovered that I had been mis-tuining it. Wonder which had more effect: my changes, or atmospherics? grin! As I mentioned in my other recent posting, there's no way for you to tell. Anyway, thank you for your time and suggestions. I did some looking around on the 'web for introductory material to help me understand the ARRL Antenna Handbook and stumbled onto these: Antenna Newcomers and the Language of Antennas http://www.cebik.com/tales/nc.html Antennas from the Ground Up http://www.cebik.com/gup/groundup.html Some really nice propagation plots. Now, if there were just some simple way of figuring out which way the antenna is oriented relative to the plots... "It's an imperfect universe" grin! You can duplicate the plots for the kinds of simple antennas you're dealing with, with the free demo version of EZNEC available from http://eznec.com. In the View Antenna display, select View/Objects, then check the "2D Display" box. Then you'll see a 2D plot superimposed on the view of the antenna, to show how the two are related. When viewing a 3D plot, the View Antenna display rotates along with the 3D pattern, so you can see how they're related if you keep both windows open. Roy Lewallen, W7EL |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
What antenna for receiving video signal from ISS ? | Antenna | |||
Need some help designing a receiving antenna | Antenna | |||
Best Antenna for Receiving - NEWBIE | Antenna | |||
Readily available 10MHz divide by 96 10MHz down counter | Homebrew | |||
Readily available 10MHz divide by 96 10MHz down counter | Homebrew |