A co-worker asked me today why hams use horizontally polarized yagi's instead of vertically polarized. Am I correct that it has to do with ground reflection gain? ____________________________________
That's one good reason. I think we'd do it anyway because it's so much easier to put the antenna perpendicular to the tower and have everything work right. There are mechanical and electrical interac
That's one good reason for it. Another is that in the case of only one yagi, mounting it vertically puts all the elements in line with the tower/mast, potentially causing unwanted electrical interact
Vertically polarized antennas are used at lower frequencies where you would need very high, huge masts for supporting horizontally polarised antennas. Most of ShortWave antennas (commercial services)
if they were for different bands, one could conceivably interleave them (as is done for a variety of commercial antennas), although the interactions would probably necessitate some redesign. If you w
Presumably, the question stems from other mobile radio services where vertical antennas are the norm. The Part 95 27 MHz service also settled onto vertical antennas as that is easiest to achieve on t
We shouldn't assume that just because an antenna is horizontal it produces only horizontally-polarized radiation. Take a look at a horizontal half-wave dipole with a modelling programme and you'll fi
I have been using EZNEC for some time but I am not aware that EZNEC actually indicates if the radiation is horizontal or vertical. I probably haven't read the manual enough. Please steer me on to it?
In the main window, click on "Desc Options" and you can get it to plot Vertical and Horizontal separately, with or without the "total" field. I also have options for circular polarization but I think
Al, Main EZNEC window, click on Desc Options at the bottom. Select the "Vert, Horiz, Total" option in the "Fields" Tab. Then try some FF Plots. It's an eye opener! 73, Steve G3TXQ ___________________
All these answers and not one mentioned that on low bands, at least the QRN is predominately vertically polarized and using a horizontally polarized antenna means listening to less QRN although at ti
If memory serves me well -- that is simply a vertical or horizontal cut through the plot 3D plot. It is not the polarization of the field. 73 -- Larry -- W1DYJ _______________________________________
I've always thought this as well, but others have claimed this is not true. Can anyone explain why this is the case? Yes, my anecdotal evidence supports this. I've done side-by-side comparisons of a
OK, let's ignore the fact that I said "horizontally polarized". My co-worker assumed my antenna is "horizontally polarized" because it is physically oriented that way. Regardless, I'm sure everyone u
I think that the noise isn't actually polarized.. It's more a matter of the fine details of the antenna pattern for noise sources that are physically close to your antenna. I'll see if I can find the
Is the physical distance from the interference source different for the two antennas? (assuming you're not talking thunderstorm noise, which is randomly polarized) For close distances, small absolute
And that's exactly it... for low takeoff angles, a horizontally polarized antenna is almost always better than a vertical of the same physical size at the same height above ground. WHen it comes to l
That's easy. Ground waves are always vertically polarized. Thus if the noise is from a ground based source, and starts out with both polarizations, only the vertical polarization survives any signifi
What sort of distances are we talking about here (where the ground wave hpol dies out).. 10s of meters, 100s of meters, kms? I would assume that "at the source" the noise is essentially randomly pola
Horizontal dipoles have nulls in the azimuth plane verticals don?t have 73 Peter --Original Message-- From: towertalk-bounces@contesting.com [mailto:towertalk-bounces@contesting.com] On Behalf Of Kel