...think that there's "more to understanding" horizontal and vertical antennas on Top Band. Listening to a fella on 80 SSB this morning about his experiences with a vertical 1/4 wave and a horizontal
On 09/09/2013 10:33 AM, James Rodenkirch wrote: ...think that there's "more to understanding" horizontal and vertical antennas on Top Band. Listening to a fella on 80 SSB this morning about his exper
On 9/9/2013 10:33 AM, James Rodenkirch wrote: Listening to a fella on 80 SSB this morning about his experiences with a vertical 1/4 wave and a horizontal loop on Top Band. He said he had both up and
Since the time span ebbs and recedes, i.e., loop better for a while then the vertical, then the loop. I doubt if those magnetic anomalies enter into the picture. _________________ Topband Reflector
Same here, guys. Please do reply here and if someone "already knows everything," they need not even read the thread, right? LOL. I have heard, but don't know if it is a common mode of propagation or
When you use antenna modeling software to look at a low dipole on 160 you note three things: 1) They are extremely high angle radiators and 2) Raising the height from say 10 feet to say 100 feet has
But then if you overlay the two models you see something very strange. The Total radiation of the horizontal antenna (against normal ground, not sea water) is so much better that its effective radiat
Ashton, thanks. I DO have EZNEC and know how to use it pretty well (that is to say, I have used it to provide what-if results for antennas that are a bit more complex than a simple dipole..... like 4
Hi Mike, As far as the ducting goes, here is some insight into the phenomena in my old CQ article: http://k3bu.us/propagation.htm 160 exhibits peculiarities, depending on sunspot cycle, time of the y
"As an example though, EZNEC shows FS of a vertical as virtually zero at zero degrees. We know that isn't true." And as has been repeated a number of times between myself and Richard Fry, the right t
Agreed. That a vertical monopole 5/8 wavelength and less in height, using a less than perfect ground plane has a certain takeoff angle above the horizon where radiated field is maximum is a very comm
I will preface my question by saying that I haven't worked through a problem like this in 20 years, so it's quite possible that I'm forgetting some obvious details. I'm puzzled by how this surface wa
The radiated field of a vertical monopole present on the surface of lossy earth decays at greater than a 1/R rate. But, for example, the field shown at a horizontal distance of 0.1 km in my surface w
"The radiated field of a vertical monopole present on the surface of lossy earth decays at greater than a 1/R rate. But, for example, the field shown at a horizontal distance of 0.1 km in my surface
Yes. I don't see how field values at a 100m (0.625 lambda) range and 9m (0.05625 lambda) altitude can tell us anything about the far-field behavior. Note that such radiation may be relatively close t
That diagram looks like it is for an isolated dipole in free space. I would be careful about using it in this case. That being said, I am not disagreeing with you. I'm only trying to understand what
Chapter 10 of RADIO ENGINEERS' HANDBOOK (1st Edition) by F. E. Terman has a good discussion of this beginning on page 674, but the page count on the subject is too much to link to here. Hope those in
Author: Anthony Scandurra <anthony.scandurra@gmail.com>
Date: Sun, 15 Sep 2013 17:29:51 -0400
Go to this link: http://www.scribd.com/doc/23847007/Radio-Engineers-Handbook-1943-Terman ...and then type page 686 at the box in the toolbar just above the page display. It takes you to page 674 in t
Thanks for the link. I'm still wondering about NEC and its surface analysis. I will have to find a more complete explanation of what it does. As I said before, it sounded to me like all of the radiat