Hello all, I like to share my experiments and hear from your similar experiments regarding ground conductivity and permittivity measurements. As we all know (should know), those two parameters ar
As we all know (should know), those two parameters are esential to evaluate the ground under our antennas, especially for verticals. The ideea to measure the ground concuctivity and permittivity rise
Excellent work, Cristi. A suggestion for this last part of the analysis. Rather than look at the vertical angle where the radiation peaks, look at the field strength at some chosen low angle, like 10
Excellent work, Cristi. A suggestion for this last part of the analysis. Rather than look at the vertical angle where the radiation peaks, look at the field strength at some chosen low angle, like 10
I don't know about further out where you'd have to proof an AM station but I just ran some models and there's kind of a weird relationship between vertical electric field strength at 1 wavelength ou
I don't know about further out where you'd have to proof an AM station but I just ran some models and there's kind of a weird relationship between vertical electric field strength at 1 wavelength out
Conclusion: The less ground conductivity the higher is the antenna elevation radiation angle. This is a negative impact for DX! Cris, Tom, Paul et al This belief is common when looking at the far-fie
When you do problems like this with modeling, be careful. While the wire moments are specifically calculated segment by segment, what gets calculated around ground is not literal calculation like the
Hi Richard, On your referenced fields graph you caption "Measured vs. Calculated" intensity, but the traces are not differentiated. Which traces on the graph are measured and which are calculated? 73
On your referenced fields graph you caption "Measured vs. Calculated" intensity, but the traces are not differentiated. Which traces on the graph are measured and which are calculated? ______________
To Rich's point, I created a buried field in 4NEC2 using the radial geometry wizard and a vertical wire radiator 40m tall, all wires being of #12. The radial field consists of 64, 0.5 wavelength radi
Hello Tom, My comments are on your message (below). I measured the impedance from 1 to 180MHz continuously with miniVNA. The presented values (27 to 5mS/m) are for 1833kHz so, are not useless. I do
From Terman (as Richard Fry mentioned): http://i62.photobucket.com/albums/h85/rfry-100/TermanFig55.jpg First hop distance on E layer reflection for given angles is: 20 degrees = 300miles, 30 degrees
Cristi, Thank you for the thoughtful answer. If I was of a mind to verify the use of probes, I would look at the attenuation slope of sample signal from a distance source across the area being measur
On 10/3/2012 7:20 AM, Tom W8JI wrote: I would agree with your idea about multiple points making it meaningful if you also moved the probes deep below ground, to a depth where the field diminished to