The original postulation from Brian, K6STI, was that connecting the shield of the coax to ground at a point where any common mode current might exist would shunt it to ground. I've claimed that's a f
What you are describing is totally different than the original claim (and the subsequent discussion) that the earth is an RF sink. What was the purpose in doing that? Yes, you can make the earth act
I already answered that. RF isn't DC ... it doesn't just flow to the earth and disappear. It flows back and forth every half cycle. Whatever current flow may occur between the coax and ground is st
Brian, I didn't say there shouldn't be any current. I said there isn't any current that just goes to ground and stays there ... as in bleeding it off. EZNEC doesn't show that either. It just shows
Possibly I missed it, but I don't see your EZNEC model. I only saw the diagram. Can you send me the model? Dave AB7E Dave, I don't know what you mean by back and forth. In my model, the ground wi
The VOR is a very valid concept, and I've modeled it in a couple of different ways to investigate it. I'm even thinking of building an 80m vertical based upon it so I don't have to string wires arou
Exactly so, Jim. I don't know why Zero Five would think that's a good idea. Dave AB7E On 10/28/2025 1:58 PM, Jim Brown wrote: On 10/28/2025 11:15 AM, n1bkb-- via TowerTalk wrote: While I have not
Most of a lifetime ago I was a component engineer at Collins Radio, and one of the products I was responsible for was a small ferrite core. The manufacturer's rep explained the manufacturing process
You respond to a message imploring you to edit the digest subject line by keeping the digest subject line. Dave AB7E On 11/28/2025 10:16 AM, ARTHUR BERNSTEIN via TowerTalk wrote: Well guys, my mind
I can't think of any reason why an antenna would be "quieter" other than it having a tighter pattern, either horizontally or vertically, and therefore discriminates against background noise better.
On top of that, based upon the modeling I've done over the years I've never found that a vertical dipole has any appreciable advantage over a 1/4 wave ground plane. Certainly not enough to justify t
"Assuming you have the height" That's the kicker, though, and it takes twice as much of it for relatively little additional performance. I've modeled a 20m ground plane with four elevated radials an
I know what those are. It's another design from N6BT, who I believe used to own Force 12. As I said in a different post, he also came up with the VOR that coils the bottom half of a vertical dipole
I already explained all of that. Default ground specs were used. (0.005/13 over Real/MININEC) The ground plane antenna had four 1/4 wave horizontal radials 4 feet off the ground. The bottom of the
FFS Jim, I know all about the effect of ground specs on vertical antenna performance and the difference with horizontal polarization. I used the default specs BECAUSE I WAS ONLY MAKING A COMPARISON!
FEKO is supposedly a much more sophisticated modeling application capable of handling complex terrain and even 3D objects like cars (or tanks, for which I assume it was originally designed) and at on
What is say is absolutely true, but in today's world it would be possible to actually quantify some of those things. For real time propagation it is hard to beat PSK Reporter's map of FT8 activity, a
Last year I got interested in the Radio Jove project that monitors broadband RF emissions from Jupiter from about 15 MHz to 25 MHz. For that purpose I built a 5 element wire log periodic antenna and
Hhmmm ... that is a truly interesting idea and I think it could be accomplished without a ton of cost, although not with particularly great resolution. Here's a few thoughts. 1. PSK Reporter can pr
Good point! Dave AB7E In all cases, a small oscillator (crystal controlled or something like the popular Silicon Labs programmable ICs) positioned between the two antennas could provide a reference