Dallas I looked for a link to models in a quick look at the F12 Web site, but didn't find it -- However, I know others have obtained models for their antennas from the company. Send them an e-mail r
Vince The list is working; it does not have lots of activity, but at least it doesn't have the "noise" level of TowerTalk! I have an ongoing question to all subscribers -- I am trying to get at least
Billy and all While parallel feedlines provide new impedance options, remember that the characteristics of each line do not change -- including loss. If a 75 ohm cable has a loss of 1 dB/100 ft, the
Billy Here's the simplest example I could come up with -- Case 1. 72 ohm matched system, one feedline. 100 watts is delivered to the line, which has losses that we will say are equivalent to 10 ohms
Len A good modeling program would let you explore them before building. I am not presently aware of shareware or freeware programs that are readily used by a beginner. All the commercial programs I'v
Maybe there is someone who can answer this question or refer me to reference material: As ground conductivity gets "worse," is there a point at which losses actually become less -- e.g. acting more l
Jerry, You supplied food for thought, but I'm looking for a simpler answer! My antenna is a long way from the iron core of the earth, so that's not an issue here. And I am only concerned with the nea
Dave Your comments have been very helpful, THANKS! I must admit that part of my reason for asking this question was to get some discussion going on this under-utilized reflector. While I am certainly
Jim Good to hear from you and get your comments. Following my request for information and discussion, I got several interesting e-mails, but few with hard data. There is a dearth of information on sk
Charlie There is no error in your model. The gain of a short-spaced array can be very good, as you have shown. ZL-Special and W8JK antennas are examples of proven short-spaced arrays. Yes, such an ar
I just reviewed the material on LB's site about the ON4ANT antenna -- this is very impressive performance that I will try to find time to pursue further -- Yagi type performance a with Log type struc
Mike The feedpoint impedance of a vertically polarized delta loop will vary with the shape. If it is not too high -- the bottom wire is long and the corner angles are acute -- the impedance may be ne
Chris They don't have detailed specs on theSage website, but here is their contact info -- e-mail info@sagelabs.com Web www.sagelabs.com Good luck! Gary Breed, K9AY -- -- FAQ on WWW: http://www.conte
Tad, Everyone will have a bit different opinon on which antenna modeling program to use. First, be sure to check W4RNL's web site and his recent articles in the various magazines -- That will help yo
Another issue with the "steel and aluminum jungle" is detuning unwanted re-radiating structures. For example, a few years back, I had to somewhat regularly de-tune towers in the vicinity of AM broadc
George First, EZNEC is available from Roy Lewallen, W7EL for $89 -- at PO Box 6658, Beaverton, OR 97007 -- Tel: 503-646-2885 -- email: w7el@teleport.com This program uses the NEC-2 computation engine
Pat The answer is a qualified "No, these data formats are not inherent to NEC or MININEC." The differences you noted are choices (and sometimes compromises) made by the programmer of the NEC or MININ
Hello... Is this thing on? I thought I subscribed to this list months ago but have seen no traffic. Is it just me? Or is it really this quiet? 73, Eric n7CL Eric: Stand by -- I'll post a modeling stu
Fellow antenna modelers: I recently did a small modeling study to help shed some light on the elevated radial discussion. I have chosen to post it here instead of other reflectors, as I think this gr
Patrick A note on some past modeling in this arena... A few months ago, a fellow ham wanted to shunt feed a tower and put up elevated radials in a space too small for 1/4-wave straight radials. I too