I have added a couple more phases (5 & 6) to the LPDA design notes. 5 covers some construction thoughts for a prototype. 6 covers the 3-el Yagi I use as a standard against which to measure other desi
I have added a couple of items to the site that may be of use to someone. 1. another phase of the LPDA study, this one (7) on a further investigation into the wide-band Yagi design using open-sleeve
I have received word that UTK.EDU will be out of service from Thursday AM through Monday AM (to replace a floor in the computer center, I have been told). It is unlikely that e-mail will reach me dur
This note will let all know that the utk.edu UNIX system is back on line. It seems to have preserved all 350 messages that arrived while it was down. Added to the site is an old presentation I once m
In answer to some recent questions received on "capacity" hat placement, I have added a note on the subject at my site. The brief answer is--on the end for max electrical efficiency. That is not news
Lee, Raw NEC-2 will give erroneous answers for any linear element using taped diameter. The Leeson equations for calculating substitute elements of a single diameter do not just change the element di
Lee, The process of feeding two antennas with split transmission lines is straightforward. Create a short, thin wire at a considerable distance from the antennas--anywhere from 20-100 wl away. The le
I have uploaded a note at my site with the above title in the little history listings of the index. It is a look at a combination October, 1937, set of articles on small loops. Several folks sent me
I have added some notes on the questions that were left over from the initial part of the study. Hope the material is useful. -73- LB, W4RNL L. B. Cebik, W4RNL /\ /\ * / / / (Off)(423) 974-7215 1434
I have been notifying a number of lists to which I subscribe of notes added to my site, most of which involve modeling studies. The silence on this list has led me not to include it in the notice lis
To all those who asked me to add Antennaware to the distribution of notices on new entries at the site, I appreciate the interest and will be sure to include this list for future notices. There will
Gary, I have read with great interest your researches into the 160 m vertical dipole, sloping GP, and flat GP. What follows are some thoughts that may or may not be of interest or use. First, let's c
I have had several inquiries into other lists. Here is the subscription data as I have it (although changes are possible since I subscribed some time back. Towertalk message to Majordomo@contesting.c
A footnote to Gary's historical notes: The Brown-led investigations were empirically confirmed using the best techniques of the period with a 3 MHz pipe vertical in a field of radials. Some of the te
Traps can be modeled directly if one has access to a value of Q for the coil. Roger Cox of HyGain once published values on one list for the traps they use for 21 and 28 MHz, along with their resonant
As a notebook exercise, I modeled some long Yagis that I have accumulated (45' to 53' booms) for comparison--and came up with some interesting features as well as some cautions about too hastily comp
Note was made of a short boom 12/17 beam. Recently, Force 12 built a special of this sort for someone going into the wilds down under--and the response following the trip was quite positive. do not k
To add to the open-sleeve coupling notes, there is an open sleeve coupled 12-17 design for back-to-back 2-element DE-Dir beams for 12 and 17 at my site under the Upper HF antenna notes. Since the WAR
Horizontal loops (I am assuming you will bring the wires back together at a feed point) make fairly good all-band antennas. Patterns are not especially predictable without a detailed layout--with som
Chris, AO is mininec, and the mininec ground only starts to become reliable at about 0.25 wl up. Hence, your modeling results will be of borderline accuracy. In general, the antenna properties do cha