Is there a companion wireless ground to provide a connection to the main station ground point? Keep clam, Terry N6RY _______________________________________________ __________________________________
EZNEC+ gives 69.1 ohms over average ground (Real/High Accuracy) at 3.6 MHz. It's resonant with each leg 66.65 feet long (bare #12 copper, 66 segments per leg). It depends on the line length. Pick a m
I put your 40m inverted vee and the adjacent 80m inverted vee into EZNEC (as I understand your layout), and as others have suggested, the 80m antenna does BAD things to the impedance of the 40m anten
As others have mentioned, the patterns on 80m and up will be quite "interesting". On 80m it will perform much like a low dipole, with some nulling off the ends of the horizontal wire and lots of high
This should have a fairly omni pattern on 160, 80, 40, & 20m with good low angle signals. On 30m, 17m, 15m, 12m, and 10m, where you don't have a 1/4 wavelength conductor, the longest wires are NOT de
Dave, You need to so a simple analysis of the free space losses for the two paths (repeater-to-passive, passive-to-mobile). When you add those losses, and offset them with the antenna gain, it's very
As Ben indicated, multiple antennas with any significant spacing will generate a multi-lobed pattern with lots of nulls. This will be the case with or without reflections from the water tank. Even th
Looks a lot like a Butternut HF-9. http://www.bencher.com/hf9vx.html 73, Terry N6RY _______________________________________________ _______________________________________________ TowerTalk mailing l
Eugene, In addition to the excellent comments you have already received, it is worth noting that the 80 meter trap will only "disconnect" the extra wire on 80m, so operation on 60m and up will be imp
A series-section matching arrangement would work well to match to 79 ohms at 10.125 MHz. Connect 4.83 feet of 50 ohm line to the feedpoint (VF=0.66) Then follow with 5.99 feet of 75 ohm line (VF=0.66
This doesn't relate to the original question about inductor forms (see link at end), but matching 12 ohms is quite easy with a simple "hairpin" match. It just requires that the antenna (including any
With 1500 watts to Dan's 40 foot vertical on 160m (assuming 10 ohm equivalent ground resistance), the voltage across the loading coil would be about 9.5 kV rms. That drops to only 2.5 kV rms at the 1
That seems pretty short. Even using the standard formula for a quarter-wave vertical, 234/f, you would get about 128 feet at 1.83 MHz. Generally, inverted L's require a bit more wire than a straight
I've followed with interest the discussion about phased arrays of K9AYs vs. 4 squares, such as the DX Engineering receiving array. I decided to model a few variations, and they back up K4SAV's & NI1N
All the models I have of a K9AY (either delta or rectangle/square), EWE, and Flag have response at the zenith due to the current flowing in the horizontal wires (or the horizontal component of the cu
These work great. When I worked in Seattle, my boss, N6NR, put up two of them at right angles to each other. They were cut for 20m. He wrote an article in QST for March 1993, page 22: "The NRY, A Sim
Not off topic at all! Check out http://www.cebik.com/wire/hsyg.html and http://www.cebik.com/ao/ao11.html 73, Terry N6RY _______________________________________________ ______________________________
I've never seen a large (~1 wl) "shielded" loop in use, although I'm sure it's been done. The shield of the hardline in this case IS the antenna and NOT an electrostatic shield (despite widespread fo
Did it look like any of these? http://www.antenna.be/tci-503.pdf http://www.antenna.be/tci-50713.pdf http://www.antenna.be/lpv.html At one time, KGEI had a vertically polarized log periodic at their
Are the radials elevated? How long are they? What is the diameter of the vertical? Is the ground level? Are there nearby trees, houses, antennas, etc.? 73, Terry N6RY ________________________________