This didn't seem to happen that much out east (got one from the factory like that once), but then most places we don't have anything like the recurring high winds seen in the west. This trouble or th
Just for clarity, what you described is not a 4-square in the ordinary sense. The current maximum in your conductors is many feet off the ground. (How high was the center of the lazy vee dipoles?) A
I don't introduce another variable in trying to understand why a particular ham gets equal performance out of a lazy V 4 square and a shorty forty. The variables are all there, in action. All that va
Noticed in the 2 element below, I didn't specify which wire was fed. The 47.7 wire takes the power. The 7.4 wire is reflector only. reflector try long,
You might be 4:1 at the antenna as well. You would do considerably better on 18 MHz to just cut an 18 MHz dipole and string it 20 feet up in the air. Signals are quite strong on 17 meters. tower.
Actually NOT. If you model it you will see that the pattern 3 db points on elevation are 15 degrees through 75 degrees with a very broad maximum around 40 degrees. Straight up is a minimum on the pat
Dear Tom, Rant mode on: YES, BUT... The same problem I ran into the last time I tried to chase down VALIDATION of this angle business. The N6BV "STUDY" you quote is a RE-REPRESENTATION OF MODEL DATA.
Many probably don't bother or notice, if the SWR is not killed, many would not care as long as a yagi seemed to have a pattern and took power. And someone can make the case that for much amateur acti
Thank you. Thank you. Thank you. (A big lead to running down some beef, aged though it may be.) I have three big university libraries around here to hassle. University of North Carolina at Chapel Hil
This is just so folks know what the dipole length = 468/f business is about. Note below the wild variation in resonant frequency, impedance, and SWR limits, just by changing height. The formula just
Have to point out that the WinProxy for StarBand is a special variant that at one time at least kept an open port for the folks that run the satellite service, so they could keep the satellite respon
You drill a 3/4 inch hole through the bottom of a Rohn 25 section and you sure don't have much left over. It will just balloon worse when you load it up. Rohn 45 maybe you might get away with this, b
Another gotcha at my place is the long paved driveway with a 56" steel culvert pipe where Reedy Branch goes underneath (official tributary of the Cape Fear River that starts about a half mile away).
Nulls are not caused by "angle of elevation" of the yagi boom. For all practical purposes their angle is fixed by the frequency and height of the antenna. They are caused by the cancellation of waves
Ah, SWR. But then again, what else except SWR. Then there's SWR. How could anything else but SWR matter, after all, it's SWR. SWR trumps performance. SWR trumps efficiency SWR trumps price. ... How c
While you might get into a conversation about why Mosley at all, or why traps at all with newer antennas from any number of manufacturers that either eliminate traps or minimize them, I will stay awa
This is too easy... -- Guy Olinger, K2AV Apex, NC, USA us We have never done much until we got our models to where they predicted what DID happen. A good model is a law of nature that has finally got
Ground being dry or wet underneath has a lot to do with it. Also the acidity of rotting leaves leaching into the ground surface changes its characteristics. This is a seasonal boost that wears away t
There are THREE issues that are improved with ground radials, NOT just one. 1. Reduce ground resistance as a series resistance loss at the feedpoint. Since a shortened radiator has a lower radiation