The Force 12 "net gain" numbers are not field verified. They are "model values" derived at a specific height (74 feet) and are the maximum gain for the antenna - not an average across the band. In a
Nonsense! Some 30+ years ago W2PV showed that a monobander was a monobander no matter what the element spacing as long as the elements are properly tuned for their place in the array. Gain is a prod
No, on 20 it's still a monobander with a 16 boot boom length. That makes the SteppIR three element yagi nearly identical to the well proven Hy-Gain 203BA *20 Meter Monoband Yagi*. 73, ... Joe, W4TV
I knew a lot of competitive signals from 203BA antennas "in the day." While a lot of people went for the 204BA (24' boom) and 205BA (32' boom), the 16 boot boom 203BA (same boom length as the 3 elem
Absolutely. Over the long term one or two dB will be significant. That's an excellent *joke*. Only a very small portion of the boom length of a log-periodic is active on any one frequency typically
You are correct, the 11 dB F/B on 10 meters is because the reflector to driven element spacing has begun to approach 1/4 wave. That's one reason for the optional fixed parasitic elements on six mete
Yagi element spacing has minimal effect on front to back ratio as long as the element spacing is not extreme (all elements compressed toward one end of the boom) and the elements are *properly tuned
I haven't seen a successful (95% efficient for the total boom length) OWA design that covers 20/15/10 meters much less 20, 17, 15, 12, 10 and six meters. 73, ... Joe, W4TV __________________________
Only because M2 is too lazy to bother. Any controller capable of RS-232 input should have more than enough processor processor power to support point and shoot operation if that feature had been par
Arranging three monoband antennas end to end would violate the 95% efficiency for the total boom length criteria but that was my point from the beginning. Unless one is using tunable elements, the w
Jim, Are you sure it's the controller and not the power supply ("brick")? The original controller had similar reports - usually tracked down to the 33V ("high power") switching supply. I'd suggest ch
The Champion Radio data appears to be the old TIA-222-E data not the newer G version (3 second gust). 73, ... Joe, W4TV _______________________________________________ _______________________________
Dick, If you only need the map, look for "Understanding Rev G" in the "catalog" section of Rohn's web site. I believe there is a link to it from the 25, 45, 55, and 65G sections (at least). The map i
I don't like being the one to say "the emperor has no clothes" but the right thing to do is get a geotechnical engineer to check the soil conditions and design a proper footing that will not settle.
The B&W "folded dipole" antenna is the well known "terminated folded dipole" design and it has significant, documented losses - as much as 6dB or more on many bands. The B&W dipole is a bad idea for
That is demonstrably incorrect as shown by a multitude of analysis. The terminating resistor is in series with the radiating element and results in a minimum loss of 3dB just like any other terminat
Verticals in general (ground plane or vertical dipoles) are inferior to a dipole more than 0.4 wavelength above ground unless they are over a large expanse of salt water - e.g., "verticals on the be
NEC may model the pattern for vertical antennas but not the magnitude. It regularly understates losses in the near field resulting in an overstatement of absolute signal levels in the far field - pa
All *four* elements of a four square are active in all four directions. The two "side" elements are effective the "center" element in a three element in-line (end-fire) phased array with 1-2-1 curren
,,, or put them up with a hinged base and "falling derrick." A good derrick with appropriate guys from the derrick to the mast will keep the mast from doing the "wet noodle" on the way up. 73, ... J