"The ground around here is mostly sandstone, clay, shale and sand. The BOG could run about 270' in a straight line but that doesn't seem long enough even using a pre-amp." The issue for the unpredict
EZNEC 4.0: Options Menu: Power Level. Uncheck "Absolute V,I sources" Initially set "Power level (watts)" to 1 Use a 1 meter long vertical RX antenna, with a meter's distance separating ground and th
http://science.nasa.gov/headlines/y2006/21dec_cycle24.htm?list50675 ...For supposedly being at a solar minimum now, the sun has really not been behaving like past minima...at least the ones I've seen
"...I think we are having a semantic issue here." As if to diminish Tom's correct argument by labeling it? Attention to careful language that does not lend itself to false mental simplifications is i
SM0MDG: >> To decople my my inverted L I was using a RG213 coil made of 18 turns on a 11 cm plastic pipe. Would this arrangement be enough to decouple my top loaded vertical with 2 elevated radials?
"Think of it this way -- the other half of the antenna (the radial system) is very broadband, so only the top half (the radiator) contributes to narrowing the bandwidth. " Unfortunately if one models
The NEC4 model I quoted was for #12 wire (which alas I failed to mention) and was only to demonstrate that the bandwidth issue was not anything inherent about an ideal 1/4 w vertical vs an ideal 1/2
Metal detector. "Does anyone know of a way to find buried radials, short of digging up the backyard? " _______________________________________________ Topband mailing list Topband@contesting.com http
"So in case it's back to inverted Ls (either extended or regular) it would also be nice to have views on the original question. What theoretically and practically appears to give the best results, th
"I love the SP just the way it is, but I think this would be an interesting addition." My sentiment also. Wouldn't change the exchange that much. Since the grid square ends in two numbers just affix
Pat wrote: == I am contemplating the construction of a dual band sloping inverted L for 160 and 80 meters ... I have modeled it in MMANA and am looking for advice... You can see what the design ... h
In the discussion about "benefits" of higher and higher power... Broadcasters are not concerned about reciprocity, e.g. two-way QSO's. An extra 10 db in signal can make use of paths with less reliabi
...Things will get better...unless they get worse! == The spread for 1933 spotless days is very interesting. If 1933 is the pattern for the current cycle, the 08/09 season will be very minimal. Also
The effect of trees is very murky and poorly researched (for cause). They certainly do not respond in the same manner as metal conductors. Some where in the archives of this or the TowerTalk reflect
5 wavelengths away is hardly in the far field, with some degree of common ground between. Even at a mile, one is still talking about ground wave, and to draw small distinctions, one needs a model th
EZNEC 5 is the graphical interface which runs a version of NEC in it. The ham version "shells" NEC2. It will use either a Minninec or Summerfield ground. Both of these have their limitations and got
I am presuming from your description that the tower is being used to support the vertical run of a 160 1/4 wave inverted L. If so, getting the SWR better by removing the connection to radials only pr
Your SWR results suggest that you should not connect the braid to the tower base. The tower's ground rods do little for your ground loss issues under the vertical portion of the antenna. That is affe
-- What I have read here and elsewhere is an urban legend substitution of easy feed-point for performance, where "works well" means SWR instead of far field signal strength. Not all high performing a
Coil stock is still being manufactured new by Barker and Williamson, who I think was making the stuff when I built an amp as a teenager. http://www.bwantennas.com/coils/aduxlex.htm 73, Guy. K2AV ____