On Mon, Dec 17, 2012 at 8:41 PM, Carl <[email protected]> wrote: > > Subject: Re: Topband: Ground mounted 1/2 wave > > ** All that means is that the elevation peak of the wave as seen in the > typical 2D plot increases by .38dB and as expected. It does not say what > happens from that peak down to zero elevation which is what 160M DXers care > about. > What is the FS at 5, 10 degrees when going from a ground rod to a full > bore radial field over a wide range of ground conductivity? > > Carl > KM1H
Yes, it does say what happens from that peak down to zero elevation. It says that the signal increases by 0.38 dB. To test this I ran two EZNEC simulations. One is a 90 degree vertical over thirty 90 degree radials over medium ground. The antenna is driven with 1 kW and the E-field at one mile is recorded from a height of 10' to 1000'. A second 90 degree vertical over four 23 degree radials driven with 1 kW and the E-field at one mile is recorded from a heights of 10' to 1000'. *The difference in E-field AT ALL ELEVATIONS is 0.86 dB*. Dave WX7G > > > > ______________________________**_________________ > It is undesirable to believe a proposition when there is no ground > whatsoever for supposing it is true. — Bertrand Russell > _______________________________________________ It is undesirable to believe a proposition when there is no ground whatsoever for supposing it is true. — Bertrand Russell
