Topband: Short radials?

[Guy Olinger K2AV]

Hi, Richard.

Can you pass along your source of information that BL&E was done over
4 mS/m soil, as that is a matter of dispute among some of us and it
would be excellent to have something authoritative for that. It would
also be good to have authoritative source for the specific location of
the test.   Or are you using the FCC map for typical soil
conductivities and presuming a common New Jersey value and no
variation at the site?

I note in the study that some graphs specify in their keys an mS/m of
2 and other graphs list mS/m of 10.  But the study makes no mention of
how they did that.  It does not seem that they went to two different
sites, as the photographs are of one site.  It is also clearly very
dark dirt. Some pictures have very clear markers for grey scale. Sandy
soil is usually very light in color. The dark suggests a far more
carbonaceous and conductive soil.

Also, the assumption at the time was that ground behaved the same for
low BC as for higher frequencies.  The BL&E tests were made at 3 MHz.
Whether 3 MHz results apply to 1.8 MHz, to what degree, and in what
particulars, is an area of dispute.

73, Guy.

On Thu, Sep 27, 2012 at 1:14 PM, Richard Fry <rfry at adams.net> wrote:
> The measured data linked below shows how the number of buried radials
> affects the performance of monopoles of various height to 90 degrees, for an
> applied power of 1 kW.  Earth conductivity at the test site was about 4
> mS/m.
>
> http://i62.photobucket.com/albums/h85/rfry-100/BLandERadials.gif
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK