[Lf] more on swamps and such]

[Andre' Kesteloot]

David Riley wrote:

> The jury is in and the results are printed in FCC tables in the form of
> ground conductivity curves.
>
> Salt Water is 5000 micromhos per meter conductivity and believe me you can
> hear best out on the ocean by far.  Transmit too.
>
> Jungle and treed area is worse case.
>
> Rule of thumb:
>
> If you are on a salt water marsh like WBZ-AM or in Brant Rock where the
> first radio voice broadcast took place in 1906 then a vertical with radials
> is for you.  One way to beat poor soil is to make the radials 'resonant'.
> This you may do by using insulated wire radials slightly shorter than a
> quarter wave and 'loading' while watching RF current in that leg.
>
> If you are on a rock mountain or useless conductivity soil like sand then
> think about using a loop or balanced antenna.  KDKA-AM Pittsburgh uses a
> 'Franklin' which amounts to a center fed half wave up in Allison Park on the
> rocks.  I use full wave loops on 160 and 80 and hav'nt seen a better
> performer in 50 years.  ( more quiet on receive too )
>
> Alas it is true,  I=E/R   evan at A.C.
>
> 73s de Dave - 1A