[Lf] GW F-s versus Wx parametres]

[Andre' Kesteloot]

Väinö Lehtoranta wrote:

> Working on the material left by ex YLE Meas station...
> Does anyone know the email address of C. Gordon Van Aruan
> whose article "Influence of Atmospheric Humidity on
> Low-Frequency Radio Ground Waves" is on the pages 2.5-2.7
> of "the LF Experimenters's Source Book", 2nd Edition.
>
> Let me refer to another article in Proc IRE, April 1948,
> "Temperature Variations of Ground-Wave Signal Intensity
> at Standard Broadcast Frequencies" by Frederick R Gracely:
> ----------
> "Ground-Wave signal intensities at standard broadcast
> frequencies exhibit considerable variation, even over
> short paths. ... The practical result of such variations,
> regardless of the physical explanations ultimately involved,
> is equivalent to changes in the EFFECTIVE CONDUCTIVITY OF
> THE PATH. Therefore, in cases where the consideration of
> close margins in conductivity measurements is necessary,
> the variations produced by changing conditions over the
> path may become exceedingly important. ...
>
> Careful comparisons of signal intensities with many sets
> of data on temperature, precipitation, humidity, atmospheric
> pressure, dew point, and vapor pressure showed clearly that
> there was closer and more continuous correlation with
> TEMPERATURE than any other single type of data."
> -----------
> As we have been making these GW F-s measurements for more
> than 50 years, would like to ask whether other persons on
> this reflector have professional type of experience with
> these F-s variations?      73 de Vaino, OH2LX
>
> ----------------------------------------------------------
> V.K.Lehtoranta, OH2LX, POBox 50, FIN-05401 Jokela, Finland
> ------ Tel: +358-9-4173965 ---- Fax: +358-9-4173961 ------
> E-mail: vaiski at dlc.fi - alias: oh2lx at dlc.fi & oh2lx at sral.fi