Hi all,
I found from my archives an old report about
flight measurements of Swedish Decca's dated
in May 1970. A DC-3 was used for measurements.
*MARKENS KONDUKTIVITET BESTÄMD MED HJÄLP AV
FÄLTSTYRKEMÄTNINGAR INOM LÅNVÅGSOMRÅDET*
(translated as):
Ground conductivity determined from Field
strength measurements of Long wave stations
*FOA 3 rapport, A 3743-60, Maj 1970*
There is a map showing calculated effective
conductivity for more than 25 radials, with
Sigma values varying between 0.24 to 0.60 mS/m.
Decca frequencies cover roughly 84...128 kHz.
Swedish report also gives estimated EMRP values
derived from flight measurements and they vary
from 400±100 W for Kallax Green (127.4) to as
low as 24±5 W for Årjäng Purple (71.5).
Note: Swedish Decca's went qrt on 31 Dec 1999.
73 de Vaino, OH2LX
PS Our measurements correlate well with these
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V.K.Lehtoranta, OH2LX, POBox 50, FIN-05401 Jokela, Finland
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