Hi all,
We also have been continued playing with measurements
of the OH1TN ground wave field strength weekly, with Reino
having tested almost all reasonable antenna configurations.
These tests seem to have resulted with an improvement
of around 2 dB of GW Fs here, from 18 dBuV/m to 20 dBuV/m.
The stability of GW Fs continues to vary from day to day,
even from hour to hour with some time periods being
hopeless for this accuracy (+-1/2 dB) Rxin measurements.
My physical condx are just and just OK for this, hi...
Best regards to LF gang de Vaino, OH2LX
----------- email dated 22 October 2001: -------------
A short summary of OH1TN signal F-s measurements:
Ground distance = 152 km, but the 'loose' soil
above the base rock = mostly few metres only;
which no doubt affects at least low freq signals.
Daytime ground wave F-s during 2000 & 2001 = 18 dB(uV/m).
No notable changes due to antenna config alterations.
During October 2001 daytime F-s variation up to 5 dB
observed e.g. on 9th & 10th but during most days
variation can be less than 1/2 dB.
The observed absolute Min & Max during evening and nite:
Min = 5 dB(uV/m), Max = 24 dB(uV/m)
The greatest observed variation during the dark hours:
8 dB during less than ten minutes.
My best regards to all Vaino, OH2LX
PS MANY THANKS for the special postcard sent to me
by the LF-group from the Windsor HFC 2001 !!
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