Hi LF folks,
CORRECTIONS & ADDITIONS to 136 kHz EMRP calculations:
Earlier approximations were wrong, as is usually goes..
We could, at the last moment, arrange a Field strength
measurements of Reinos's OH1TN 136.4 kHz transmission.
Reino was running "full available power" with 100 W out
The "sigma" value used for calculations now is based on
earlier comparisons and measurements made on LF.
Measurements were on 28 October 1999, at full daylight.
The Fs table below is based on estimated EMRP of 300 mW.
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GROUND WAVE FIELD-STRENGTH, MILLINGTON METHOD
OH1TN -> OH2LX (Measuring station), d = 152 km
FIELD-STRENGTH DB ABOVE 1 MICROVOLT/METER
EPS =10.0 SIG = .6 mS/m FREQ = 136.4 kHz POWER = .30 W
DIST. (KM) F-S (DBU)
1.0 74.1
2.0 68.0
3.0 64.4
4.0 61.8
5.0 59.8
6.0 58.1
7.0 56.7
8.0 55.5
9.0 54.4
10.0 53.4
20.0 46.6
30.0 42.3
40.0 38.9
50.0 36.2
60.0 33.5
70.0 31.4
80.0 29.5
90.0 27.8
100.0 26.4
110.0 24.9
120.0 23.5
130.0 22.2
140.0 20.9
150.0 19.7
160.0 18.6
170.0 17.4
180.0 16.4
190.0 15.3
200.0 14.3
210.0 13.3
END OF CIRCUIT
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V.K.Lehtoranta, OH2LX, POBox 50, FIN-05401 Jokela, Finland
------ Tel: +358-9-4173965 ---- Fax: +358-9-4173961 ------
E-mail: [email protected] - alias: [email protected] & [email protected]
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