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Field Strength Meter for the 137 kHz Band: by Dick Rollema, PA0SE

Photos from the Second Russian DX- LFpedition. Asia, village Dovolnoe. Members UA9OC and RU6LA

Field Strength Meter for the 137 kHz Band: by Dick Rollema, PA0SE

The power radiated by an antenna is equal to the radiation resistance multiplied by the antenna current squared. Measurement of antenna current can be done in the 137 kHz band by for instance a thermocouple ammeter or other means.A more reliable way of determining radiated power in the 137 kHz band is by measuring the field strength near the station but outside the near field region. A distance of 1 km is probably sufficient to reduce the influence of the near field on the measurement sufficiently and 2 km is definitely safe.

Photos from the Second Russian DX- LFpedition. Asia, village Dovolnoe. Members UA9OC and RU6LA

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Two Articles in one PDF file, 900 KB (ANTENTOP-02-2003, pp.: 53- 58)

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Field Strength Meter for the 137 kHz Band

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Last Updated:

February 4, 2018 23:06