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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

 

 

 

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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

 

 

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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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Contents for AntenTop 02- 2003

 

Field Strength Meter for the 137 kHz Band

 

 

 

 

Lightning Links to Open Book
Antenna Theory Helical Antennas Useful Pieces Simple Keys
Antenna Practice TV Antennas Propagation QRO HF Tube Amplifiers
136 kHz- Antennas Coaxial cables LDE QRO HF Transistor Amplifiers
HF- Antennas Two wire lines Interferences QRP
HF- RX Antennas Feeder's Toolkit Filters TVI/RFI QRP PA
50- MHz Antennas HF ATU Homebrew Receivers Radio and Ham History
VHF- Antennas ATU for the 6- meters Homebrew Transmitters Old Russian/USSR Radio Equipment
UHF -Antennas Antenna Parts Matching Circuit for P.A Amateurs Awards
EH- Antennas Antenna Towers QRP Transceivers Free Radio and Electronics e- Books
TV Channels and Frequencies Reception of Weather Stations Useful Data FM Radio Channels and Frequencies
MagLoop Antennas Home-Brew Technics in Antenna Tools PSU for Amateur Radio from Computer Free Programme and Utility

 

 

 

 

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Last Updated:

December 24, 2016 20:25