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Kjell SM2FOB (ex SM0FOB) QTH BODEN KP05vs SWEDEN - ITU18 WAZ14

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Meat and Blu-ray

November 16, 2010

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Dog Antenna

November 04, 2010

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Practising the Sony NEX-5 camera

October 22, 2010

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Russian space store

October 22, 2010

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The digital camera Sony NEX-5

October 11, 2010

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Morse with Bebot

October 03, 2010

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Antique vacuum tube

September 08, 2010

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SK0QO Field Day

September 08, 2010

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Flight tracks

September 08, 2010

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Weather conditions

September 08, 2010

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100 years since first flight in Sweden

August 23, 2010

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Gotland

August 08, 2010

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Northern events

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Arkiv

2018 1
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    Receiving Japan on 50 MHz

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2009 86
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2008 85
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Popular Posts

Space Antennas

Two weeks ago I did visit the exhibition NASA - A Human Adventure at the Technical Museum in Stockholm, Sweden. An exhibition with not only scale models from space exploration history, but also full scale models that cannot be distinguished from the original ones. As a radio amateur I had special interest in some of the antennas being shown :-) This is the Russian Lunokhod (Moon walker) with is solar panel lid flung open. One antenna half is an ordinary helix UHF antenna, but what is the purpose of the other half? Anyone knows? The Lunar Rover´s umbrella antenna has a black strange object at its back. What is it? Update 6 April, 2011 It is possible to download from NASA the Lunar Rover Operations Handbook . On page 119 there is a drawing explaining that the black object is an optical sight. This is Sputnik 1, the first satellite, weight 83 kg and diameter 58 cm. From Wikpedia I found following information about its antennas. The satellite carr...

Hunting Schumann Resonances

Quote Wikipedia : The Schumann resonances are a set of spectrum peaks in the extremely low frequency portion of the Earth's electromagnetic field spectrum. Schumann resonances are global electromagnetic resonances, excited by lightning discharges in the cavity formed by the Earth's surface and the ionosphere. This global electromagnetic resonance phenomenon is named after physicist Winfried Otto Schumann who predicted it mathematically in 1952. Schumann resonances occur because the space between the surface of the Earth and the conductive ionosphere acts as a closed waveguide . The limited dimensions of the Earth cause this waveguide to act as a resonant cavity for electromagnetic waves . The cavity is naturally excited by electric currents in lightning. Schumann resonances appear as distinct peaks at extremely low frequencies around 7.83 (fundamental), 14.3, 20.8, 27.3 and 33.8 Hz. Observa...

The TRIO HAMCLOCK HC-1

When visiting a flea market in town Boden in northern Sweden yesterday I did not expect to find any ham radio gear. But, there it was. I recognized it instantly. It was a japanese clock from the 70´s and designed for use by radio amateurs and manfactured by TRIO (Kenwood) in 1971. With this clock it is possible to see local time for different country call areas incl. GMT (UTC). The summertime was not invented in 1971 so no summertime with this watch. Nor the quartz clock was invented at that time. It is a fully mechanical watch. The battery winds the mainspring every 8 minutes. Would the clock start after possible 40 years not in use? Yes it did! This clock will definitively remain in my shack. .

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