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Icom Communication Receiver IC-R8600

April 12, 2017

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Boden Fortress - A long time secret place in Sweden

During the first world war the secret Boden Fortress was completed with its five very huge forts blasted into mountains surrounding Boden city in northern Sweden. They all were abunded as late as in 1998. The Rödberget fort is now a major tourist attraction in Boden. Björn, SM0YUZ knows a lot of these places and he took me on a guided tour to some of them. Many photos can be seen here (sorry text in Swedish) and here you can read the fascinating story of Boden Fortress. Björn, SM0YUZ standing in front of the huge Stora Åberget fort. The ugly Radiobunkern in Boden Fortress is a historical site as it was from here in 1921 the first public broadcast programmes in Sweden were transmitted. Link to an article in a Swedish newspaper.

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 Mizuho MX-7S QRP SSB/CW transceiver

When visiting ham radio flea markets it happens that I found items that "might be useful somtime". This time in Nykvarn I definitevely found such an item. Little money for a Mizuho MX-7S QRP SSB/CW transceiver was irrestisibly. The transceiver in mint condition was sold by Rolf, SM0LJF. It covers 7.000 7.050 MHz and the output power is 2 W. Rolf has replaced the battery holder with an electronic CW keyer.

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