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

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Berta Hansson - A retrospective exhibition with her work of art

February 09, 2010

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EchoLink for iPhone/iPod Touch

February 08, 2010

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Winter walk in Stockholm

February 08, 2010

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Birding in the city center of Stockholm

January 24, 2010

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QSLing

January 23, 2010

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iCluster

January 23, 2010

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3D Sun

January 23, 2010

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A QRP SDR Radio from Flex Radio Systems

January 17, 2010

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Frost

January 17, 2010

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Café CQ

January 17, 2010

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Birding check lists

January 17, 2010

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The Morph concept by Nokia

January 11, 2010

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Sky Flambé

January 10, 2010

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Arkiv

2018 1
- June 1
  - Jun 22 1
    
    Receiving Japan on 50 MHz

2017 26
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2015 8
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2014 5
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2013 6
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2012 18
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2011 22
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2010 68
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2009 86
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2008 85
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- March 27
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Popular Posts

DXing with JTDX on 50 MHz

DXing with JTDX on 50 MHz - Kjell SM2FOB RX Icom IC-7300, ANT Broadband Scanner Antenna, QTH Boden KP05vs June 5 2017 - ODX OE5OLL JN68si 1,995 km June 6 2017 - ODX EA8DBM Canary Islands 4,931 km June 6 2017

ROS - A new digital mode

ROS, developed by José Albert Nieto Ros, is a new digital mode under test. Using spread spectrum and 1 or 16 Baud signalling rates it is designed to cope with disturbancies, low level signals, meteor scatter and moon bounce says José. He claims that receiving signals down to -35 dB (!) with 1 Bd signalling rate and -30 dB (!) with 16 Bd are possible. Today I tested 16 Bd reception on 14.1011 MHz. My set-up is shown above with the PC microphone close to a Yaesu FT-857D. This PC screen dump shows that I did receive PA0JMK in The Netherlands calling YU1RP in Yugoslavia. Unfortunately the vertical screen resolution of my mini-PC is not large enough to show the waterfall part of the ROS GUI. ROS home page from where you can download the software, instructions etc. is here and a video is here . The ROS mode has caused som stir as it occupies a large bandwidth of 2.2 kHz in the HF bands. The mode has become forbidden to use in the U.S. because of the spre...

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...

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