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Showing posts with the label 472 kHz WSPR TX/RX with earth electrodes.

472 kHz WSPR TX/RX with earth electrodes. Post 1680.

If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=m_2WMbDjoAw. Antennas for the 630 meter amateur radio band (472 kHz-479 kHz) can be large and difficult to fit into an urban lot.  Would you be willing to use this band if a "reasonably small antenna" could be designed and built for this band? Roger (G3XBM) has been doing experiments with "earth electrodes" at his QTH--his results have been impressive for the small amount of power he's using (around 10mW).  According to Roger, his antenna system consists of 2 ground rods placed 20 meters/65.6 feet apart, with the ground connected to the PA by a wire running about 1.5 meters/4.92 feet above ground along a fence.  Despite the constraints and limited size of this "earth electrode" antenna, the system seems to work, even at low power levels.  A fascinating idea worth trying. For the latest Amateur/Ham Radio news and informati