To: | [email protected] |
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Subject: | Re: LF: AW: Beaconing on 8.79 kHz in QRSS |
From: | Roger Lapthorn <[email protected]> |
Date: | Mon, 22 Feb 2010 10:03:51 +0000 |
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At this frequency, widely spaced, grounded electrode pairs are probably the best "antenna". There are references to how these work in the literature (for example NATO AGAARD papers from the 1960s, available on the internet I believe) and on one of the German ham sites (DK8KW) - see http://www.qru.de/#vlf .
Don't expect great ranges: up to 10kms is a fair aim with modern signal processing technology and reasonable (amateur levels) available power. Project Sanguine achieved worldwide coverage to submarines at 76Hz (yes Hertz!) but used enormous power and antennas stretching for 100s of kms.
73s
Roger G3XBM
2010/2/22 Stefan Schäfer <[email protected]> Hello Horst, -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/G3XBM G3XBM GQRP 1678 ISWL G11088 |
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