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| To: | [email protected] |
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| Subject: | LF: G3XBM's ERP on 500kHz |
| From: | Roger Lapthorn <[email protected]> |
| Date: | Sat, 23 Jan 2010 13:02:42 +0000 |
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All, Yesterday I did a recalculation of the G3XBM ERP based on the classic formula and re-measurements of my antenna current. My antenna is a 5m long vertical with a spiral top hat of about 7 turns about 1.5m x 1.5m. Not being clear how to model the top hat I assumed effective heights of 5, 4 or 3m. The measured antenna current is 0.12A. My results are as follows: Assumed effective height 5m ERP = 1.53mW Assumed effective height 4m ERP = 0.98mW Assumed effective height 3m ERP = 0.55mW So, I believe my 1mW ERP previously calculated is not a bad estimate, and it may indeed be lower than this figure. 73s Roger G3XBM -- 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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