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| To: | [email protected], [email protected] |
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| Subject: | LF: 136kHz ERP calculation |
| From: | Roger Lapthorn <[email protected]> |
| Date: | Tue, 10 Aug 2010 19:09:45 +0100 |
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My last post didn't appear, so this is a retry... About a week ago I recorded my 136kHz QRP beacon (2W from PA, QRSS3, using just 20m separated earth electrodes as the antenna) at 14.9km away from the QTH using Spectran with a 30t, 80cm loop, Hi-Z matching into the FT817. I'm wondering if someone here is able to work out the ERP that I must be achieving please. These are the numbers I have: Spectran signal level -42.5dB Resolution 0.17Hz Sampling rate 11025 Distance (Rx from TX) 14.9km It surprises me that the signal can be seen so well at this distance with such low power and with this "antenna" set-up. Thanks in advance for any help and please excuse my ignorance. 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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