To: | <[email protected]> |
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Subject: | LF: Re: G3XBM: 500kHz ERP increased by 6dB - WSPR reports please |
From: | "Alan Melia" <[email protected]> |
Date: | Fri, 6 Nov 2009 19:17:42 -0000 |
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Hi Roger there is probably less volts on the vertical section so you are losing less by capacitive coupling to the surroundings too. Well done!! ...but watch the wind it a killer with that format aerial. Alan G3NYK ----- Original Message ----- From: "Roger Lapthorn" <[email protected]> To: <[email protected]> Sent: Friday, November 06, 2009 4:45 PM Subject: LF: G3XBM: 500kHz ERP increased by 6dB - WSPR reports please > Today I modified my 500kHz antenna. The 28MHz halo up at the top of the 5-6m > vertical section (which was the coax feed to the 28MHz halo) was removed and > replaced by a spiral inductance/ top capacity hat consisting of around > around 8 "spiralling in" turns in the space occupied by the original halo. > Seeing my initial reports from M0BMU I am some *5-6dB stronger* than I was > before, I guess because more of the antenna current is in the vertical > section. The measured antenna current is not much different though. > > *Please listen for me on 500kHz WSPR* and let me know if I am now stronger > than before. > > 73s > Roger G3XBM > > -- > ------------------------------------------------------------- > http://g3xbm-qrp.blogspot.com/ > http://www.g3xbm.co.uk > G3XBM GQRP 1678 ISWL G11088 > |
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