To: | [email protected] |
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Subject: | Re: LF: DX with 472 kHz, earth electrode antenna, 25 Watts output :-) |
From: | Piotr Herko <[email protected]> |
Date: | Sat, 20 Sep 2014 10:59:42 +0200 |
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Hi, Tnx Marcus for methodology for EIRP level estimation. I try calculate! Mauro, Earthing connected to shack is from band around my home. Band in about 1,5 meters deep in ground. It is connected to all my equipment. This band is first for safety on home. Electrode is about 20 meters far from nearest point of 'normal' earthing point. Second electrode is simply 2 meters vertical rod pounded in soil. This electrode is directly connected to tx output with 2,2 nF capacitor in serial. For connection I use isolated wire. Capacitance was selected to get lowest SWR. I was using for it home made NWT-7, DK3WX project, simple network analyser. It is simple observe on analyser where is minimum SWR, then change capacitor to get low SWR. But it is no problem use SWR meter for it only. Output from tx is 50 ohm 5th order filter. Isolated wire lay simply on ground. I dont see any significiant changes between wire on ground and hanging on fence. SWR is 1.1 to 1.4 according to weather. I dont know exatly what soil is in my garden! I think it is sandy clay. Piotrek, sp5xsb On Sat, Sep 20, 2014 at 10:00 AM, Markus Vester <[email protected]> wrote:
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