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| To: | <[email protected]> |
|---|---|
| Subject: | Re: LF: VLF - G3XIZ |
| From: | "James Moritz" <[email protected]> |
| Date: | Fri, 31 Dec 2010 17:45:52 -0000 |
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| In-reply-to: | <[email protected]> |
| References: | <[email protected]><[email protected]><[email protected]><1567AC3A96624647ADC1F52EF1A1E625@JimPC><[email protected]><[email protected]> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
Dear Chris, LF Group,The signal disappeared some time around 1520utc - the complete trace is shown in the attachment. I made an estimate of the field strength of your signal by injecting a test signal at a known EMF into the loop antenna, and comparing with the level of your signal. The received FS at the strongest point (around 1330utc) worked out to be 1.8uV/m. Taking the distance between our locations as 37km, your ERP would have been 87uW. The SNR at best was around 15dB, making the noise level 0.32uV/m in the FFT noise bandwidth of 2.1mHz, or a noise density of 7uV/m per sqrt(Hz) Assuming a 50m vertical wire (heff ~ 25m), Rrad of your antenna at 8.97kHz would be 880micro-ohms. Assuming 2.62dB directivity for an electrically short monopole compared to a dipole, and Iant of 200mA, the calculated value of ERP would then be 64uW. So there is reasonable agreement between these two calculations, the difference only being 1.3dB. Thanks for the tests, Cheers, Jim Moritz73 de M0BMU
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