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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: 472kHz ERP calculations based on WSPR results |
| From: | Dimitrios Tsifakis <[email protected]> |
| Date: | Tue, 22 Jan 2013 11:47:24 +1100 |
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| Reply-to: | [email protected] |
| Sender: | [email protected] |
2013/1/22 Roger Lapthorn <[email protected]>: > Now, to me these figures seem far too low, so perhaps the noise level is > much higher than 3uV/m or my maths are wrong? The noise floor is variable (over time) and the noise in WSPR S/N is calculated on a 2500 Hz window that may contain all sorts of RF garbage that come and go and will influence the noise calculation. I think WSPR reports are good for relative comparisons between multiple reception reports of the same transmitter at the same receiver. Even then, a plasma TV or a CFL may be turned on or off, and that may affect the S/N reported. 73, Dimitris VK1SV |
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