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| To: | <[email protected]> |
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| Subject: | LF: Re: HB9ASB... SNR of DCF39 |
| From: | "James Moritz" <[email protected]> |
| Date: | Tue, 9 Aug 2011 22:58:30 +0100 |
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Dear Stefan, Minto, LF Group,No TX this evening here, I'm afraid, but I took the opportunity to make rough measurements of the field strengths of G3KEV (12uV/m), DK7FC (1.9uV/m) and HB9ASB (0.7uV/m) - see the attached screen capture. As you can see, these are all "O" copy signals here. KEV is quite a strong audible signal here as usual - DK7FC and HB9ASB look a bit weaker than they actually were - this screenshot was taken with my loop oriented approx. N-S to measure Mal's FS; with the loop oriented E-W Stefan and Toni were both several dB stronger. The QRN level was fairly low here for the time of year, and the band noise was dominated by Loran C with the loop aimed N-S, and sidebands from DCF39 with the loop E-W. Earlier, I repeated PA3BCA's signal-to-noise measurement on DCF39 - The SNR of DCF39 was about 82dB with the 0.5Hz FFT noise bandwidth. My location IO91vr is a bit further from DCF39, so I would expect the SNR in PA to be a few dB higher under similar conditions. The field strength of DCF39 was about 3mV/m (several dB higher than the daytime level I have measured in the past), making the noise floor about 0.24uV/m in 0.5Hz. Cheers, Jim Moritz73 de M0BMU
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