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| To: | <[email protected]> |
|---|---|
| Subject: | LF: Re: Re: HB9ASB... |
| From: | "James Moritz" <[email protected]> |
| Date: | Thu, 11 Aug 2011 10:39:16 +0100 |
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| Reply-to: | [email protected] |
| Sender: | [email protected] |
Dear Minto, LF Group,I did a similar measurement around 1200utc yesterday with lower daytime noise levels - DCF39 was 870uV/m here, while the noise level was approximately 0.1uV/m in 1Hz. With 0.5Hz FFT noise bandwidth, SNR of DCF39 would be 82dB, same as the night-time value - it seems that at night, ionospheric propagation enhances both DCF39 and noise by the same amount, at least at this QTH. Noise floor measurements I did a few years ago at this QTH in quet winter-time conditions gave a lower value of about 0.07uV/m per sqrt(Hz), very similar to DF6NM's figure. So this would seem to be the limit on the maximum usable sensitivity of a 137kHz receiving system. Cheers, Jim Moritz 73 de M0BMU |
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