Return to KLUBNL.PL main page
| To: | <[email protected]> |
|---|---|
| Subject: | LF: RE: DLF passive received with earth antenna |
| From: | "James Moritz" <[email protected]> |
| Date: | Sat, 17 Jul 2010 22:43:10 +0100 |
| Dkim-signature: | v=1; a=rsa-sha256; c=relaxed/relaxed; d=btopenworld.com; s=s1024; t=1279402987; bh=OKtEl2BqiSztfFTODHn/GZ9JmNDRpEyVvqPDViFYNXQ=; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=HPWqjh9vUDULFTKn1XfjFKDdN+7G2HHNv+wkgorjICouqWRTZJnl84HikSaz3NR04CXCLGFZKMBRBOSRW+MTCiPHn4Z7VJgshEXIezW8mnQX9N4a3j/WkWsphF7YuKUUPL40XfkkXO/Ya9BoM5aKwFfl8qArwR/E3fGkZWyffXY= |
| Domainkey-signature: | a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=DKIM-Signature:Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=qlc7QAnn54O61M7fNSbvRnlqBsxVTEqqFKVyQNQkuyEa0oIAfPW969PnJO/fuE3vrqrPC2xEWzZXmohGrOMEiQLZ8Jy33LGGdEnIoCqfmiDJa0+ubmnuQo4w1Ad7uJMum7i+yiU9YyCngycbqwlvYiio6j1/mb1GcMgn0fyFYmI= ; |
| Domainkey-status: | good (testing) |
| In-reply-to: | <[email protected]> |
| References: | <[email protected]> <[email protected]> <[email protected]> <BF4A524700075746A6467658DFC7102C51094D0E37@ICTS-S-EXC2-CA.luna.kuleuven.be> <[email protected]> <BF4A524700075746A6467658DFC7102C51094D0E44@ICTS-S-EXC2-CA.luna.kuleuven.be> <263121BD51374246B3F184A43B2E9619@JimPC> <BF4A524700075746A6467658DFC7102C51094D0E45@ICTS-S-EXC2-CA.luna.kuleuven.be> <[email protected]> <E21763BAE3DF42FAA9E57979CFC3F5CD@JimPC> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
Dear Stefan, LF Group,It gets confusing when the bandwidth changes! In this case, both measurement bandwidths are much smaller than the modulation bandwidth, and the signal has a continuous spectrum, so it is reasonable to assume the measured signal power will be proportional to the measurement bandwidth. The amplitude of the signal on the earth antenna was -20dB in 3Hz BW. To normalise the measurements to a 3Hz FFT BW, you need to add 6dB to the amplitude of the 1m^2 loop signal in 0.75Hz bandwidth, to give -94dB as you said. The ratio of signal amplitudes is then 74dB, or a factor of about 5000. So the eqiuvalent area of the earth antenna is 5000m^2. Adding Markus' factor of 11dB to give the total signal amplitude from the 1m^2 loop gives -83dB, 74 dB below your reference level of 44mV = -9dB. Therefore the 1m^2 loop EMF is about 9uV, corresponding to FS of DHO38 being about 18mV/m. If this is correct, it corresponds to about 1.1MW ERP, which is impressive, but since the signal is down in the noise in your system, these figures can only be a very rough estimate. Cheers, Jim Moritz 73 de M0BMU----- Original Message ----- From: "Stefan Schäfer" <[email protected]> To: <[email protected]> Sent: Friday, July 16, 2010 11:32 PM Subject: Re: LF: RE: DLF passive received with earth antenna Ehm, 18000m^2? I have just calculated 5000m^2. It is A = 1m^2 * 10EXP((-94--20)/20), right?73, Stefan |
| Previous by Date: | LF: RE: RE: RE: RE: RE: G7NKS txing CW QRSS3 137.7, Dave G3WCB |
|---|---|
| Next by Date: | LF: G7NKS 137.7 QRSS now QRT but still running WSPR, James Cowburn |
| Previous by Thread: | Re: LF: RE: DLF passive received with earth antenna, Stefan Schäfer |
| Next by Thread: | VLF: RE: DLF passive received with earth antenna, Markus Vester |
| Indexes: | [Date] [Thread] [Top] [All Lists] |